WCT101xS Automotive MP-A9 V4.0 Wireless Charging Application · Find two UART-to-USB adapter boards...

© 2018 NXP B.V.

WCT101xS Automotive MP-A9 V4.0

Wireless Charging Application

1. Introduction

The Automotive MP-A9_Rev1.0 (MP-A9_Rev1_SCH-

29323_B2, MP-A9_Rev1_LAY-29323_B2) wireless

charging TX demo is used for wireless power transfer

to a charged device. The charged device can be any

electronic device equipped with a dedicated Qi wireless

charging receiver.

NXP Semiconductors Document Number: WCT101XSV10AUG

User's Guide Rev. 0 , 10/2018

Contents

1. Introduction........................................................................ 1 2. Key features ....................................................................... 2 3. Hardware setup .................................................................. 2

3.1. Package content ...................................................... 2 3.2. Board description .................................................... 3 3.3. Powering the board ................................................. 4 3.4. Hardware setup for FreeMASTER and console

communication ..................................................................... 5 4. Application operation ........................................................ 6 5. Hardware description ......................................................... 6

5.1. Input EMI filter ....................................................... 7 5.2. System voltage DCDC and LDO ............................ 8 5.3. Rail voltage generated by digital buck-boost or

analog buck-boost chips ........................................................ 8 5.4. Full-bridge and resonant circuits ............................. 9 5.5. Communication .................................................... 10 5.6. FOD based on power loss ..................................... 10 5.7. FOD based on Q factor change ............................. 12 5.8. Coil selection ........................................................ 14 5.9. Analog sensing ..................................................... 14

6. Application monitoring and control using FreeMASTER 14 6.1. Software setup ...................................................... 14 6.2. Real-time application variables monitoring .......... 17 6.3. Application parameters modification .................... 18

7. Application monitoring through console .......................... 19 7.1. Software setup ...................................................... 19

8. System bring-up ............................................................... 20 8.1. Ping sequences ...................................................... 20 8.2. LED indication ..................................................... 20 8.3. Debug messages.................................................... 21

Hardware setup

WCT101xS Automotive MP-A9 V4.0 Wireless Charging Application, User's Guide, Rev. 0, 10/2018

2 NXP Semiconductors

2. Key features

The key features of the Wireless Charging Transmitter (WCT) are:

• The input voltage ranges from 9 V DC to 16 V DC (automotive battery range).

• The input voltage can drop down to 6 V DC during the start-stop function.

• The nominal delivered power to the receiver is 15 W (at the output of the receiver) and it is

compatible with a 5-W receiver.

• It is designed to meet the Qi 1.2.2 specification.

• The operation frequency is 125 kHz for the Qi devices.

3. Hardware setup

3.1. Package content

The package contains:

• WCT Automotive MP-A9 (WCT - 15WTXAUTOSP):

— Demo board.

— Power supply connector.

— 12-V/3-A power supply.

Hardware setup


NXP Semiconductors 3

Figure 1. Hardware package contents

3.2. Board description

The WCT board is connected to the system via the main power connector. It comprises the automotive

battery connection (red wire = +12 V line, black wire = GND line), the CAN connection (yellow wires),

and the IGNITION (blue wire).

The connectors on the bottom edge of the board are:

• JTAG for programming.

• 2x SCI; one for FreeMASTER connection, one for console output. FreeMASTER is used for

debugging and board calibration.

• Temperature sensor connector.

• Touch sense connector.

The board circuitry is covered by a metal shield to lower the EMI and provides a fixed position for the

coils. Figure 2Figure 2 shows the device diagram.

Hardware setup



Figure 2. Device diagram

3.3. Powering the board

To power the board up, perform these steps:

1. Plug the 12-V power supply to the socket.

2. Plug the power supply connector to the board.

3. Connect the 12-V power supply to the power supply connector.

Hardware setup



Figure 3. Power supply components

3.4. Hardware setup for FreeMASTER and console communication

To set up the hardware for the FreeMASTER and console communication, perform these steps:

1. Find two UART-to-USB adapter boards and install the UART-to-USB device driver onto the PC.

The virtual serial port on the computer must work properly.

2. Plug the USB-UART conversion board to SCI connector J2 according to the SCH signal pin

position. The two UART channels each have a different purpose (FreeMASTER and console).

Figure 4. FreeMASTER and console

Hardware description



Figure 5. SCIs and JTAG connectors

4. Application operation

Connect the demo to the 12-V DC supply voltage. The WCT sends periodical power pings to check

whether a device compatible with the Wireless Charging Receiver (WCR) is placed on the charging

surface.

When a Qi-compliant device is placed on the top of the TX coils’ area, the WCT starts the charging

process. If there is no proper Qi answer from the WCR side, the TX does not start the Qi charging

process.

When the WCR answers properly, the power transfer starts. The actual level of the transferred power is

controlled by the WCT in accordance with the WCR requirements. The receiver sends messages to the

WCT through ASK in the coil resonance power signal and the transmitter sends the information to the

receiver through FSK (as per the Qi specification). The power transfer is terminated when the receiver is

removed from the WCT magnetic field.

The system supports all Qi WCR devices (Qi_Ver-1.0 compliance, Qi_Ver-1.1 compliance, and Qi EPP

15-W receiver). The system supports all Foreign Object Detection (FOD) features for different

receivers. For the low-power 5-W receiver, the power loss FOD is supported. For the EPP 15-W

receiver, both the Q-value method and the power loss FOD method are supported.

5. Hardware description

Figure 6 shows the block diagram of the automotive wireless charger MP-A9. Visit www.nxp.com to get

the latest hardware design files. The whole design consists of several blocks which are described in the

following sections.

http://www.nxp.com/




Figure 6. Automotive wireless charger MP-A9 block diagram

5.1. Input EMI filter

The J1 input connector provides the whole car-connection wiring. This connector connects the battery

voltage to the WCT and CAN communication interfaces.

The input filter consists of the common mode filter FL1 and the filter capacitors C1, C3, C4, C14, C617,

C618, and L1.

FB Inverter

Coil Switched

Digital buck-boost

Input Current

Input EMI filter

Can and Lin

NFC NCF3340

WCT101xS

UART&JTAG Q-value detection




The main battery voltage switch is equipped with MOSFET Q1. This stage is controlled by the

WCT101xS main controller and the IGNITION signal. The hardware overvoltage protection (more than

20 V DC) is implemented to this switch by D1 and Q2.

5.2. System voltage DCDC and LDO

The 12-V car battery input is connected to the U25 buck converter (MPQ4558). Its output is 5 V and

supplies the LDO U26 (MPQ8904), the MOSFET driver, and the CAN transceiver. The 3.3-V LDO

output is used mainly for the WCT101xS and other 3.3-V components.

The DCDC works in the light-load conditions. It is preferable to select high efficiency in the light-load

condition.

5.3. Rail voltage generated by digital buck-boost or analog

buck-boost chips

The Qi specification for the MP-A9 topology requires the DC voltage to control the power transferred to

the receiver. The buck-boost converter is selected to obtain the regulated DC voltage ranging from

1 V DC to 24 V DC for the full-bridge inverter power supply. The buck boost can be controlled digitally

by the WCT chip or the individual analog buck-boost converter (the WCT chip controls just the output

voltage feedback).

The digital buck-boost module includes the drivers, the full-bridge converter, and the output-voltage

feedback. The DCDC converter control loop is implemented by the firmware and the control parameters

can be optimized using different main-circuit parameters, such as the inductor and the output capacitor.

Figure 7. Digital buck-boost main circuits

For the analog buck-boost module, LTC3789 is selected to generate the rail voltage. The WCT chip

controls the rail voltage using an analog signal. This analog signal affects the analog buck-boost

converter feedback and the system can get the rail voltage as it expects.

C37110uF

C3110.1uF

50V

VRAIL_2

D84

PMEG060V050EPD

DNP

1 23

GND2

C49647pF

C3680.1uF50V

Ipeak_S2 8

R442

0.015

C449 10uF

C448 10uF

GND2

GND2

GND2

GND2

GND2

GND2

Small board 2

D56

1PS76SB10

A C

D57

1PS76SB10

A C

R400

10.0K

VDriv e_S2

R401

10.0K

C305 0.1uF

C304 0.1uF

R40210

R403 10

DBUCK_PWML_S28

DBUCK_PWMH_S28

R404 10

AUIRS2301S

U30

VCC1

HIN2

LIN3

COM4

LO5

VS6

HO7

VB8

Q51

NVTFS5820NLTAG

14

32

5

Q50

NVTFS5820NLTAG

14

32

5

Q52

NVTFS5820NLTAG

14

32

5

Q53

NVTFS5820NLTAG

14

32

5

R405

10.0K

R406

10.0K

VDriv e_S2

C308 0.1uF

R408 10

C307 0.1uF

R40710

DBOOST_PWML_S28

DBOOST_PWMH_S28

R409 10

L24

10UH

1 2

AUIRS2301S

U31

VCC1

HIN2

LIN3

COM4

LO5

VS6

HO7

VB8

VBAT_SW_2

C36910uF

R4113.32

C3191000pF

C3431000pFC344

1000pF

C3181000pF

R4663.32

R4103.32

R4673.32




Figure 8. Analog buck-boost main circuits

It is recommended to use the digital buck boost on the wireless charging solution due to its lower cost,

simpler hardware circuits, and easier control.

5.4. Full-bridge and resonant circuits

The full-bridge power stage consists of two MOSFET drivers (U8 and U9) and four power MOSFETs

(Q13, Q15, Q19, and Q20). The MOSFET drivers are powered by a stable 5-V DC voltage that

decreases the power losses in drivers and MOSFETs. The full-bridge power stage converts the variable

DC voltage (VRAIL) to the square-wave, 50-%, duty-cycle voltage with a 125-kHz frequency. The

range of the frequency (from 120 kHz to 130 kHz) is defined in the Qi specification for the MP-A9

topology.

The resonant circuits consist of C111, C112, C423, C580, and the coils, all of which have fixed values

defined in the Qi specification for the MP-A9 topology. The snubber RC pairs connected in parallel to

the power MOSFETs are used to lower the high frequency of the EMI products. The VRAIL discharge

circuits Q46 and R376 are switched on while the system is terminated.

C524 0.01uF

GND6

R6641K

R6651K

R666 68K

C525 1000pF

C526 3300pF

R6670

R6680 DNP

R669

120K

R671 0

R672 0DNPC52710uF

R676 0.015

GND6

GND6

C529 0.22uF

INTVCC9

C530 4.7uF

GND6

C531 0.22uF

GND6

VBAT_SW_6R6790

GND6

INTVCC 9

INTVCC 9

GND6

R646 2.00k

R687 2.00k

LTC3789IGN

U75

VFB1

SS2

SE

NS

E+

3

SE

NS

E-

4

ITH5

SGND6

MODE/PLLIN7

FREQ8

RUN9

VINSNS10

VOUTSNS11

ILIM12

IOSENSE+13

IOSENSE-14

TRIM15

SW216

TG217

BOOST218

BG219

EXTVCC20

INT

VC

C21

VIN22

BG123

PG

ND

24

BOOST125

TG126

SW127

PGOOD28

GND6

R6570

DCDC_PG_69

GND6

R6700VRAIL_6

R625

1.6K

C50210uF

GND6

C50310uF

GND6

C50410uF

GND6

R680 0VBAT_SW_6

C51347pF

VRAIL_6

TP64

DNP

Differential Wire

Small board 6

DCDC_EN_6 9

GND6

R634 10

R635 10

D90 1PS76SB10A C

R637 10

R636 10

R639 0

R638 0

D91

1PS76SB10

AC

R641 0

R640 0

R642 0

R643

0

C515

0.1uF50V

R6450

D85

PMEG2005AEA

AC

D86

PMEG2005AEA

AC

D87

PMEG2005AEA

AC

D88

PMEG2005AEA

AC

C5180.1uF50V

R651

0.015

R652

10.0K

R653

10.0K

Q76

NVTFS5820NLTAG

14

32

5

Q77

NVTFS5820NLTAG

14

32

5

R654

10.0K

Q78

NVTFS5820NLTAG

14

32

5

R655

10.0K

Q79

NVTFS5820NLTAG

14

32

5

L3210UH

1 2

VBAT_SW_6

C5210.1uF

50V

VRAIL_6

INTVCC9

R662200

C5234700pF

RAIL_CNTL_6 9

INTVCC 9

R66339K

R661 4.3K

GND6

R629 100DNP

R628 100DNP

VRAILB_S6

C514 1.0uF

IS-_S6 9

R677

100

R678

100

C5172700pF

C5202700pF

C5192700pF

C5162700pF

R6483.32

R6473.32

R6503.32

R6493.32




Figure 9. Full-bridge circuits and coil-selection circuits

5.5. Communication

There is a two-way communication between the medium power transceiver and the receiver.

The communication from RX to TX is as follows: The receiver measures the received power and sends

the information about the required power level back to the transmitter. This message is

Amplitude-Modulated (AM) to the coil current and sensed by the TX.

The RC circuits (C210, R116, R118, and R224), known as DDM, sample the signals from the coil,

compress the signal amplitude, and feed to the ADC 0, channel 0 of the WCT101xS. The information

about the current amplitude and modulated data are processed by the embedded software routine.

The communication from TX to RX is as follows: The TX negotiates with the RX in the negotiation

phase (if requested by the RX). The TX uses FSK modulation to communicate with the RX. The

communication frequency is about 512 times the operating frequency.

5.6. FOD based on power loss

The power loss 𝑃𝐿𝑂𝑆𝑆, which is defined as the difference between the transmitted power 𝑃𝑃𝑇 and the

received power 𝑃𝑃𝑅, i.e. 𝑃𝐿𝑂𝑆𝑆 = 𝑃𝑃𝑇 − 𝑃𝑃𝑅, provides the power absorption in Foreign Objects (FO), as

shown in Figure 10.




Figure 10. Power loss illustration

When a FO is introduced during power transfer, the power loss increases accordingly and the FO is

detected using the power-loss method.

The power-loss FOD method is divided into two types: FOD for the baseline power profile (TX and RX

can transfer no more than 5 W) and FOD for the extensions power profile (TX and RX can transfer more

than 5 W).

5.6.1. Power-loss FOD baseline

The equation for the power loss FOD baseline is 𝑃𝐿𝑂𝑆𝑆 = 𝑃𝑃𝑇 − 𝑃𝑃𝑅.

The transmitted power 𝑃𝑃𝑇 represents the amount of power that leaves the TX due to the magnetic field

of the TX, and 𝑃𝑃𝑇 = 𝑃𝑖𝑛 − 𝑃𝑃𝑇𝑙𝑜𝑠𝑠, where 𝑃𝑖𝑛 represents the input power of the TX and 𝑃𝑃𝑇𝑙𝑜𝑠𝑠 is the

power dissipated inside the TX. 𝑃𝑖𝑛 can be measured by sampling the input voltage and the input

current, and 𝑃𝑃𝑇𝑙𝑜𝑠𝑠 can be estimated through the coil current.

The received power 𝑃𝑃𝑅 represents the amount of power that dissipates within the RX due to the

magnetic field of the TX, and 𝑃𝑃𝑅 = 𝑃𝑂𝑢𝑡 + 𝑃𝑃𝑅𝑙𝑜𝑠𝑠. The power 𝑃𝑂𝑢𝑡 is provided at the RX output and

𝑃𝑃𝑅𝑙𝑜𝑠𝑠 is the power lost inside the RX.

When the WCT-15WTXAUTOSP charges a baseline-profile RX, the power-loss baseline is applied.

The TX continuously monitors 𝑃𝐿𝑂𝑆𝑆, and if it exceeds the threshold several times, the TX terminates

the power transfer.

5.6.2. Power-loss FOD extensions

The RX estimates the power loss inside itself to determine its received power. Similarly, the TX

estimates the power loss inside itself to determine its transmitted power. A systematic bias in these

estimates results in a difference between the transmitted power and the received power, even if there is

no FO present on the interface surface. To increase the effectiveness of the power-loss method, the TX




can remove the bias in the calculated power loss using calibration. For this purpose, the TX and power

RX execute the calibration phase before the power transfer phase starts. The TX must verify that there is

no FO present on its interface surface before the calibration phase and the FOD based on the Q factor

can run.

Because the bias in the estimates can be dependent on the power level, the TX and RX determine their

transmitted power and received power under two load conditions—a “light” load and a “connected”

load. The “light” load is close to the minimum expected output power, and the “connected” load is close

to the maximum expected output power. Based on the two load conditions, the power transmitter can

calibrate its transmitted power using linear interpolation. Alternatively, the power transmitter can

calibrate the reported received power.

Take the calibrated transmitted power as an example:

𝑃𝑃𝑇𝑐𝑎𝑙 = 𝑎 ∗ 𝑃𝑃𝑇 + 𝑏

a =𝑃𝑃𝑅

(𝑐𝑜𝑛𝑛𝑒𝑐𝑡𝑒𝑑)− 𝑃𝑃𝑅

(𝑙𝑖𝑔ℎ𝑡)

𝑃𝑃𝑇(𝑐𝑜𝑛𝑛𝑒𝑐𝑡𝑒𝑑)

− 𝑃𝑃𝑇(𝑙𝑖𝑔ℎ𝑡)

b =𝑃𝑃𝑇

(𝑐𝑜𝑛𝑛𝑒𝑐𝑡𝑒𝑑)∗ 𝑃𝑃𝑅

(𝑙𝑖𝑔ℎ𝑡)− 𝑃𝑃𝑅

(𝑐𝑜𝑛𝑛𝑒𝑐𝑡𝑒𝑑)∗ 𝑃𝑃𝑇

(𝑙𝑖𝑔ℎ𝑡)

𝑃𝑃𝑇(𝑐𝑜𝑛𝑛𝑒𝑐𝑡𝑒𝑑)

− 𝑃𝑃𝑇(𝑙𝑖𝑔ℎ𝑡)

Therefore, the TX uses the calibrated transmitted power to determine the power loss as follows:

𝑃𝐿𝑂𝑆𝑆 = 𝑃𝑃𝑇𝑐𝑎𝑙 − 𝑃𝑃𝑅

When the WCT-15WTXAUTOSP charges an RX baseline, only the power-loss FOD baseline works. If

an RX extension is placed on the WCT-15WTXAUTOSP, the Q factor is measured to detect whether an

FO is present. If yes, the TX stops charging. Otherwise, the TX can proceed to the calibration phase and

the power-transfer phase and the power-loss FOD extension works to detect if an FO is inserted during

the power-transfer phase.

For details about FOD, see the WCT101xS Automotive MP-A9 Run-Time Debug User’s Guide

(document WCT101XARTDUG).

5.7. FOD based on Q factor change

A change in the TX coil environment typically causes its inductance to decrease or its equivalent series

resistance to increase. Both effects lead to a decrease of the TX coil Q factor. The RX sends a packet

including the reference Q factor for the TX to compare and determine whether an FO is present, as

shown in Figure 11. The reference Q factor is defined as the Q factor of the test power transmitter

#MP1’s primary coil at the operating frequency of 100 kHz with the RX positioned on the interface

surface and with no FO nearby. Due to design differences between the design and the reference power

transmitter #MP1 design, the measured Q factor values can differ. The TX must convert the Q factor it

measured to that of the test power transmitter #MP1. NXP provides a conversion method and must get

the parameters of the board first. The TX performs automatic calibration and gets the parameters the

first time it is powered up after flashing a new image, and these parameters are written to the flash.

Therefore, it is necessary to ensure that there is no object on the TX surface when it is powered for the

first time after flashing a new image.

http://www.nxp.com/doc/WCT101XARTDUG




Figure 11. Quality factor threshold example

5.7.1. Free-resonance Q factor

The free-resonance Q factor detection detects the dumping ratio of the resonance signal, as shown in

Figure 12. With the system’s high Q, driving just a few pulses near the resonant frequency are sufficient

to serve as impulses and start the system ringing. Collect the ADC data of the tank voltage (or coil

current) and get the decay rate of the signal.

Q=𝜋/(-ln(Rate))

Rate is the value of the decay rate of a resonance signal.

Figure 12. Resonance signal

Application monitoring and control using FreeMASTER



The circuit for the free-resonance Q measurement (which samples the signal on the resonance

capacitors) is shown in Figure 13.

Figure 13. Free-resonance Q measurement circuit

5.8. Coil selection

The Qi specification defines the MP-A9 as the more-than-one coil topology with one coil energized at a

time to realize the free-position charging.

The coil selection topology connects only one coil to the full-bridge inverter at a time. The coil is

equipped with the dual N-MOSFETs (Q9, Q12, or Q16), controlled by the WCT101xS controller

through the control interface based on low-power bipolar transistors.

5.9. Analog sensing

Some ADC0 and ACD1 ports of the WCT101xS are used to sense analog signals, such as temperature,

full-bridge input current, input voltage, and rail voltage.

6. Application monitoring and control using FreeMASTER

FreeMASTER is a user-friendly real-time debug monitor and data-visualization tool for application

development and information management. Supporting the non-intrusive variable monitoring on a

running system, FreeMASTER views the data from multiple variables in an evolving oscilloscope-like

display or in a common text format. The application can also be monitored and operated from the

webpage-like control panel.

6.1. Software setup

To set up the software, perform these steps:

1. Install FreeMASTER V2.0.2 (or later) from the NXP website (www.nxp.com/freemaster).

2. Plug the USB-UART converter board to the SCI connector J2, and connect the FreeMASTER

Micro-USB port to your computer.

3. Open the Device Manager, and check the number of the COM port.

http://www.nxp.com/freemaster




Figure 14. Device Manager

4. Unpack the embedded source code onto your local drive.

5. Start the FreeMASTER application by opening:

<unpacked_files_location>/CommonMWCT101xS_WCT_WCT15WTXAUTOS.pmp.

6. Select “Project –> Options”.

Figure 15. “Options”

7. Ensure that the virtual “Port” (according to Step 3) and “Speed” fields are set correctly.




Figure 16. Setting “Port” and “Speed” fields

8. Ensure that the MAP file is correct. The default directory is:

<unpacked_files_location>/sample_app_wct_GHS.elf.

Figure 17. Setting the MAP file

9. Connect the FreeMASTER.

Power on the MP-A9 and start the communication by clicking the “STOP” button in the

FreeMASTER GUI.




Figure 18. “STOP” button

6.2. Real-time application variables monitoring

FreeMASTER enables you to monitor and update all the application global variables. In this application,

several key variables are displayed in the scope windows. These variables are divided into different

blocks, as shown in Figure 19.

Figure 19. Real-time application variables

• “Power loss”—this block shows the variables and scopes with information about the power-loss

calibration, power-loss debugging, and current power-loss values.

• “Debug”—this block contains the debug values and scopes of ADC, FOD, temperature, Q factor,

and others.

• “Rx”—this block contains information about the receiver.

• “Board params”—this block contains current information about the board.

• “Tx”—this block lists the parameters of the transmitter.




• “Status & Errors”—this block contains information about the status and errors.

• “Samsung Fast Charge”—this block lists the status values of the Samsung fast charge-related

variables.

NOTE

Besides the variables above, all the global variables can be added to

FreeMASTER. How to generate and add variables to the watch window is

described in the FreeMASTER user manual.

6.3. Application parameters modification

The application parameters (NVM parameters) can be easily viewed and changed in the control panel.

The control panel contains the webpage elements (buttons, check boxes, and text fields) that provide a

user-friendly way to visualize and change the application control parameters.

Figure 20. Application variables

The application variables are divided into three tabs:

• “System Params”—parameters for system- and software-related settings.

• “Coil Params”—parameters for coils’ configuration and hardware-related settings.

• “Calibration”—group of parameters for input-current, input-voltage, and foreign-object-detector

calibration.

The meaning of each parameter is described next to its text field.

NOTE

The calibration parameters can be changed during run-time. The

parameters of “Op Params” don’t take effect immediately. To

modify the parameters in the “Op Params” page, enter the debug

mode, modify the parameters, and exit the debug mode. The

parameters then take effect.

Application monitoring through console



7. Application monitoring through console

The application sends some information and error states to the console through SCI. The information is

sent when the board is turned on, when the device is charging, or in case of an error state.

7.1. Software setup

1. Plug the USB-UART converter board to SCI connector J2, and connect the console Micro-USB

port to the computer.

2. Open Device Manager, and check the number of the COM port.

Figure 21. Device Manager

3. Run the communication program-supporting console (such as HyperTerminal or RealTerm).

4. Table 1 shows the communication setup.

Table 1. Port configurations

Port number Serial port from Device Manager

Baud 115200

Data bits 8

Stop bits 1

Parity None

Hardware flow control None

Display as ASCII

5. Open the port or start the communication, depending on the terminal used.

System bring-up



8. System bring-up

8.1. Ping sequences

When the low-power mode is disabled and no receiver is placed on the charging surface, the ping

sequence is as follows:

• Digital ping appears at about every 4.6 seconds in three batches.

• The following figures show the PWM waveforms of the digital ping sequence and ping patterns.

Figure 22. Digital ping batch

8.2. LED indication

The default LED display modes for different TX working states are shown in Table 2.

Table 2. LED display modes

LED No.

LED operational status

Standby Charging Charging

Complete

D fault TX fault RX fault

LED 1 (Red) Off Blink Off On On On

LED 2 (Green) Blink On On Off Off Off

The display pattern can be changed in DisplayUpdateLedStatus().

System bring-up



8.3. Debug messages

The system prints messages from a specified SCI port to inform you about what happened in the system.

The messages help you to understand the system working procedure and debug the issues.

• Message: DP

Prints the information about the digital ping.

• Message: ID

Prints the information about the board identification.

• Message: EXT

Prints the information about the extended identification.

• Message: NEG

Prints the information about the negotiation of new parameters.

• Message: XFER

Prints the information about the power transfer.

Document Number: WCT101XSV10AUG Rev. 0

10/2018

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