USB UART LDLJuly 2009

Rakesh Bhatia

Sr. Manager, Strategic Marketing

Interface Product Line

Company Confidential

2

BRE

Industrial/POS

Servers

Blade ServerscPCI Servers

Communications

Console Servers

KVM Switches

Wireless Transceiver

GPS/Telematics

Consumer

Set Top Box

HDTVMFP

Tablets

Embedded Systems

PC104/104+

ISA

PCI

MB

Network Routers

Markets and Applications

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USB UART

XR21V1410IL16-F – single channel USB UARTIndustry smallest package, QFN-16

XR21V1412IL32-F – two channel USB UARTIndustry smallest package, QFN-32

XR21V1414IM48-F – four channel USB UARTIndustry smallest package, TQFP48

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USB Basics

What is USB?USB is a serial bus standard that allows devices to connect to a host

computerData rates : Low Speed-1.5 Mbps, Full Speed(FS)-12 Mbps, High

Speed (HS)- 480 Mbps

Connection (4 Wires)Vbus - nominally 5VGNDD+D-

A simple, cost effective way to add UARTs to a system

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Target CPUs with USB Interface

Most new microcontrollersAtmel, Microchip, Freescale low end microcontroller have USB ports

and few or no UART ports

Almost all microprocessors released in the last five yearsHitachi-Renesas SH seriesMotorola-Freescale Coldfire seriesIDT RC seriesMost Intel CPUsMost IBM CPUs

Also target FPGAs & custom ASICs with USB/UART ports

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Products using processors with USB

Cell phones (especially PDA & pocket PC type)

DVD player, DVR, set-top boxes

Mid to high end PC monitors

Docking stations

PMP, PVP

Health diagnostics meters

PCs, Laptops & Netbooks

Industrial POS systems and handhelds

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USB Interface

UARTTXRX

GPIOs

GPIO5/RTS#GPIO4/CTS#GPIO3/DTR#GPIO2/DSR#

EEPROMInterface

USB_DATA+

USB_DATA-

SDA

SCL

3.3V

USB UART Block Diagram

Exar USB UART XR21V1410

48 MHz Oscillator

GPIO1/CD#GPIO0/RI#

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USB UARTs – Key FeaturesUSB 2.0 Compliant Interface

12 Mbps USB full-speed data rateSuspend, resume and remote wakeup operations

Capability to support attributes

Smallest Package in industry

Software drivers support including source code

Enhanced FeaturesData rates up to 12 Mbps on UARTFractional Baud Rate Generator128 byte TX FIFO, 384 byte RX FIFO7 or 8 data bits, 1 or 2 stop bits, parityAutomatic Hardware and Software Flow ControlMultidrop modesSelectable GPIO or Modem I/OInternal 48 MHz clock

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Benefits

Why use a USB UART?High performance at lower supply voltage

12Mbps (3.3V)

Overall System Cost ReductionFBRGNo crystal neededUSB is a simpler and easier interface to design (4 wire)

Shorter Time To MarketEasier to add UARTs than to upgrade to new CPU

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Exar USB AdvantageLowest BOM cost

Smallest packages

Complete Software supportWindows, Linux and MAC

Power Management expertise and supportUSB suspend mode supported

Fractional Baud Rate Generator Achieve desired baud rateNO external crystal needed

Exar’s Value proposition is to deliver the lowest cost solution with additional distinguishing features

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USB UART Target MarketsConsumer Segment

Cellular HandsetsPortable devices (GPS, PMP, PDAs, etc.)PC/Laptop add-ons (docking stations, plug-in adapters)

Industrial SegmentCard/Barcode ReaderGate AccessAdd-on Cards

Commercial SegmentPoint Of Sales SystemsSecurity surveillance cameras

Embedded SegmentHealth diagnostics metersEmbedded computing applications

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USB Interface

UART

USB UART Application Example 1

Add additional UART port to embedded application to communicate with serial peripherals or other systems

XR21V1410

MCU

UART

RS-232TXCVR

RS-232TXCVR

USBMaster

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Application Example 2 – Medical Equipment

XCVR UART

XCVR UART

XCVR UART

XCVR UART

USB

Legacy Bedside Devices

Console

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Application Example 3 - Industrial Controls

PLCRS-485 (

)()

()()

PLC

PLC

PLC

Stand-alone box with USB UART/s(Device Server)

USBRS-485 (

)()

()()

()()

()()

()()

()()

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Pricing and Availability

List pricing (1Ku)V1410 $1.80V1412 $3.07V1414 $5.80

Samples, Evaluation boards and driversNow

ProductionAugust 2009

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Summary

USB 2.0 Compliant Interface

Enhanced Features

Smallest packages in the industry

UART data rates up to 12 Mbps

Innovative driver that allows maximum flexibility6 GPIOs that can be programmed as flow control signals

Software drivers support – free source code

Industry’s Largest Portfolio of UART Products

&

We will be very cost competitive and

do not want to lose on price