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32-bit ARM-BasedMicrocontrollers
SAM D21E / SAM D21G / SAM D21J
Introduction
The SAM D21 is a series of low-power microcontrollers using the 32-bit ARM Cortex-M0+ processor,and ranging from 32- to 64-pins with up to 256KB Flash and 32KB of SRAM. The SAM D21 operate at amaximum frequency of 48MHz and reach 2.46 CoreMark/MHz. They are designed for simple andintuitive migration with identical peripheral modules, hex compatible code, identical linear address mapand pin compatible migration paths between all devices in the product series. All devices includeintelligent and flexible peripherals, Event System for inter-peripheral signaling, and support for capacitivetouch button, slider and wheel user interfaces.
Features
Processor ARM Cortex-M0+ CPU running at up to 48MHz
Single-cycle hardware multiplier Micro Trace Buffer (MTB)
Memories 32/64/128/256KB in-system self-programmable Flash 4/8/16/32KB SRAM Memory
System Power-on reset (POR) and brown-out detection (BOD) Internal and external clock options with 48MHz Digital Frequency Locked Loop (DFLL48M)
and 48MHz to 96MHz Fractional Digital Phase Locked Loop (FDPLL96M) External Interrupt Controller (EIC) 16 external interrupts One non-maskable interrupt Two-pin Serial Wire Debug (SWD) programming, test and debugging interface
Low Power Idle and standby sleep modes SleepWalking peripherals
Peripherals 12-channel Direct Memory Access Controller (DMAC) 12-channel Event System Up to five 16-bit Timer/Counters (TC), configurable as either:
One 16-bit TC with two compare/capture channels One 8-bit TC with two compare/capture channels One 32-bit TC with two compare/capture channels, by using two TCs
Three 24-bit Timer/Counters for Control (TCC), with extended functions:
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Up to four compare channels with optional complementary output Generation of synchronized pulse width modulation (PWM) pattern across port pins Deterministic fault protection, fast decay and configurable dead-time between
complementary output Dithering that increase resolution with up to 5 bit and reduce quantization error
32-bit Real Time Counter (RTC) with clock/calendar function Watchdog Timer (WDT) CRC-32 generator One full-speed (12Mbps) Universal Serial Bus (USB) 2.0 interface
Embedded host and device function Eight endpoints
Up to six Serial Communication Interfaces (SERCOM), each configurable to operate as either: USART with full-duplex and single-wire half-duplex configuration I2C up to 3.4MHz SPI LIN slave
One two-channel Inter-IC Sound (I2S) interface One 12-bit, 350ksps Analog-to-Digital Converter (ADC) with up to 20 channels
Differential and single-ended input 1/2x to 16x programmable gain stage Automatic offset and gain error compensation Oversampling and decimation in hardware to support 13-, 14-, 15- or 16-bit resolution
10-bit, 350ksps Digital-to-Analog Converter (DAC) Two Analog Comparators (AC) with window compare function Peripheral Touch Controller (PTC)
256-Channel capacitive touch and proximity sensing I/O
Up to 52 programmable I/O pins Drop in compatible with SAM D20 Packages
64-pin TQFP, QFN, UFBGA 48-pin TQFP, QFN, WLCSP 32-pin TQFP, QFN, WLCSP
Operating Voltage 1.62V 3.63V
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Table of Contents
Introduction......................................................................................................................1
Features.......................................................................................................................... 1
1. Description...............................................................................................................12
2. Configuration Summary...........................................................................................13
3. Ordering Information................................................................................................153.1. SAM D21E..................................................................................................................................153.2. SAM D21G................................................................................................................................. 183.3. SAM D21J.................................................................................................................................. 203.4. Device Identification................................................................................................................... 22
4. Block Diagram......................................................................................................... 24
5. Pinout...................................................................................................................... 255.1. SAM D21J.................................................................................................................................. 255.2. SAM D21G................................................................................................................................. 275.3. SAM D21E..................................................................................................................................29
6. Signal Descriptions List........................................................................................... 31
7. I/O Multiplexing and Considerations........................................................................337.1. Multiplexed Signals.................................................................................................................... 337.2. Other Functions..........................................................................................................................35
8. Power Supply and Start-Up Considerations............................................................ 388.1. Power Domain Overview............................................................................................................388.2. Power Supply Considerations.................................................................................................... 388.3. Power-Up................................................................................................................................... 408.4. Power-On Reset and Brown-Out Detector.................................................................................40
9. Product Mapping..................................................................................................... 42
10. Memories.................................................................................................................4310.1. Embedded Memories................................................................................................................. 4310.2. Physical Memory Map................................................................................................................4310.3. NVM Calibration and Auxiliary Space........................................................................................ 44
11. Processor And Architecture.....................................................................................4811.1. Cortex M0+ Processor............................................................................................................... 4811.2. Nested Vector Interrupt Controller..............................................................................................4911.3. Micro Trace Buffer......................................................................................................................5111.4. High-Speed Bus System............................................................................................................ 5211.5. AHB-APB Bridge........................................................................................................................ 54
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11.6. PAC - Peripheral Access Controller........................................................................................... 55
12. Peripherals Configuration Summary........................................................................67
13. DSU - Device Service Unit...................................................................................... 6913.1. Overview.................................................................................................................................... 6913.2. Features..................................................................................................................................... 6913.3. Block Diagram............................................................................................................................7013.4. Signal Description...................................................................................................................... 7013.5. Product Dependencies...............................................................................................................7013.6. Debug Operation........................................................................................................................7113.7. Chip Erase..................................................................................................................................7313.8. Programming..............................................................................................................................7313.9. Intellectual Property Protection.................................................................................................. 7413.10. Device Identification...................................................................................................................7513.11. Functional Description................................................................................................................7613.12. Register Summary..................................................................................................................... 8213.13. Register Description...................................................................................................................84
14. Clock System.........................................................................................................10014.1. Clock Distribution..................................................................................................................... 10014.2. Synchronous and Asynchronous Clocks..................................................................................10114.3. Register Synchronization......................................................................................................... 10114.4. Enabling a Peripheral...............................................................................................................10614.5. Disabling a Peripheral.............................................................................................................. 10614.6. On-demand, Clock Requests................................................................................................... 10614.7. Power Consumption vs. Speed................................................................................................10714.8. Clocks after Reset....................................................................................................................107
15. GCLK - Generic Clock Controller.......................................................................... 10815.1. Overview.................................................................................................................................. 10815.2. Features................................................................................................................................... 10815.3. Block Diagram..........................................................................................................................10815.4. Signal Description.................................................................................................................... 10915.5. Product Dependencies.............................................................................................................10915.6. Functional Description.............................................................................................................. 11015.7. Register Summary....................................................................................................................11515.8. Register Description................................................................................................................. 116
16. PM Power Manager............................................................................................12716.1. Overview.................................................................................................................................. 12716.2. Features................................................................................................................................... 12716.3. Block Diagram..........................................................................................................................12816.4. Signal Description.................................................................................................................... 12816.5. Product Dependencies.............................................................................................................12816.6. Functional Description..............................................................................................................13016.7. Register Summary....................................................................................................................13716.8. Register Description.................................................................................................................137
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17. SYSCTRL System Controller............................................................................. 15017.1. Overview.................................................................................................................................. 15017.2. Features................................................................................................................................... 15017.3. Block Diagram..........................................................................................................................15217.4. Signal Description.................................................................................................................... 15217.5. Product Dependencies.............................................................................................................15217.6. Functional Description..............................................................................................................15417.7. Register Summary....................................................................................................................17017.8. Register Description.................................................................................................................172
18. WDT Watchdog Timer........................................................................................ 20518.1. Overview.................................................................................................................................. 20518.2. Features................................................................................................................................... 20518.3. Block Diagram..........................................................................................................................20618.4. Signal Description.................................................................................................................... 20618.5. Product Dependencies.............................................................................................................20618.6. Functional Description..............................................................................................................20718.7. Register Summary....................................................................................................................21218.8. Register Description.................................................................................................................212
19. RTC Real-Time Counter.....................................................................................21819.1. Overview.................................................................................................................................. 21819.2. Features................................................................................................................................... 21819.3. Block Diagram..........................................................................................................................21919.4. Signal Description.................................................................................................................... 21919.5. Product Dependencies.............................................................................................................21919.6. Functional Description..............................................................................................................22119.7. Register Summary....................................................................................................................22619.8. Register Description.................................................................................................................229
20. DMAC Direct Memory Access Controller........................................................... 25220.1. Overview.................................................................................................................................. 25220.2. Features................................................................................................................................... 25220.3. Block Diagram..........................................................................................................................25420.4. Signal Description.................................................................................................................... 25420.5. Product Dependencies.............................................................................................................25420.6. Functional Description..............................................................................................................25520.7. Register Summary....................................................................................................................27520.8. Register Description.................................................................................................................27620.9. Register Summary - SRAM......................................................................................................29920.10. Register Description - SRAM................................................................................................... 299
21. EIC External Interrupt Controller........................................................................ 30521.1. Overview.................................................................................................................................. 30521.2. Features................................................................................................................................... 30521.3. Block Diagram..........................................................................................................................30521.4. Signal Description.................................................................................................................... 30621.5. Product Dependencies.............................................................................................................306
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21.6. Functional Description..............................................................................................................30721.7. Register Summary....................................................................................................................31121.8. Register Description.................................................................................................................312
22. NVMCTRL Non-Volatile Memory Controller....................................................... 32022.1. Overview.................................................................................................................................. 32022.2. Features................................................................................................................................... 32022.3. Block Diagram..........................................................................................................................32022.4. Signal Description.................................................................................................................... 32122.5. Product Dependencies.............................................................................................................32122.6. Functional Description..............................................................................................................32222.7. Register Summary....................................................................................................................32922.8. Register Description.................................................................................................................329
23. PORT - I/O Pin Controller......................................................................................33923.1. Overview.................................................................................................................................. 33923.2. Features................................................................................................................................... 33923.3. Block Diagram..........................................................................................................................34023.4. Signal Description.................................................................................................................... 34023.5. Product Dependencies.............................................................................................................34023.6. Functional Description..............................................................................................................34223.7. Register Summary....................................................................................................................34823.8. Register Description.................................................................................................................350
24. EVSYS Event System........................................................................................ 36324.1. Overview.................................................................................................................................. 36324.2. Features................................................................................................................................... 36324.3. Block Diagram..........................................................................................................................36324.4. Signal Description.................................................................................................................... 36424.5. Product Dependencies.............................................................................................................36424.6. Functional Description..............................................................................................................36524.7. Register Summary....................................................................................................................37024.8. Register Description.................................................................................................................370
25. SERCOM Serial Communication Interface.........................................................38225.1. Overview.................................................................................................................................. 38225.2. Features................................................................................................................................... 38225.3. Block Diagram..........................................................................................................................38325.4. Signal Description.................................................................................................................... 38325.5. Product Dependencies.............................................................................................................38325.6. Functional Description..............................................................................................................385
26. SERCOM USART SERCOM Universal Synchronous and Asynchronous Receiverand Transmitter......................................................................................................39126.1. Overview.................................................................................................................................. 39126.2. USART Features...................................................................................................................... 39126.3. Block Diagram..........................................................................................................................39226.4. Signal Description.................................................................................................................... 392
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26.5. Product Dependencies.............................................................................................................39226.6. Functional Description..............................................................................................................39426.7. Register Summary....................................................................................................................40626.8. Register Description.................................................................................................................406
27. SERCOM SPI SERCOM Serial Peripheral Interface..........................................42327.1. Overview.................................................................................................................................. 42327.2. Features................................................................................................................................... 42327.3. Block Diagram..........................................................................................................................42427.4. Signal Description.................................................................................................................... 42427.5. Product Dependencies.............................................................................................................42427.6. Functional Description..............................................................................................................42627.7. Register Summary....................................................................................................................43527.8. Register Description.................................................................................................................436
28. SERCOM I2C SERCOM Inter-Integrated Circuit................................................ 44928.1. Overview.................................................................................................................................. 44928.2. Features................................................................................................................................... 44928.3. Block Diagram..........................................................................................................................45028.4. Signal Description.................................................................................................................... 45028.5. Product Dependencies.............................................................................................................45028.6. Functional Description..............................................................................................................45228.7. Register Summary - I2C Slave.................................................................................................47128.8. Register Description - I2C Slave...............................................................................................47128.9. Register Summary - I2C Master...............................................................................................48528.10. Register Description - I2C Master............................................................................................ 486
29. I2S - Inter-IC Sound Controller..............................................................................50129.1. Overview.................................................................................................................................. 50129.2. Features................................................................................................................................... 50129.3. Block Diagram..........................................................................................................................50229.4. Signal Description.................................................................................................................... 50329.5. Product Dependencies.............................................................................................................50329.6. Functional Description..............................................................................................................50529.7. I2S Application Examples......................................................................................................... 51629.8. Register Summary....................................................................................................................51929.9. Register Description.................................................................................................................520
30. TC Timer/Counter...............................................................................................53330.1. Overview.................................................................................................................................. 53330.2. Features................................................................................................................................... 53330.3. Block Diagram..........................................................................................................................53430.4. Signal Description.................................................................................................................... 53430.5. Product Dependencies.............................................................................................................53530.6. Functional Description..............................................................................................................53630.7. Register Summary....................................................................................................................54830.8. Register Description.................................................................................................................550
31. TCC Timer/Counter for Control Applications...................................................... 565
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31.1. Overview.................................................................................................................................. 56531.2. Features................................................................................................................................... 56531.3. Block Diagram..........................................................................................................................56631.4. Signal Description.................................................................................................................... 56631.5. Product Dependencies.............................................................................................................56731.6. Functional Description..............................................................................................................56831.7. Register Summary....................................................................................................................60131.8. Register Description.................................................................................................................603
32. USB Universal Serial Bus...................................................................................63832.1. Overview.................................................................................................................................. 63832.2. Features................................................................................................................................... 63832.3. USB Block Diagram..................................................................................................................63932.4. Signal Description.................................................................................................................... 63932.5. Product Dependencies.............................................................................................................63932.6. Functional Description..............................................................................................................64132.7. Register Summary....................................................................................................................65932.8. Register Description.................................................................................................................663
33. ADC Analog-to-Digital Converter........................................................................71433.1. Overview.................................................................................................................................. 71433.2. Features................................................................................................................................... 71433.3. Block Diagram..........................................................................................................................71533.4. Signal Description.................................................................................................................... 71533.5. Product Dependencies.............................................................................................................71633.6. Functional Description..............................................................................................................71733.7. Register Summary....................................................................................................................72633.8. Register Description.................................................................................................................727
34. AC Analog Comparators.....................................................................................74434.1. Overview.................................................................................................................................. 74434.2. Features................................................................................................................................... 74434.3. Block Diagram..........................................................................................................................74534.4. Signal Description.................................................................................................................... 74534.5. Product Dependencies.............................................................................................................74534.6. Functional Description..............................................................................................................74734.7. Register Summary....................................................................................................................75734.8. Register Description.................................................................................................................757
35. DAC Digital-to-Analog Converter........................................................................76835.1. Overview.................................................................................................................................. 76835.2. Features................................................................................................................................... 76835.3. Block Diagram..........................................................................................................................76835.4. Signal Description.................................................................................................................... 76835.5. Product Dependencies.............................................................................................................76835.6. Functional Description..............................................................................................................77035.7. Register Summary....................................................................................................................77435.8. Register Description.................................................................................................................774
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36. PTC - Peripheral Touch Controller.........................................................................78136.1. Overview.................................................................................................................................. 78136.2. Features................................................................................................................................... 78136.3. Block Diagram..........................................................................................................................78236.4. Signal Description.................................................................................................................... 78336.5. Product Dependencies.............................................................................................................78336.6. Functional Description..............................................................................................................784
37. Electrical Characteristics....................................................................................... 78637.1. Disclaimer.................................................................................................................................78637.2. Absolute Maximum Ratings......................................................................................................78637.3. General Operating Ratings.......................................................................................................78637.4. Supply Characteristics..............................................................................................................78737.5. Maximum Clock Frequencies...................................................................................................78837.6. Power Consumption.................................................................................................................78937.7. Peripheral Power Consumption................................................................................................79537.8. I/O Pin Characteristics..............................................................................................................79837.9. Injection Current.......................................................................................................................80037.10. Analog Characteristics............................................................................................................. 80137.11. NVM Characteristics.................................................................................................................81637.12. Oscillators Characteristics........................................................................................................81737.13. PTC Typical Characteristics.....................................................................................................82537.14. USB Characteristics.................................................................................................................83137.15. Timing Characteristics..............................................................................................................832
38. Packaging Information...........................................................................................84238.1. Thermal Considerations........................................................................................................... 84238.2. Package Drawings................................................................................................................... 84338.3. Soldering Profile.......................................................................................................................854
39. Schematic Checklist.............................................................................................. 85539.1. Introduction...............................................................................................................................85539.2. Power Supply........................................................................................................................... 85539.3. External Analog Reference Connections................................................................................. 85639.4. External Reset Circuit...............................................................................................................85839.5. Clocks and Crystal Oscillators..................................................................................................85939.6. Unused or Unconnected Pins...................................................................................................86239.7. Programming and Debug Ports................................................................................................86239.8. USB Interface...........................................................................................................................865
40. Errata.....................................................................................................................86740.1. Device Variant A.......................................................................................................................86740.2. Device Variant B.......................................................................................................................90040.3. Device Variant C.......................................................................................................................908
41. Conventions...........................................................................................................91241.1. Numerical Notation...................................................................................................................91241.2. Memory Size and Type.............................................................................................................912
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41.3. Frequency and Time.................................................................................................................91241.4. Registers and Bits.................................................................................................................... 913
42. Acronyms and Abbreviations.................................................................................914
43. Datasheet Revision History................................................................................... 91743.1. Rev. A 01/2017......................................................................................................................91743.2. Rev. O 12/2016..................................................................................................................... 91743.3. Rev. N 10/2016......................................................................................................................91843.4. Rev. M 09/2016..................................................................................................................... 91843.5. Rev. L 09/2016...................................................................................................................... 91843.6. Rev. K 09/2016......................................................................................................................91943.7. Rev. J 07/2016...................................................................................................................... 92043.8. Rev. I 03/2016....................................................................................................................... 92043.9. Rev. H 01/2016......................................................................................................................92143.10. Rev. G 09/2015..................................................................................................................... 92243.11. Rev. F 07/2015...................................................................................................................... 92343.12. Rev. E 02/2015......................................................................................................................92443.13. Rev. D 09/2014..................................................................................................................... 92543.14. Rev. C 07/2014..................................................................................................................... 92643.15. Rev. B 07/2014......................................................................................................................92643.16. Rev. A - 02/2014...................................................................................................................... 932
44. Appendix A. Electrical Characteristics at 125C....................................................93344.1. Disclaimer.................................................................................................................................93344.2. Absolute Maximum Ratings......................................................................................................93344.3. General Operating Ratings.......................................................................................................93444.4. Maximum Clock Frequencies...................................................................................................93444.5. Power Consumption.................................................................................................................93744.6. Analog Characteristics............................................................................................................. 94144.7. NVM Characteristics.................................................................................................................95344.8. Oscillators Characteristics........................................................................................................95444.9. Timing Characteristics..............................................................................................................963
The Microchip Web Site.............................................................................................. 968
Customer Change Notification Service........................................................................968
Customer Support....................................................................................................... 968
Product Identification System......................................................................................968
Microchip Devices Code Protection Feature............................................................... 969
Legal Notice.................................................................................................................970
Trademarks................................................................................................................. 970
Quality Management System Certified by DNV...........................................................971
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Worldwide Sales and Service......................................................................................972
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1. DescriptionThe SAM D21 is a series of low-power microcontrollers using the 32-bit ARM Cortex-M0+ processor,and ranging from 32- to 64-pins with up to 256KB Flash and 32KB of SRAM. The SAM D21 operate at amaximum frequency of 48MHz and reach 2.46 CoreMark/MHz. They are designed for simple and intuitivemigration with identical peripheral modules, hex compatible code, identical linear address map and pincompatible migration paths between all devices in the product series. All devices include intelligent andflexible peripherals, Event System for inter-peripheral signaling, and support for capacitive touch button,slider and wheel user interfaces.
The SAM D21 provide the following features: In-system programmable Flash, twelve-channel directmemory access (DMA) controller, 12 channel Event System, programmable interrupt controller, up to 52programmable I/O pins, 32-bit real-time clock and calendar, up to five 16-bit Timer/Counters (TC) andthree 24-bit Timer/Counters for Control (TCC), where each TC can be configured to perform frequencyand waveform generation, accurate program execution timing or input capture with time and frequencymeasurement of digital signals. The TCs can operate in 8- or 16-bit mode, selected TCs can be cascadedto form a 32-bit TC, and three timer/counters have extended functions optimized for motor, lighting andother control applications. The series provide one full-speed USB 2.0 embedded host and deviceinterface; up to six Serial Communication Modules (SERCOM) that each can be configured to act as anUSART, UART, SPI, I2C up to 3.4MHz, SMBus, PMBus, and LIN slave; two-channel I2S interface; up totwenty-channel 350ksps 12-bit ADC with programmable gain and optional oversampling and decimationsupporting up to 16-bit resolution, one 10-bit 350ksps DAC, two analog comparators with window mode,Peripheral Touch Controller supporting up to 256 buttons, sliders, wheels and proximity sensing;programmable Watchdog Timer, brown-out detector and power-on reset and two-pin Serial Wire Debug(SWD) program and debug interface.
All devices have accurate and low-power external and internal oscillators. All oscillators can be used as asource for the system clock. Different clock domains can be independently configured to run at differentfrequencies, enabling power saving by running each peripheral at its optimal clock frequency, and thusmaintaining a high CPU frequency while reducing power consumption.
The SAM D21 have two software-selectable sleep modes, idle and standby. In idle mode the CPU isstopped while all other functions can be kept running. In standby all clocks and functions are stoppedexpect those selected to continue running. The device supports SleepWalking. This feature allows theperipheral to wake up from sleep based on predefined conditions, and thus allows the CPU to wake uponly when needed, e.g. when a threshold is crossed or a result is ready. The Event System supportssynchronous and asynchronous events, allowing peripherals to receive, react to and send events even instandby mode.
The Flash program memory can be reprogrammed in-system through the SWD interface. The sameinterface can be used for non-intrusive on-chip debug of application code. A boot loader running in thedevice can use any communication interface to download and upgrade the application program in theFlash memory.
The SAM D21 microcontrollers are supported with a full suite of program and system development tools,including C compilers, macro assemblers, program debugger/simulators, programmers and evaluationkits.
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2. Configuration SummarySAM D21J SAM D21G SAM D21E
Pins 64 48 (45 for WLCSP) 32 (35 for WLCSP)
General Purpose I/O-pins(GPIOs)
52 38 26
Flash 256/128/64/32KB 256/128/64/32KB 256/128/64/32KB
SRAM 32/16/8/4KB 32/16/8/4KB 32/16/8/4KB
Timer Counter (TC)instances
5 3 (5 for WLCSP) 3
Waveform output channelsper TC instance
2 2 2
Timer Counter for Control(TCC) instances
3 3 3
Waveform output channelsper TCC
8/4/2 8/4/2 6/4/2
DMA channels 12 12 12
USB interface 1 1 1
Serial CommunicationInterface (SERCOM)instances
6 6 4
Inter-IC Sound (I2S)interface
1 1 1
Analog-to-Digital Converter(ADC) channels
20 14 10
Analog Comparators (AC) 2 2 2
Digital-to-Analog Converter(DAC) channels
1 1 1
Real-Time Counter (RTC) Yes Yes Yes
RTC alarms 1 1 1
RTC compare values One 32-bit value or
two 16-bit values
One 32-bit value or
two 16-bit values
One 32-bit value or
two 16-bit values
External Interrupt lines 16 16 16
Peripheral Touch Controller(PTC) X and Y lines
16x16 12x10 10x6
Maximum CPU frequency 48MHz
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SAM D21J SAM D21G SAM D21E
Packages QFN
TQFP
UFBGA
QFN
TQFP
WLCSP
QFN
TQFP
WLCSP
Oscillators 32.768kHz crystal oscillator (XOSC32K)
0.4-32MHz crystal oscillator (XOSC)
32.768kHz internal oscillator (OSC32K)
32KHz ultra-low-power internal oscillator (OSCULP32K)
8MHz high-accuracy internal oscillator (OSC8M)
48MHz Digital Frequency Locked Loop (DFLL48M)
96MHz Fractional Digital Phased Locked Loop (FDPLL96M)
Event System channels 12 12 12
SW Debug Interface Yes Yes Yes
Watchdog Timer (WDT) Yes Yes Yes
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3. Ordering Information SAMD 21 E 15 A - M U T
Product FamilySAMD = General Purpose Microcontroller
21 = Cortex M0 + CPU, Basic Feature Set
E = 32 Pins (35 Pins for WLCSP)G = 48 Pins (45 Pins for WLCSP)J = 64 Pins
No character = Tray (Default) T = Tape and Reel
U = -40 - 85OC Matte Sn PlatingF = -40 - 125OC Matte Sn Plating
A = TQFPM = QFN U = WLCSPC = UFBGA
+ DMA + USB
Product Series
Flash Memory Density
Device VariantA = Default VariantB = Added RWW support for 32KB and 64KB memory optionsC = Silicon revision F for WLCSP35 package option.
Pin Count
Package Carrier
Package Grade
18 = 256KB17 = 128KB16 = 64KB15 = 32KB
Package Type
3.1 SAM D21ETable 3-1.Device Variant A
Ordering Code FLASH (bytes) SRAM (bytes) Package Carrier Type
ATSAMD21E15A-AU 32K 4K TQFP32 Tray
ATSAMD21E15A-AUT Tape & Reel
ATSAMD21E15A-AF Tray
ATSAMD21E15A-AFT Tape & Reel
ATSAMD21E15A-MU QFN32 Tray
ATSAMD21E15A-MUT Tape & Reel
ATSAMD21E15A-MF Tray
ATSAMD21E15A-MFT Tape & Reel
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Ordering Code FLASH (bytes) SRAM (bytes) Package Carrier Type
ATSAMD21E16A-AU 64K 8K TQFP32 Tray
ATSAMD21E16A-AUT Tape & Reel
ATSAMD21E16A-AF Tray
ATSAMD21E16A-AFT Tape & Reel
ATSAMD21E16A-MU QFN32 Tray
ATSAMD21E16A-MUT Tape & Reel
ATSAMD21E16A-MF Tray
ATSAMD21E16A-MFT Tape & Reel
ATSAMD21E17A-AU 128K 16K TQFP32 Tray
ATSAMD21E17A-AUT Tape & Reel
ATSAMD21E17A-AF Tray
ATSAMD21E17A-AFT Tape & Reel
ATSAMD21E17A-MU QFN32 Tray
ATSAMD21E17A-MUT Tape & Reel
ATSAMD21E17A-MF Tray
ATSAMD21E17A-MFT Tape & Reel
ATSAMD21E18A-AU 256K 32K TQFP32 Tray
ATSAMD21E18A-AUT Tape & Reel
ATSAMD21E18A-AF Tray
ATSAMD21E18A-AFT Tape & Reel
ATSAMD21E18A-MU QFN32 Tray
ATSAMD21E18A-MUT Tape & Reel
ATSAMD21E18A-MF Tray
ATSAMD21E18A-MFT Tape & Reel
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Table 3-2.Device Variant B
Ordering Code FLASH (bytes) SRAM (bytes) Package Carrier Type
ATSAMD21E15B-AU 32K 4K TQFP32 Tray
ATSAMD21E15B-AUT Tape & Reel
ATSAMD21E15B-AF Tray
ATSAMD21E15B-AFT Tape & Reel
ATSAMD21E15B-MU QFN32 Tray
ATSAMD21E15B-MUT Tape & Reel
ATSAMD21E15B-MF Tray
ATSAMD21E15B-MFT Tape & Reel
ATSAMD21E15B-UUT WLCSP35 (GJR) Tape & Reel
ATSAMD21E16B-AU 64K 8K TQFP32 Tray
ATSAMD21E16B-AUT Tape & Reel
ATSAMD21E16B-AF Tray
ATSAMD21E16B-AFT Tape & Reel
ATSAMD21E16B-MU QFN32 Tray
ATSAMD21E16B-MUT Tape & Reel
ATSAMD21E16B-MF Tray
ATSAMD21E16B-MFT Tape & Reel
ATSAMD21E16B-UUT 64K 8K WLCSP35 (GJR) Tape & Reel
Table 3-3.Device Variant C
Ordering Code FLASH (bytes) SRAM (bytes) Package Carrier Type
ATSAMD21E15C-UUT 32K 4K WLCSP35 (GJS) Tape & Reel
ATSAMD21E16C-UUT 64K 8K WLCSP35 (GJS) Tape & Reel
32-bit ARM-Based Microcontrollers
2017 Microchip Technology Inc. Datasheet Complete 40001882A-page 17
3.2 SAM D21GTable 3-4.Device Variant A
Ordering Code FLASH (bytes) SRAM (bytes) Package Carrier Type
ATSAMD21G15A-AU 32K 4K TQFP48 Tray
ATSAMD21G15A-AUT Tape & Reel
ATSAMD21G15A-AF Tray
ATSAMD21G15A-AFT Tape & Reel
ATSAMD21G15A-MU QFN48 Tray
ATSAMD21G15A-MUT Tape & Reel
ATSAMD21G15A-MF Tray
ATSAMD21G15A-MFT Tape & Reel
ATSAMD21G16A-AU 64K 8K TQFP48 Tray
ATSAMD21G16A-AUT Tape & Reel
ATSAMD21G16A-AF Tray
ATSAMD21G16A-AFT Tape & Reel
ATSAMD21G16A-MU QFN48 Tray
ATSAMD21G16A-MUT Tape & Reel
ATSAMD21G16A-MF Tray
ATSAMD21G16A-MFT Tape & Reel
ATSAMD21G17A-AU 128K 16K TQFP48 Tray
ATSAMD21G17A-AUT Tape & Reel
ATSAMD21G17A-AF Tray
ATSAMD21G17A-AFT Tape & Reel
ATSAMD21G17A-MU QFN48 Tray
ATSAMD21G17A-MUT Tape & Reel
ATSAMD21G17A-MF Tray
ATSAMD21G17A-MFT Tape & Reel
ATSAMD21G17A-UUT WLCSP45 Tape & Reel
32-bit ARM-Based Microcontrollers
2017 Microchip Technology Inc. Datasheet Complete 40001882A-page 18
Ordering Code FLASH (bytes) SRAM (bytes) Package Carrier Type
ATSAMD21G18A-AU 256K 32K TQFP48 Tray
ATSAMD21G18A-AUT Tape & Reel
ATSAMD21G18A-AF Tray
ATSAMD21G18A-AFT Tape & Reel
ATSAMD21G18A-MU QFN48 Tray
ATSAMD21G18A-MUT Tape & Reel
ATSAMD21G18A-MF Tray
ATSAMD21G18A-MFT Tape & Reel
ATSAMD21G18A-UUT WLCSP45 Tape & Reel
Table 3-5.Device Variant B
Ordering Code FLASH (bytes) SRAM (bytes) Package Carrier Type
ATSAMD21G15B-AU 32K 4K TQFP48 Tray
ATSAMD21G15B-AUT Tape & Reel
ATSAMD21G15B-AF Tray
ATSAMD21G15B-AFT Tape & Reel
ATSAMD21G15B-MU QFN48 Tray
ATSAMD21G15B-MUT Tape & Reel
ATSAMD21G15B-MF Tray
ATSAMD21G15B-MFT Tape & Reel
ATSAMD21G16B-AU 64K 8K TQFP48 Tray
ATSAMD21G16B-AUT Tape & Reel
ATSAMD21G16B-AF Tray
ATSAMD21G16B-AFT Tape & Reel
ATSAMD21G16B-MU QFN48 Tray
ATSAMD21G16B-MUT Tape & Reel
ATSAMD21G16B-MF Tray
ATSAMD21G16B-MFT Tape & Reel
32-bit ARM-Based Microcontrollers
2017 Microchip Technology Inc. Datasheet Complete 40001882A-page 19
3.3 SAM D21JTable 3-6.Device Variant A
Ordering Code FLASH (bytes) SRAM (bytes) Package Carrier Type
ATSAMD21J15A-AU 32K 4K TQFP64 Tray
ATSAMD21J15A-AUT Tape & Reel
ATSAMD21J15A-AF Tray
ATSAMD21J15A-AFT Tape & Reel
ATSAMD21J15A-MU QFN64 Tray
ATSAMD21J15A-MUT Tape & Reel
ATSAMD21J15A-MF Tray
ATSAMD21J15A-MFT Tape & Reel
ATSAMD21J16A-AU 64K 8K TQFP64 Tray
ATSAMD21J16A-AUT Tape & Reel
ATSAMD21J16A-AF Tray
ATSAMD21J16A-AFT Tape & Reel
ATSAMD21J16A-MU QFN64 Tray
ATSAMD21J16A-MUT Tape & Reel
ATSAMD21J16A-MF Tray
ATSAMD21J16A-MFT Tape & Reel
ATSAMD21J16A-CU UFBGA64 Tray
ATSAMD21J16A-CUT Tape & Reel
ATSAMD21J17A-AU 128K 16K TQFP64 Tray
ATSAMD21J17A-AUT Tape & Reel
ATSAMD21J17A-AF Tray
ATSAMD21J17A-AFT Tape & Reel
ATSAMD21J17A-MU QFN64 Tray
ATSAMD21J17A-MUT Tape & Reel
ATSAMD21J17A-MF Tray
ATSAMD21J17A-MFT Tape & Reel
ATSAMD21J17A-CU UFBGA64 Tray
ATSAMD21J17A-CUT Tape & Reel
32-bit ARM-Based Microcontrollers
2017 Microchip Technology Inc. Datasheet Complete 40001882A-page 20
Ordering Code FLASH (bytes) SRAM (bytes) Package Carrier Type
ATSAMD21J18A-AU 256K 32K TQFP64 Tray
ATSAMD21J18A-AUT Tape & Reel
ATSAMD21J18A-AF Tray
ATSAMD21J18A-AFT Tape & Reel
ATSAMD21J18A-MU QFN64 Tray
ATSAMD21J18A-MUT Tape & Reel
ATSAMD21J18A-MF Tray
ATSAMD21J18A-MFT Tape & Reel
ATSAMD21J18A-CU UFBGA64 Tray
ATSAMD21J18A-CUT Tape & Reel
Table 3-7.Device Variant B
Ordering Code FLASH (bytes) SRAM (bytes) Package Carrier Type
ATSAMD21J15B-AU 32K 4K TQFP64 Tray
ATSAMD21J15B-AUT Tape & Reel
ATSAMD21J15B-AF Tray
ATSAMD21J15B-AFT Tape & Reel
ATSAMD21J15B-MU QFN64 Tray
ATSAMD21J15B-MUT Tape & Reel
ATSAMD21J15B-MF Tray
ATSAMD21J15B-MFT Tape & Reel
ATSAMD21J16B-AU 64K 8K TQFP64 Tray
ATSAMD21J16B-AUT Tape & Reel
ATSAMD21J16B-AF Tray
ATSAMD21J16B-AFT Tape & Reel
ATSAMD21J16B-MU QFN64 Tray
ATSAMD21J16B-MUT Tape & Reel
ATSAMD21J16B-MF Tray
ATSAMD21J16B-MFT Tape & Reel
ATSAMD21J16B-CU UFBGA64 Tray
ATSAMD21J16B-CUT Tape & Reel
32-bit ARM-Based Microcontrollers
2017 Microchip Technology Inc. Datasheet Complete 40001882A-page 21
3.4 Device IdentificationThe DSU - Device Service Unit peripheral provides the Device Selection bits in the Device Identificationregister (DID.DEVSEL) in order to identify the device by software. The SAM D21 variants have a resetvalue of DID=0x1001drxx, with the LSB identifying the die number ('d'), the die revision ('r') and thedevice selection ('xx').
Table 3-8.SAM D21 Device Identification Values
Device Variant DID.DEVSEL Device ID (DID)
SAMD21J18A 0x00 0x10010000
SAMD21J17A 0x01 0x10010001
SAMD21J16A 0x02 0x10010002
SAMD21J15A 0x03 0x10010003
Reserved 0x04
SAMD21G18A 0x05 0x10010005
SAMD21G17A 0x06 0x10010006
SAMD21G16A 0x07 0x10010007
SAMD21G15A 0x08 0x10010008
Reserved 0x09
SAMD21E18A 0x0A 0x1001000A
SAMD21E17A 0x0B 0x1001000B
SAMD21E16A 0x0C 0x1001000C
SAMD21E15A 0x0D 0x1001000D
Reserved 0x0E
SAMD21G18A (WLCSP) 0x0F 0x1001000F
SAMD21G17A (WLCSP) 0x10 0x10010010
Reserved 0x11 - 0x1F
SAMD21J16B 0x20 0x10011420 (die revision E)
0x10011520 (die revision F)
SAMD21J15B 0x21 0x10011421 (die revision E)
0x10011521 (die revision F)
Reserved 0x22
SAMD21G16B 0x23 0x10011423 (die revision E)
0x10011523 (die revision F)
SAMD21G15B 0x24 0x10011424 (die revision E)
0x10011524 (die revision F)
32-bit ARM-Based Microcontrollers
2017 Microchip Technology Inc. Datasheet Complete 40001882A-page 22
Device Variant DID.DEVSEL Device ID (DID)
Reserved 0x25
SAMD21E16B 0x26 0x10011426 (die revision E)
0x10011526 (die revision F)
SAMD21E15B 0x27 0x10011427 (die revision E)
0x10011527 (die revision F)
Reserved 0x28-0x54
SAMD21E16B (WLCSP) 0x55 0x10011455 (die revision E)
SAMD21E15B (WLCSP) 0x56 0x10011456 (die revision E)
Reserved 0x57 - 0x61
SAMD21E16C (WLCSP) 0x62 0x10011562 (die revision F)
SAMD21E15C (WLCSP) 0x63 0x10011563 (die revision F)
Reserved 0x64-0xFF
Note: The device variant (last letter of the ordering number) is independent of the die revision(DSU.DID.REVISION): The device variant denotes functional differences, whereas the die revision marksevolution of the die. The device variant denotes functional differences, whereas the die revision marksevolution of the die.
Related LinksDID
32-bit ARM-Based Microcontrollers
2017 Microchip Technology Inc. Datasheet Complete 40001882A-page 23
4. Block Diagram
6 x SERCOM
8 x Timer Counter
REAL TIME COUNTER
AHB-APB BRIDGE C
M
MHIGH SPEED BUS MATRIX
POR
T
PO
RT
WATCHDOG TIMER
SERIAL WIRESWDIO
S
CORTEX-M0+ PROCESSOR Fmax 48 MHz
SWCLK
DEVICE SERVICE
UNIT
AHB-APB BRIDGE A
20-CHANNEL 12-bit ADC 350KSPS
AIN[19..0]
VREFA
AIN[3..0]
S
SRAM CONTROLLER
32/16/8/4KB RAM
M
RESET CONTROLLER
SLEEP CONTROLLER
CLOCK CONTROLLER
POWER MANAGER
RESETN
5 x TIMER / COUNTER
EVE
NT
SYST
EM
S
6 x SERCOM
2 ANALOG COMPARATORS
SYSTEM CONTROLLER
XOUT XIN
XOUT32 XIN32
OSCULP32K
OSC32K
OSC8M
DFLL48M
BOD33
XOSC32K
XOSC
VREF
X[15..0]
Y[15..0]
PERIPHERAL TOUCH
CONTROLLER
PERIPHERAL ACCESS CONTROLLER
AHB-APB BRIDGE B
VREFA
VOUT
10-bit DAC
EXTERNAL INTERRUPT CONTROLLER
PERIPHERAL ACCESS CONTROLLER
PERIPHERAL ACCESS CONTROLLER
EXTINT[15..0] NMI
GCLK_IO[7..0]
S
PAD0
WO1
PAD1PAD2PAD3
WO0
VREFB
256/128/64/32KB NVM
NVM CONTROLLER
Cache
S
DMA
USB FSDEVICE
MINI-HOST
DP
DM
3x TIMER / COUNTERFOR CONTROL
WOn
IOBUS
FDPLL96MDMA
DMA
DMA
DMA
DMA
MCK[1..0]SCK[1..0]INTER-IC
SOUND CONTROLLER
SD[1..0]FS[1..0]
DMA
MIC
RO
TRAC
E BU
FFER
SOF 1KHZ
WO0WO1
(2)
GENERIC CLOCKCONTROLLER
CMP[1..0]
1. Some products have different number of SERCOM instances, Timer/Counter instances, PTCsignals and ADC signals. Refer to the Configuration Summary for details.
2. The three TCC instances have different configurations, including the number of Waveform Output(WO) lines. Refer to the TCC Configuration for details.
Related LinksConfiguration SummaryTCC Configurations
32-bit ARM-Based Microcontrollers
2017 Microchip Technology Inc. Datasheet Complete 40001882A-page 24
5. Pinout
5.1 SAM D21J
5.1.1 QFN64 / TQFP64
PA00 1PA01 2PA02 3PA03 4PB04 5PB05 6
GNDANA 7VDDANA 8
PB06 9PB07 10PB08 11PB09 12PA04 13PA05 14PA06 15PA07 16
PA08
17PA
0918
PA10
19PA
1120
VDD
IO21
GN
D22
PB10
23PB
1124
PB12
25PB
1326
PB14
27PB
1528
PA12
29PA
1330
PA14
31PA
1532
VDDIO48GND47PA2546PA2445PA2344PA2243PA2142PA2041PB1740PB1639PA1938PA1837PA1736PA1635VDDIO34GND33
PB22
49PB
2350
PA27
51R
ESET
52PA
2853
GN
D54
VDD
CO
RE
55VD
DIN
56PA
3057
PA31
58PB
3059
PB31
60PB
0061
PB01
62PB
0263
PB03
64
DIGITAL PINANALOG PINOSCILLATORGROUNDINPUT SUPPLY REGULATED OUTPUT SUPPLYRESET PIN
32-bit ARM-Based Microcontrollers
2017 Microchip Technology Inc. Datasheet Complete 40001882A-page 25
5.1.2 UFBGA64
32-bit ARM-Based Microcontrollers
2017 Microchip Technology Inc. Datasheet Complete 40001882A-page 26
5.2 SAM D21G
5.2.1 QFN48 / TQFP48
PA21
PA00 1PA01 2PA02 3PA03 4
GNDANA 5VDDANA 6
PB08 7PB09 8PA04 9PA05 10PA06 11PA07 12
PA08
13PA
0914
PA10
15PA
1116
VDD
IO17
GN
D18
PB10
19PB
1120
PA12
21PA
1322
PA14
23PA
1524
VDDIO36GND35PA2534PA2433PA2332PA2231
30PA2029PA1928PA1827PA1726PA1625
PB22
37PB
2338
PA27
39R
ESET
40PA
2841
GN
D42
VDD
CO
RE
43VD
DIN
44PA
3045
PA31
46PB
0247
PB03
48
DIGITAL PINANALOG PINOSCILLATORGROUNDINPUT SUPPLYREGULATED OUTPUT SUPPLYRESET PIN
32-bit ARM-Based Microcontrollers
2017 Microchip Technology Inc. Datasheet Complete 40001882A-page 27
5.2.2 WLCSP45
A
32-bit ARM-Based Microcontrollers
2017 Microchip Technology Inc. Datasheet Complete 40001882A-page 28
5.3 SAM D21E
5.3.1 QFN32 / TQFP32
PA00 1PA01 2PA02 3PA03 4PA04 5PA05 6PA06 7PA07 8
VDD
ANA
9G
ND
10PA
0811
PA09
12PA
1013
PA11
14PA
1415
PA15
16
PA2524PA2423PA2322PA2221PA1920PA1819PA1718PA1617
PA27
25R
ESET
26PA
2827
GN
D28
VDD
CO
RE
29VD
DIN
30PA
3031
PA31
32
DIGITAL PINANALOG PINOSCILLATORGROUNDINPUT SUPPLYREGULATED OUTPUT SUPPLYRESET PIN
32-bit ARM-Based Microcontrollers
2017 Microchip Technology Inc. Datasheet Complete 40001882A-page 29
5.3.2 WLCSP35
PA00
PA01
GNDA
NA
VDDA
NA
PA06
VDDIO PA1
5
PA18
PA19
PA23
PA24
PA25
PA14
PA16
PA17
PA22
PA27
RESE
T
PA03
PA05
PA10
PA08
VDDIN
VDDC
ORE
PA02
PA04
PA07
PA31
PA30
PA11
PA09
PA28
GND
GND
GND
1
2
3
4
5
6
A B C D E F
32-bit ARM-Based Microcontrollers
2017 Microchip Technology Inc. Datasheet Complete 40001882A-page 30
6. Signal Descriptions ListThe following table gives details on signal names classified by peripheral.
Signal Name Function Type Active Level
Analog Comparators - AC
AIN[3:0] AC Analog Inputs Analog
CMP[:0] AC Comparator Outputs Digital
Analog Digital Converter - ADC
AIN[19:0] ADC Analog Inputs Analog
VREFA ADC Voltage External Reference A Analog
VREFB ADC Voltage External Reference B Analog
Digital Analog Converter - DAC
VOUT DAC Voltage output Analog
VREFA DAC Voltage External Reference Analog
External Interrupt Controller
EXTINT[15:0] External Interrupts Input
NMI External Non-Maskable Interrupt Input
Generic Clock Generator - GCLK
GCLK_IO[7:0] Generic Clock (source clock or generic clock generatoroutput)
I/O
Inter-IC Sound Controller - I2S
MCK[1:0] Master Clock I/O
SCK[1:0] Serial Clock I/O
FS[1:0] I2S Word Select or TDM Frame Sync I/O
SD[1:0] Serial Data Input or Output I/O
Power Manager - PM
RESETN Reset Input Low
Serial Communication Interface - SERCOMx
PAD[3:0] SERCOM I/O Pads I/O
System Control - SYSCTRL
XIN Crystal Input Analog/ Digital
XIN32 32kHz Crystal Input Analog/ Digital
XOUT Crystal Output Analog
XOUT32 32kHz Crystal Output Analog
32-bit ARM-Based Microcontrollers
2017 Microchip Technology Inc. Datasheet Complete 40001882A-page 31
Signal Name Function Type Active Level
Timer Counter - TCx
WO[1:0] Waveform Outputs Output
Timer Counter - TCCx
WO[1:0] Waveform Outputs Output
Peripheral Touch Controller - PTC
X[15:0] PTC Input Analog
Y[15:0] PTC Input Analog
General Purpose I/O - PORT
PA25 - PA00 Parallel I/O Controller I/O Port A I/O
PA28 - PA27 Parallel I/O Controller I/O Port A I/O
PA31 - PA30 Parallel I/O Controller I/O Port A I/O
PB17 - PB00 Parallel I/O Controller I/O Port B I/O
PB23 - PB22 Parallel I/O Controller I/O Port B I/O
PB31 - PB30 Parallel I/O Controller I/O Port B I/O
Universal Serial Bus - USB
DP DP for USB I/O
DM DM for USB I/O
SOF 1kHz USB Start of Frame I/O
32-bit ARM-Based Microcontrollers
2017 Microchip Technology Inc. Datasheet Complete 40001882A-page 32
7. I/O Multiplexing and Considerations
7.1 Multiplexed SignalsEach pin is by default controlled by the PORT as a general purpose I/O and alternatively it can beassigned to one of the peripheral functions A, B, C, D, E, F, G or H. To enable a peripheral function on apin, the Peripheral Multiplexer Enable bit in the Pin Configuration register corresponding to that pin(PINCFGn.PMUXEN, n = 0-31) in the PORT must be written to one. The selection of peripheral functionA to H is done by writing to the Peripheral Multiplexing Odd and Even bits in the Peripheral Multiplexingregister (PMUXn.PMUXE/O) in the PORT.
This table describes the peripheral signals multiplexed to the PORT I/O pins.
Table 7-1. PORT Function MultiplexingPin(1) I/O Pin Supply A B(2)(3) C D E F G H
SAMD21E SAMD21G SAMD21J EIC REF ADC AC PTC DAC SERCOM(2)(3) SERCOM-ALT TC(4)
/TCC
TCC COM AC/
GCLK
1 1 1 PA00 VDDANA EXTINT[0] SERCOM1/PAD[0]
TCC2/WO[0]
2 2 2 PA01 VDDANA EXTINT[1] SERCOM1/PAD[1]
TCC2/WO[1]
3 3 3 PA02 VDDANA EXTINT[2] AIN[0] Y[0] VOUT
4 4 4 PA03 VDDANA EXTINT[3] ADC/VREFADAC/
VREFA
AIN[1] Y[1]
5 PB04 VDDANA EXTINT[4] AIN[12] Y[10]
6 PB05 VDDANA EXTINT[5] AIN[13] Y[11]
9 PB06 VDDANA EXTINT[6] AIN[14] Y[12]
10 PB07 VDDANA EXTINT[7] AIN[15] Y[13]
7 11 PB08 VDDANA EXTINT[8] AIN[2] Y[14] SERCOM4/PAD[0]
TC4/WO[0]
8 12 PB09 VDDANA EXTINT[9] AIN[3] Y[15] SERCOM4/PAD[1]
TC4/WO[1]
5 9 13 PA04 VDDANA EXTINT[4] ADC/VREFB
AIN[4] AIN[0] Y[2] SERCOM0/PAD[0]
TCC0/WO[0]
6 10 14 PA05 VDDANA EXTINT[5] AIN[5] AIN[1] Y[3] SERCOM0/PAD[1]
TCC0/WO[1]
7 11 15 PA06 VDDANA EXTINT[6] AIN[6] AIN[2] Y[4] SERCOM0/PAD[2]
TCC1/WO[0]
8 12 16 PA07 VDDANA EXTINT[7] AIN[7] AIN[3] Y[5] SERCOM0/PAD[3]
TCC1/WO[1] I2S/SD[0]
11 13 17 PA08 VDDIO NMI AIN[16] X[0] SERCOM0/PAD[0]
SERCOM2/PAD[0]
TCC0/WO[0] TCC1/WO[2]
I2S/SD[1]
12 14 18 PA09 VDDIO EXTINT[9] AIN[17] X[1] SERCOM0/PAD[1]
SERCOM2/PAD[1]
TCC0/WO[1] TCC1/WO[3]
I2S/MCK[0]
13 15 19 PA10 VDDIO EXTINT[10] AIN[18] X[2] SERCOM0/PAD[2]
SERCOM2/PAD[2]
TCC1/WO[0] TCC0/WO[2]
I2S/SCK[0]
GCLK_IO[4]
14 16 20 PA11 VDDIO EXTINT[11] AIN[19] X[3] SERCOM0/PAD[3]
SERCOM2/PAD[3]
TCC1/WO[1] TCC0/WO[3]
I2S/FS[0] GCLK_IO[5]
19 23 PB10 VDDIO EXTINT[10] SERCOM4/PAD[2]
TC5/WO[0] TCC0/WO[4]
I2S/MCK[1]
GCLK_IO[4]
20 24 PB11 VDDIO EXTINT[11] SERCOM4/PAD[3]
TC5/WO[1] TCC0/WO[5]
I2S/SCK[1]
GCLK_IO[5]
25 PB12 VDDIO EXTINT[12] X[12] SERCOM4/PAD[0]
TC4/WO[0] TCC0/WO[6]
I2S/FS[1] GCLK_IO[6]
26 PB13 VDDIO EXTINT[13] X[13] SERCOM4/PAD[1]
TC4/WO[1] TCC0/WO[7]
GCLK_IO[7]
27 PB14 VDDIO EXTINT[14] X[14] SERCOM4/PAD[2]
TC5/WO[0] GCLK_IO[0]
32-bit ARM-Based Microcontrollers
2017 Microchip Technology Inc. Datasheet Complete 40001882A-page 33
Pin(1) I/O Pin Supply A B(2)(3) C D E F G H
SAMD21E SAMD21G SAMD21J EIC REF ADC AC PTC DAC SERCOM(2)(3) SERCOM-ALT TC(4)
/TCC
TCC COM AC/
GCLK
28 PB15 VDDIO EXTINT[15] X[15] SERCOM4/PAD[3]
TC5/WO[1] GCLK_IO[1]
21 29 PA12 VDDIO EXTINT[12] SERCOM2/PAD[0]
SERCOM4/PAD[0]
TCC2/WO[0] TCC0/WO[6]
AC/CMP[0]
22 30 PA13 VDDIO EXTINT[13] SERCOM2/PAD[1]
SERCOM4/PAD[1]
TCC2/WO[1] TCC0/WO[7]
AC/CMP[1]
15 23 31 PA14 VDDIO EXTINT[14] SERCOM2/PAD[2]
SERCOM4/PAD[2]
TC3/WO[0] TCC0/WO[4]
GCLK_IO[0]
16 24 32 PA15 VDDIO EXTINT[15] SERCOM2/PAD[3]
SERCOM4/PAD[3]
TC3/WO[1] TCC0/WO[5]
GCLK_IO[1]
17 25 35 PA16 VDDIO EXTINT[0] X[4] SERCOM1/PAD[0]
SERCOM3/PAD[0]
TCC2/WO[0] TCC0/WO[6]
GCLK_IO[2]
18 26 36 PA17 VDDIO EXTINT[1] X[5] SERCOM1/PAD[1]
SERCOM3/PAD[1]
TCC2/WO[1] TCC0/WO[7]
GCLK_IO[3]
19 27 37 PA18 VDDIO EXTINT[2] X[6] SERCOM1/PAD[2]
SERCOM3/PAD[2]
TC3/WO[0] TCC0/WO[2]
AC/CMP[0]
20 28 38 PA19 VDDIO EXTINT[3] X[7] SERCOM1/PAD[3]
SERCOM3/PAD[3]
TC3/WO[1] TCC0/WO[3]
I2S/SD[0] AC/CMP[1]
39 PB16 VDDIO EXTINT[0] SERCOM5/PAD[0]
TC6/WO[0] TCC0/WO[4]
I2S/SD[1] GCLK_IO[2]
40 PB17 VDDIO EXTINT[1] SERCOM5/PAD[1]
TC6/WO[1] TCC0/WO[5]
I2S/MCK[0]
GCLK_IO[3]
29 41 PA20 VDDIO EXTINT[4] X[8] SERCOM5/PAD[2]
SERCOM3/PAD[2]
TC7/WO[0] TCC0/WO[6]
I2S/SCK[0]
GCLK_IO[4]
30 42 PA21 VDDIO EXTINT[5] X[9] SERCOM5/PAD[3]
SERCOM3/PAD[3]
TC7/WO[1] TCC0/WO[7]
I2S/FS[0] GCLK_IO[5]
21 31 43 PA22 VDDIO EXTINT[6] X[10] SERCOM3/PAD[0]
SERCOM5/PAD[0]
TC4/WO[0] TCC0/WO[4]
GCLK_IO[6]
22 32 44 PA23 VDDIO EXTINT[7] X[11] SERCOM3/PAD[1]
SERCOM5/PAD[1]
TC4/WO[1] TCC0/WO[5]
USB/SOF1kHz
GCLK_IO[7]
23 33 45 PA24(6) VDDIO EXTINT[12] SERCOM3/PAD[2]
SERCOM5/PAD[2]
TC5/WO[0] TCC1/WO[2]
USB/DM
24 34 46 PA25(6) VDDIO EXTINT[13] SERCOM3/PAD[3]
SERCOM5/PAD[3]
TC5/WO[1] TCC1/WO[3]
USB/DP
37 49 PB22 VDDIO EXTINT[6] SERCOM5/PAD[2]
TC7/WO[0] GCLK_IO[0]
38 50 PB23 VDDIO EXTINT[7] SERCOM5/PAD[3]
TC7/WO[1] GCLK_IO[1]
25 39 51 PA27 VDDIO EXTINT[15] GCLK_IO[0]
27 41 53 PA28 VDDIO EXTINT[8] GCLK_IO[0]
31 45 57 PA30 VDDIO EXTINT[10] SERCOM1/PAD[2]
TCC1/WO[0] SWCLK GCLK_IO[0]
32 46 58 PA31 VDDIO EXTINT[11] SERCOM1/PAD[3]
TCC1/WO[1] SWDIO(5)
59 PB30 VDDIO EXTINT[14] SERCOM5/PAD[0]
TCC0/WO[0] TCC1/WO[2]
60 PB31 VDDIO EXTINT[15] SERCOM5/PAD[1]
TCC0/WO[1] TCC1/WO[3]
61 PB00 VDDANA EXTINT[0] AIN[8] Y[6] SERCOM5/PAD[2]
TC7/WO[0]
62 PB01 VDDANA EXTINT[1] AIN[9] Y[7] SERCOM5/PAD[3]
TC7/WO[1]
47 63 PB02 VDDANA EXTINT[2] AIN[10] Y[8] SERCOM5/PAD[0]
TC6/WO[0]
48 64 PB03 VDDANA EXTINT[3] AIN[11] Y[9] SERCOM5/PAD[1]
TC6/WO[1]
1. Use the SAMD21J pinout muxing for WLCSP45 package.2. All analog pin functions are on peripheral function B. Peripheral function B must be selected to
disable the digital control of the pin.3. Only some pins can be used in SERCOM I2C mode. Refer to SERCOM I2C Pins.
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2017 Microchip Technology Inc. Datasheet Complete 40001882A-page 34
4. Note that TC6 and TC7 are not supported on the SAM D21E and G devices. Refer to ConfigurationSummary for details.
5. This function is only activated in the presence of a debugger.6. If the PA24 and PA25 pins are not connected, it is recommended to enable a pull-up on PA24 and
PA25 through input GPIO mode. The aim is to avoid an eventually extract power consumption(
7.2.4 GPIO ClustersTable 7-5.GPIO Clusters
PACKAGE CLUSTER GPIO SUPPLIESPINSCONNECTEDTO THECLUSTER
64pins 1 PB31 PB30 PA31 PA30 VDDINpin56/GNDpin54
2 PA28 PA27 PB23 PB22 VDDINpin56/GNDpin54 andVDDIO pin48/GND pin47
3 PA25 PA24 PA23 PA22 PA21 PA20 PB17 PB16 PA19 PA18 PA17 PA16 VDDIO pin48/GND pin47and VDDIOpin34/GNDpin33
4 PA15 PA14 PA13 PA12 PB15 PB14 PB13 PB12 PB11 PB10 VDDIO pin34/GND pin33and VDDIOpin21/GNDpin22
5 PA11 PA10 PA09 PA08 VDDIOpin21/GNDpin22
6 PA07 PA06 PA05 PA04 PB09 PB08 PB07 PB06 VDDANA pin8/GNDANApin7
7 PB05 PB04 PA03 PA02 PA01 PA00 PB03 PB02 PB01 PB00 VDDANA pin8/GNDANApin7
48pins 1 PA31 PA30 VDDINpin44/GNDpin42
2 PA28 PA27 PB23 PB22 VDDINpin44/GNDpin42 andVDDIOpin36/GNDpin35
3 PA25 PA24 PA23 PA22 PA21 PA20 PA19 PA18 PA17 PA16 PA15 PA14 PA13 PA12 PB11 PB10 VDDIOpin36/GNDpin35 andVDDIOpin17/GNDpin18
4 PA11 PA10 PA09 PA08 VDDIOpin17/GNDpin18
5 PA07 PA06 PA05 PA04 PB09 PB08 VDDANA pin6/GNDANA pin5
6 PA03 PA02 PA01 PA00 PB03 PB02 VDDANA pin6/GNDANA pin5
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2017 Microchip Technology Inc. Datasheet Complete 40001882A-page 36
PACKAGE CLUSTER GPIO SUPPLIESPINSCONNECTEDTO THECLUSTER
32pins 1 PA31 PA30 VDDINpin30/GND pin28
2 PA28 PA27 PA25 PA24 PA23 PA22 PA19 PA18 PA17 PA16 PA15 PA14 PA11 PA10 PA09 PA08 VDDINpin30/GND pin28 andVDDANApin9/GNDpin10
3 PA07 PA06 PA05 PA04 PA03 PA02 PA01 PA00 VDDANApin9/GNDpin10
7.2.5 TCC ConfigurationsThe SAM D21 has three instances of the Timer/Counter for Control applications (TCC) peripheral, ,TCC[2:0]. The following table lists the features for each TCC instance.
Table 7-6.TCC Configuration Summary
TCC# Channels(CC_NUM)
WaveformOutput
(WO_NUM)
Countersize
Fault Dithering Outputmatrix
Dead TimeInsertion
(DTI)
SWAP Patterngeneration
0 4 8 24-bit Yes Yes Yes Yes Yes Yes
1 2 4 24-bit Yes Yes Yes
2 2 2 16-bit Yes
Note: The number of CC registers (CC_NUM) for each TCC corresponds to the number of compare/capture channels, so that a TCC can have more Waveform Outputs (WO_NUM) than CC registers.
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2017 Microchip Technology Inc. Datasheet Complete 40001882A-page 37
8. Power Supply and Start-Up Considerations
8.1 Power Domain Overview
VOLTAGEREGULATOR
VDD
IN
VDD
CO
RE
GN
DADC
AC
DAC
PTC
XOSC32K
OSC32K
VDD
ANA
GN
DAN
A
PA[7:2]
PB[9:0]
PA[1:0]
Digital Logic(CPU, peripherals)
DFLL48M
VDD
IO
OSC8M
XOSC
OSCULP32K
PA[31:16]
PB[31:10]
PA[15:14]
BOD33
POR
PA[13:8]BOD12
FDPLL96M
8.2 Power Supply Considerations
8.2.1 Power SuppliesThe device has several different power supply pins:
VDDIO: Powers I/O lines, OSC8M and XOSC. Voltage is 1.62V to 3.63V. VDDIN: Powers I/O lines and the internal regulator. Voltage is 1.62V to 3.63V. VDDANA: Powers I/O lines and the ADC, AC, DAC, PTC, OSCULP32K, OSC32K, XOSC32K.
Voltage is 1.62V to 3.63V. VDDCORE: Internal regulated voltage output. Powers the core, memories, peripherals, FDPLL96M,
and DFLL48M. Voltage is 1.2V.
The same voltage must be applied to both VDDIN, VDDIO and VDDANA. This common voltage isreferred to as VDD in the datasheet.
The ground pins, GND, are common to VDDCORE, VDDIO and VDDIN. The ground pin for VDDANA isGNDANA.
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For decoupling recommendations for the different power supplies. Refer to Schematic Checklist fordetails.
Related LinksSchematic Checklist
8.2.2 Voltage RegulatorThe voltage regulator has two different modes:
Normal mode: To be used when the CPU and peripherals are running Low Power (LP) mode: To be used when the regulator draws small static current. It can be used in
standby mode
8.2.3 Typical Powering SchematicsThe device uses a single main supply with a range of 1.62V - 3.63V.
The following figure shows the recommended power supply connection.
Figure 8-1.Power Supply Connection
(1.62V 3.63V)Main Supply VDDIO
VDDANA
VDDIN
VDDCORE
GND
GNDANA
DEVICE
8.2.4 Power-Up Sequence
8.2.4.1 Minimum Rise RateThe integrated power-on reset (POR) circuitry monitoring the VDDANA power supply requires a minimumrise rate. Refer to the Electrical Characteristics for details.
Related LinksElectrical Characteristics
8.2.4.2 Maximum Rise RateThe rise rate of the power supply must not exceed the values described in Electrical Characteristics.Refer to the Electrical Characteristics for details.
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2017 Microchip Technology Inc. Datasheet Complete 40001882A-page 39
Related LinksElectrical Characteristics
8.3 Power-UpThis section summarizes the power-up sequence of the device. The behavior after power-up is controlledby the Power Manager. Refer to PM Power Manager for details.
Related LinksPM Power Manager
8.3.1 Starting of ClocksAfter power-up, the device is set to its initial state and kept in reset, until the power has stabilizedthroughout the device. Once the power has stabilized, the device will use a 1MHz clock. This clock isderived from the 8MHz Internal Oscillator (OSC8M), which is divided by eight and used as a clock sourcefor generic clock generator 0. Generic clock generator 0 is the main clock for the Power Manager (PM).
Some synchronous system clocks are active, allowing software execution.
Refer to the Clock Mask Register section in PM Power Manager for the list of default peripheral clocksrunning. Synchronous system clocks that are running are by default not divided and receive a 1MHz clockthrough generic clock generator 0. Other generic clocks are disabled except GCLK_WDT, which is usedby the Watchdog Timer (WDT).
Related LinksPM Power Manager
8.3.2 I/O PinsAfter power-up, the I/O pins are tri-stated.
8.3.3 Fetching of Initial InstructionsAfter reset has been released, the CPU starts fetching PC and SP values from the reset address, whichis 0x00000000. This address points to the first executable address in the internal flash. The code readfrom the internal flash is free to configure the clock system and clock sources. Refer to PM PowerManager, GCLK Generic Clock Controller and SYSCTRL System Controller for details. Refer to theARM Architecture Reference Manual for more information on CPU startup (http://www.arm.com).
Related LinksPM Power ManagerSYSCTRL System ControllerClock System
8.4 Power-On Reset and Brown-Out DetectorThe SAM D21 embeds three features to monitor, warn and/or reset the device:
POR: Power-on reset on VDDA