Renesas P9243-GB-EVK User manual

P9243-GB-EVK Evaluation Board User Guide
© 2020 Renesas Electronics Corporation
1
September 15, 2020
Description
The P9243-GB-EVK Evaluation Board demonstrates the features
oftheP9243-GB15WWirelessPowerTransmitter(TX)withafixed
frequency. It is intended to evaluate the functionality and
performance of the P9243-GB when combined with a Qi power
receiver in a wireless charging system. The P9243-GB-EVK offers
theflexibilitytoselectparameters,suchasQ-factorthreshold,LED
pattern, power loss FOD threshold, and external temperature
sensing function. The printed circuit board (PCB) has four layers,
and can be used with the user’s WPC-1.2.4 compliant receiver.
The high-efficiency, turnkey reference design is supported by
comprehensive digital resources to significantly expedite the
design-in effort and enable rapid prototyping.
Kit Contents
P9243-GB-EVK Evaluation Board
Adaptor: 18V/1.38A
Evaluation Board
Features
Power transfer up to 15W at receiver side
Wide input voltage range: 5V to19V
WPC-1.2.4 compatible, MP-A11 coil configuration
Supports system parameters configuration using GUI
Integrated drivers for external power MOSFETs
Embedded 32-bit ARM®Cortex®-M0 processor (trademark of
ARM, Ltd.)
Simultaneous voltage and current demodulation scheme for
WPC communication
Integrated current sense amplifier
Supports accurate 127.7kHzfrequency operation
Feedback control for external input step-down regulator
Dedicated remote temperature sensing
User-programmable power transfer LED indicators
User-programmable foreign objects detection (FOD)
WPC EPP-based Q-factor detection
Active-LOW enable pin for electrical on/off
Over-current and over-temperature protection
Supports I2C interface
Four-layer PCB assembled withtest points and coil fixture
-40°C to +85°C ambient operating temperature range
48-VFQFPN (6 × 6 mm)RoHS-compliant package

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Contents
Description.............................................................................................................................................................................................................1
Evaluation Board...................................................................................................................................................................................................1
Features................................................................................................................................................................................................................1
Contents................................................................................................................................................................................................................2
List of Figures........................................................................................................................................................................................................3
List of Tables.........................................................................................................................................................................................................4
Setup.....................................................................................................................................................................................................................6
Required or Recommended User Equipment...............................................................................................................................................6
Software Installation, Dongle Connectivity, and FLASH Programming with GUI..........................................................................................6
Software Installation............................................................................................................................................................................6
Dongle Connectivity.............................................................................................................................................................................7
Using GUI to Write to FLASH..............................................................................................................................................................8
Kit Hardware Connections............................................................................................................................................................................9
Usage Guide........................................................................................................................................................................................................10
Overview of the P9243-GB-EVK.................................................................................................................................................................10
Programming Interface...............................................................................................................................................................................10
Overview of the P9243-GB Wireless Power Pro GUI.................................................................................................................................11
System (Block Diagram) Tab.............................................................................................................................................................11
Config (Configuration) Tab................................................................................................................................................................11
FOD (Foreign Object Detection)Tab.................................................................................................................................................12
Program (Programming FLASH/OTP) Tab........................................................................................................................................13
Register (Manually Register Read/Write and Logging) Tab..............................................................................................................13
Generating a New HEX File..............................................................................................................................................................13
External Temperature Sensing (TS)...........................................................................................................................................................14
Control of External Power Stage DC/DC Buck Regulator– GPIO_B4 and GPIO_B7................................................................................15
Bypass External DC/DC Buck Regulator – GPIO_A4................................................................................................................................16
External Oscillator – GPIO_B5 and GPIO_B6............................................................................................................................................16
Quality Factor in Digital Ping Phase...........................................................................................................................................................18
Selection of Input Source and Operation Mode..........................................................................................................................................19
Transmitter Coil..........................................................................................................................................................................................20
List of Register for Default Configuration.............................................................................................................................................................20
Identification Registers...............................................................................................................................................................................20
Table 4. Read Register – Device ID Register...................................................................................................................................20
Table 5. Read Register – Firmware Revision...................................................................................................................................20
State and Status Registers.........................................................................................................................................................................21
Table 6. Read Register – State Register..........................................................................................................................................21
Table 7. Read Register – Error Code...............................................................................................................................................21
System Read-Only Registers.....................................................................................................................................................................22

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Table 8. Read Register – Input Current............................................................................................................................................22
Table 9. Read Register – Input Voltage ...........................................................................................................................................22
Table 10.Read Register – Operating Frequency...............................................................................................................................22
Table 11.Read Register – Transmitter Duty Cycle............................................................................................................................22
Table 12.Read Register – Receiver Reported Q-Factor Value.........................................................................................................22
Table 13.Read Register – Measured Q Factor Value........................................................................................................................22
Table 14.Read Register – Threshold Q Factor Value........................................................................................................................23
Table 15.Read Register – Potential Power .......................................................................................................................................23
Table 16.Read Register – Transmitter Power...................................................................................................................................23
Table 17.Read Register – Received Power ......................................................................................................................................23
Table 18.Read Register – FOD Threshold........................................................................................................................................23
Table 19.Read Register – Remote Temperature Sensing Voltage...................................................................................................23
Table 20.Read Register – Adaptor Type...........................................................................................................................................24
Configuration Registers..............................................................................................................................................................................24
Table 21.Read/Write Register – Tx Manufacture ID Adjust...............................................................................................................24
Table 22.Read/Write Register – Over Current Threshold Adjust.......................................................................................................24
Table 23.Read/Write Register – Low Voltage and Over Voltage Threshold Adjust...........................................................................25
Table 24.Read/Write Register – Over Temperature Threshold Adjust..............................................................................................25
Table 25.Read/Write Register – WPC Tuning Threshold Adjust.......................................................................................................25
Table 26.Read/Write Register – FOD Region Select Adjust.............................................................................................................26
Table 27.Read/Write Register – FOD Gain Select Adjust.................................................................................................................26
Table 28.Read/Write Register – FOD Offset Select Adjust...............................................................................................................27
Table 29.Read/Write Register – FOD Disable Adjust........................................................................................................................27
Table 30.Read/Write Register – LED Pattern Adjust.........................................................................................................................28
Table 31.Read/Write Register – Sleep Timer Adjust.........................................................................................................................28
Table 32.Read/Write Register – Q-Factor Adjust..............................................................................................................................28
P9243-GB EVB Application Schematic v1.0........................................................................................................................................................29
Bill of Materials (BOM).........................................................................................................................................................................................30
Board Layout.......................................................................................................................................................................................................34
Ordering Information............................................................................................................................................................................................38
Revision History...................................................................................................................................................................................................38
List of Figures
Figure 1. Windows Device Manager Display for Troubleshooting the USB Connection.....................................................................................6
Figure 2. System Tab of GUI..............................................................................................................................................................................7
Figure 3. Connecting the Dongle and Verifying GUI Connectivity......................................................................................................................7
Figure 4. USB-to-I2C Dongle Header of “USB-FTDI-V2-1” (FTDI) Dongle and “WPD-USB-Dongle”.................................................................8
Figure 5. P9243-GB-EVK Successfully Connected to GUI.................................................................................................................................8
Figure 6. FLASH Programming Procedure.........................................................................................................................................................9

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Figure 7. Evaluation Kit Connections using the P9415-R-EVK Receiver Evaluation Board...............................................................................9
Figure 8. P9243-GB-EVK V1.0 Evaluation Board Features..............................................................................................................................10
Figure 9. Sample Q-Factor Test Data...............................................................................................................................................................12
Figure 10. P9243-GB EVB v1.0 Evaluation Board Detail...................................................................................................................................13
Figure 11. TH_COIL1, R60, and RC67 Schematic Location..............................................................................................................................14
Figure 12. TH_COIL1, R60, and C67PCB Location..........................................................................................................................................14
Figure 13. Buck Regulator Schematic Location..................................................................................................................................................15
Figure 14. Buck Regulator PCB Location...........................................................................................................................................................15
Figure 15. Bypass Path Schematic Location......................................................................................................................................................16
Figure 16. Buck Regulator PCB Location...........................................................................................................................................................16
Figure 17. External Crystal Schematic Location.................................................................................................................................................17
Figure 18. External Crystal PCB Location..........................................................................................................................................................17
Figure 19. Q-factor Detection Schematic Location.............................................................................................................................................18
Figure 20. Q-factor PCB Location.......................................................................................................................................................................18
Figure 21. Input Source Selection Jumpers on the PCB....................................................................................................................................19
Figure 22. Silkscreen – Top of Board.................................................................................................................................................................34
Figure 23. Copper – Top Layer...........................................................................................................................................................................35
Figure 24. Copper L1 Layer................................................................................................................................................................................36
Figure 25. Copper L2 Layer................................................................................................................................................................................37
Figure 26. Copper Bottom..................................................................................................................................................................................38
List of Tables
Table 1. External Oscillator Selection..............................................................................................................................................................16
Table 2. P9243-GB-EVK Operation Modes.....................................................................................................................................................19
Table 3. Recommend Coil Manufacturer.........................................................................................................................................................20
Table 4. Read Register – Device ID Register..................................................................................................................................................20
Table 5. Read Register – Firmware Revision..................................................................................................................................................20
Table 6. Read Register – State Register.........................................................................................................................................................21
Table 7. Read Register – Error Code..............................................................................................................................................................21
Table 8. Read Register – Input Current...........................................................................................................................................................22
Table 9. Read Register – Input Voltage..........................................................................................................................................................22
Table 10. Read Register – Operating Frequency..............................................................................................................................................22
Table 11. Read Register – Transmitter Duty Cycle...........................................................................................................................................22
Table 12. Read Register – Receiver Reported Q-Factor Value........................................................................................................................22
Table 13. Read Register – Measured Q Factor Value.......................................................................................................................................22
Table 14. Read Register – Threshold Q Factor Value.......................................................................................................................................23
Table 15. Read Register – Potential Power ......................................................................................................................................................23
Table 16. Read Register – Transmitter Power..................................................................................................................................................23
Table 17. Read Register – Received Power .....................................................................................................................................................23

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Table 18. Read Register – FOD Threshold.......................................................................................................................................................23
Table 19. Read Register – Remote Temperature Sensing Voltage..................................................................................................................23
Table 20. Read Register – Adaptor Type..........................................................................................................................................................24
Table 21. Read/Write Register – Tx Manufacture ID Adjust..............................................................................................................................24
Table 22. Read/Write Register – Over Current Threshold Adjust......................................................................................................................24
Table 23. Read/Write Register – Low Voltage and Over Voltage Threshold Adjust..........................................................................................25
Table 24. Read/Write Register – Over Temperature Threshold Adjust.............................................................................................................25
Table 25. Read/Write Register – WPC Tuning Threshold Adjust......................................................................................................................25
Table 26. Read/Write Register – FOD Region Select Adjust............................................................................................................................26
Table 27. Read/Write Register – FOD Gain Select Adjust................................................................................................................................26
Table 28. Read/Write Register – FOD Offset Select Adjust..............................................................................................................................27
Table 29. Read/Write Register – FOD Disable Adjust.......................................................................................................................................27
Table 30. Read/Write Register – LED Pattern Adjust........................................................................................................................................28
Table 31. Read/Write Register – Sleep Timer Adjust........................................................................................................................................28
Table 32. Read/Write Register – Q-Factor Adjust.............................................................................................................................................28

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Setup
Required or Recommended User Equipment
The following additional lab equipment is required for using the kit:
P9415-R-EVK Receiver Evaluation Board or any WPC-1.2.4 compliant receiver
18V/1.38A power supply or QC3.0 provided by the user
REA USB-to-I2C Dongle(sold separately)
Software Installation, Dongle Connectivity, and FLASH Programming with GUI
Visit the P9243-GB-EVK webpage and download the latest version of theP9243-GB Wireless Power Pro GUI,USB drivers, andthe P9243-GB
A11a Configuration Flash HEX File. The software provides an intuitive graphical user interface for reading and writing to P9243-GB SRAM
registers and generate customuser configurations for the external Flash.
Software Installation
Follow these procedures to install the software:
1. Do not connect the USB-to-I2C dongle before installing the software.
2. Run the downloaded USB Drivers Setup executable file and follow the user prompts to install the USB drivers.
3. AfterfinishingthesetupoftheUSBdrivers,connectoneoftheUSB-to-I2CdonglestotheUSBport.WaitforafewmomentstoletWindows®
map the drivers for the dongle.
4. OpentheDeviceManagerfromtheWindowscontrolpanelandcheckthedeviceslistedunderthe“UniversalSerialBuscontrollers”section.
“FT4222H Interface A”and “FT4222H Interface B”should appear in this section as shown in Figure 1.
5. Download and extract the P9243-GB Wireless Power Pro GUISWR compressed file. To launch GUI, click the “Renesas Wireless Power
P9243-GB”Application.
Figure 1. Windows Device Manager Display for Troubleshooting the USB Connection

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Dongle Connectivity
Follow these procedures to establish GUI connectivity to the P9243-GB-EVK:
1. Launch the GUI program – Renesas Wireless Power P9243-GB. The initial screen of the GUI is shown in Figure 2.
Figure 2. System Tab of GUI
2. Set up the P9243-GB Evaluation Board by plugging the 5V adapter into J11 (Micro-USB connector) or the user’s power supply into VIN
(see Figure 4).
3. Connect the USB-to-I2C dongle to the computer and launch the P9243-GB Wireless Power Pro GUI. Once the dongle is detected, the
message“DongleDetected”willappearontheGUI.Ifthemessagedoesnotappear,unplugandplugtheUSBcableattheuser’scomputer.
4. Connect the USB-to-I2C dongle header to J4 of P9243-GB-EVK as shown in Figure 3.
Figure 3. Connecting the Dongle and Verifying GUI Connectivity
Dongle
Connectthe Dongle
toJ4 on the
P9243-GB-EVK
Message: Dongle Connected

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Figure 4. USB-to-I2C Dongle Header of “USB-FTDI-V2-1” (FTDI) Dongle and “WPD-USB-Dongle”
Blank
SCL
SDA
GND
SDA
SCL
GND
5. Press the “Connect to Device”button in the P9243-GB Wireless Pro GUI to connect to P9243-GB-EVK. Once P9243-GB-EVK is
recognized, the message “P9243-GB Connected”will appear (see Figure 5).
Note: To disconnect: Underthe File Drop-down menu →disconnect.
Figure 5. P9243-GB-EVK Successfully Connected to GUI
Press Connect to Device
Message: P9243-GB Connected
Using GUI to Write to FLASH
To update the P9243-GB-EVK firmware, follow these stepsand refer to Figure 6:
1. Enter the Program Tab of the GUI by Press Program.
2. Browse and select the firmwareHex file in Firmware Path.
3. Press Erase FLASH and accept the prompted messages.
4. Press Program FLASH and accept the prompted messages.
5. (Optional) Power cycle the P9243-GB, then press Verify FLASH and accept the promptedmessages.

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Figure 6. FLASH Programming Procedure
2. Browse and
Select HEX File
3. Erase FLASH
4. ProgramFLASH
1. ProgramTab
Kit Hardware Connections
Follow these procedures to setup the kit as shown on Figure 7.
1. Set up the P9243-GB-EVK Evaluation Board by plugging the 5V/2A adapter or the user’s power supply into J11 (Micro-USB connector).
Refer to Figure 8.
2. Ifusingthe P9415-R-EVKEvaluationBoardas thereceiver, connectwirestothe VOUTand GNDtestpointsontheP9415-R-EVKreceiver
to allow measuring the output voltage and applying a load.
3. Place the P9415-R-EVK orthe user’s receiver on the transmitter (TX) pad with the componentsfacing up as shown on Figure 7.
4. Verify that the two green LEDs identified in Figure 7 are illuminated indicating that coupling hasbeen established.
Figure 7. Evaluation Kit Connections using the P9415-R-EVK Receiver Evaluation Board
Green LED on P9243-GB-EVK
indicates that the wireless
connection hasbeen made Green LED on P9415-R-EVK
indicates that the wireless
connection hasbeen made
P9415-R-EVK
Receiver Board

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Usage Guide
TheP9243-GB-EVKfirmwareprovidesgreat flexibilityto customizeoperatingparametersfor customapplications.Defaultvalues ofthe P9243-
GB-EVK operating parameters, such as Digital Ping Frequency, FOD parameters, coil over-temperature sensing, and over current limit, are
configurableinthefirmwareandareloadedfromtheexternalFlashmemory.Basedontheendapplication,theP9243-GBoperatingparameters
can be configured by either writing to internal SRAM registers via the I2C interface, or by creating a new user configuration HEX file that can
be generated within the P9243-GB Wireless Power Pro GUI. Once the new user configuration HEX file is generated, the Flashmemory can be
erased and reprogramed with the P9243-GB Wireless Power Pro GUI. To customize the P9243-GB-EVK’s operating parameters in real-time,
use the P9243-GB Wireless Power Pro GUI software along with the USB-to-I2C dongle connected to J4 Header. For any production usages,
consult with REA before finalizing firmware.
Overview of the P9243-GB-EVK
Figure 8. P9243-GB-EVK V1.0 Evaluation Board Features
Input Select Jumpers
Tx Coil
Vin PowerConnnector: Micro-USB
Vin PowerConnnector: USB-C
Vin PowerConnnector: Barrel
Programming Interface
TheP9243-GBhasapre-programmedbootloaderthatmustbeusedinconjunctionwithanexternalflashmemorythatcontainscontrolfirmware.
The master P9243-GB accesses the slave external memory using a standard SPI interface (SCLK, MISO, MOSI, andSS pins) to upload the
firmware from the flash memory into the P9243-GB internal SRAM. This architecture allows the user to change the firmware in the external
flash to meet application-specific requirements. Renesas also provides firmware to implement standard WPC coil configurations, such as the
A11a addendum.
TheP9243-GBWirelessPowerProGUIcanbeusedforprogrammingtheexternalflashfile.TheW25X20CLUXIGistherecommendedexternal
flash memory. Smallermemory sizes intheW25X family can be used depending on the totalfirmware size. For recommendedflash memories,
please consult Renesas.

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Overview of the P9243-GB Wireless Power Pro GUI
System (Block Diagram) Tab
TheSystem tabof theP9243-GB WirelessPowerProGUI offersa dynamicvisual blockdiagramto expandthe knowledgebaseof thewireless
power system. This tab provides real-time information of input voltage, input current, transmitted power, power level of the receiver received,
power loss, operating frequency, operating duty, receiver identification number, and power contract type.
Config (Configuration) Tab
The Config Tab of P9243-GB Wireless Power Pro GUI offers users the flexibility to change operating parameters.Operating parameters, such
as Digital Ping Frequency/Duty, Operating Frequency/Duty limits, Rx Detection Sensitivity to lower quiescent currents in standby, over-current
sensing thresholds, LED1/2 patterns in specific events, Coil over-temperature sensing thresholds, Q-Factor threshold adjustments, and Error
mode alarm timer, can be configured in real-time. For more a detailed list of configurable parameters, open the P9243-GB Wireless Power Pro
GUI.Once the settings are configured to the user’s preference,a new configuration HEXfile can be generated. The usermust press Configure
to RAM before generating a new HEX file.
Digital Ping Voltage and Operating Frequency Adjustment
TheP9243-GB convergesall popularwirelesschargingprotocolsincludingWPCBaselinePower Profile(BPP),ExtendedPowerProfile (EPP),
up to 7.5W charging for iPhones, and Android proprietary fast charging modes. Depending onthe type and capability of the power supply, the
P9243-GB may operate in different modes. To support 7.5W charging for iPhone, Digital Ping Frequency and Max Operating Frequency must
remain at 127.7kHz in High Voltage mode only. It is not recommended to keep Low Voltage’s Digital Ping Frequency and Max Operating
Frequency at 127.7kHz.
Low Voltage and High Voltage Parameter Adjustment
The P9243-GB separates overlapped parameters into two separate modes: low voltage and high voltage. Low voltage parameters are
automatically loaded when theDC source is in the 5V sector. When operating in 5V sector, EPP mode is disabled. Additionally, a few selective
parameters are in further split into four sectors: 5V, 9V, 12V, and 16V. High-voltage parametersare automatically loaded when the DC source
is above the 5V sector.
WPC Max Voltage Tuning Adjustment
This parameter is applicable to EPP mode only. These adjustable parameters should be tuned according to WPC1.2.4 definedspecification in
Maximum Voltage (WPC1.2.4 Section 5.4.10) and Over Voltage Protection (WPC1.2.4 Section 5.4.11).
Once the P9243-GB recognizes a fast load dump, the bridge firmware protection will be triggered, whereby the bridge voltage will immediately
be fold-back. Once triggered, the PWM control for step-down converter will quickly jump to the target buck duty. The buck duty controls the
bridge voltage via GPIO_B7.
Q-Factor Adjustment
ThisparameterisapplicabletoEPPmodeonly.Priortoeachdigitalping,theP9243-GBdetectsandmeasuresthecoil’squalityfactor(Q-factor).
If an EPP receiver is present, the transmittercompares its own measured Q-factor with the reference Q-factor provided by the EPP receiver. If
the difference is considerably large, the P9243-GB will identify this situation as a WPC-defined FOD being present and cannot move on to the
PowerTransferPhaseforthepurposeofsystemprotection.Toaidinrecognitionofdevicesplaceduponthecoilpadsurface,itisrecommended
toset DigitalPingInterval toat least10 andAnalog PingInterval toatleast80ms.The defaultscan bedefined basedon test.Based onsample
test, a typical example of an adjusted threshold and its trend line is shown in Figure 9.

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Equation 1
(QThreshold)=(QRx)×
 QFOD
Equation 2
(Q Factor) < (Q Threshold)
Where:
QFactor =Value of Q returned by P9243
QThreshold =Calculated Q threshold to trigger QFOD
QRx =Reported Q value of Receiver
QFOD =Gain used in Q Threshold calculation
QFOD =Offset used in Q Threshold calculation
Figure 9. Sample Q-Factor Test Data
DUT1 DUT2 DUT3 DUT4 DUT5 DUT6 DUT7 DUT5+FO3 DUT5+FO4 DUT6+FO3 DUT6+FO4
Q-Factor and Q-Threshold vs. DUT
Q-Factor(P9243)
Q-Threshold
Q
FOD (Foreign Object Detection) Tab
The FOD tab of the P9243-GB Wireless Power Pro GUI allows users to adjust the FOD thresholds in real-time. Based on experimentation of at
least3pointswithandwithoutaforeignobjectpresent,agraphicvisualizationaidisprovidedtohelpwiththetuningprocess.TheFODthreshold
can be automatically generated using the Auto Calculate button, or it can be manually generated using the Manual Adjust button. Once the
settings are configuredto the user’s preference, a new configuration HEX file can be generated. The usermust press Configure to RAM before
generating a new HEX file.
The P9243-GB separates theFOD parameters into three operating modes: BPP, EPP (5W), and EPP.

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Program (Programming FLASH/OTP) Tab
The Program tab of the P9243-GB Wireless Power Pro GUI allows users to program FLASH and/or OTP memory. The FLASH and/or OTP
memory of the P9243-GB-EVK can be verified with a loaded HEX file in the Firmware Path. From an already programmed P9243-GB, the
firmware Hex file can also be extracted and saved to a local target.
Register (Manually Register Read/Write and Logging) Tab
The Register tab of the P9243-GB Wireless Power Pro GUI allows users to manually log registers up to 32 bits to a maximum of 10 registers
at any time. Data Rate and Log Display Format is configurable. Manually Read and Write is also offered in this section.
Generating a New HEX File
It is recommended to complete these steps when generating a HEX file:
1. Program the P9243-GB-EVK with the latest HEX Configuration File from the Renesas website. Start with a golden base hex file first. It is
not recommended to daisy-chain the HEX files.
2. Read the defaults before overwriting any parameters by pressing Read Configurations.
3. Enter the desired field value and press Configure to RAM.
4. Confirm acceptance of the desired field value by pressing Read Configurations.
5. Press Generate HEX firmware to create a new HEX file.
Before finalizing firmware for production use, please consultRenesas.
Figure 10. P9243-GB EVB v1.0 Evaluation Board Detail
HighVoltage Input OVP Circuit
External Flash
Buck Power Stage Filter
Buck IC
Buck Feedback Circuit
P9243-GB IC
External Cystal Circuit
Resonant Capacitors
Q-factor Detection Circuit
Note: The P9243-GB has the bootloader and application firmware pre-programmed into the internal one-time programmable (OTP) memory
and does not allow users to customize the firmware. The P9243-GB, which is pin-to-pin compatible with the P9243-G, has only a bootloader
pre-programmed into the internal OTP memory. Therefore, the P9243-GB must be used in conjunction with an external flash memory.
Application firmware is loaded into the external flash for specific system requirements.
The P9243-GB fetches the application firmware from the external flash memory using an SPI interface and executes the code. Users can
customize the firmware in external flash and load the new firmware in the flash via the P9243-GB I2C port. The Winbond W25X20CLUXIG is
the recommended external flash memory to be used with the P9243-GB.

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External Temperature Sensing (TS)
The P9243-GB includes an optional temperature sense input pin, TS, that is used to monitor a remote temperature, such as for a coil or a
battery charger. The TS pin voltage can be calculated using Equation 3.
Equation 3
VTS = VLDO33 × NTC
(NTC + R60)
Where:
NTC Thermistor’s resistance (TH_COIL1)
R60 Pull-up resistor connected to the 3.3V supply voltage on the P9235A-RB Evaluation Board
The over-temperature shutdown is triggered if the voltage on the TS pin is lower than the threshold. To view default thresholds, launch the
P9243-GB Wireless Power Pro GUI. The TH_COIL1 is not populated on the P9243-GB-EVK Evaluation Board.
Figure 11. TH_COIL1, R60, and RC67 Schematic Location
Figure 12. TH_COIL1, R60, and C67 PCB Location

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Control of External Power Stage DC/DC Buck Regulator – GPIO_B4 and
GPIO_B7
The P9243-GB is specially designedto support fixed-frequency operation as described in the WPC MP-A11 coil configuration with an external
input step-down buck regulator. The P9243-GB-EVK uses the on-board MP2229 Buck IC to adjust the powertransferbetween the transmitter
and receiver. The MP2229 operates at a fixed 500kHz frequency on the board. The Buck regulator power stage is designed to accommodate
a wide range of input voltages. The feedback loop combined with the external PWM signal are designed for the MP2229, and are not
recommended to be changed. The resolution of the MP2229 is about 35mV. The Buck and external components in the PCB layout should be
isolated from any noise generating circuits.
For Apple 7.5W charging mode, the P9243-GB supports fixed and precise switching frequency at 127.7kHz, and thus its bridge input voltage
must be adjusted. Another stage of theexternalbuckregulatoris added to regulate the input voltage of the full bridgeLC circuits. GPIO_B4 is
used to enable/disable thisexternal DC/DC buck regulator. GPIO_B7 generates a PWM signalthat is applied on top of the feedback pin of the
buckregulatorthrougha low-passfiltertofine-tune theoutputvoltageofthebuckregulator.Theresolution ofthebuckregulatoroutputdepends
on the buck IC’s internal reference voltage, output voltagerange, buck regulator compensation design, and resolution of the PWM signal from
GPIO_B7.
Figure 13. Buck Regulator Schematic Location
Figure 14. Buck Regulator PCB Location

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Bypass External DC/DC Buck Regulator – GPIO_A4
Whenthe inputvoltage is5V only,theP9243-GBoperates intheBPP Mode.However,enablingthe externalpower stagebuckregulatorat this
time compromises the efficiency, thermal performance, and maximum power that can be delivered to the receiver. Under such an application
scenario, the P9243-GB will disable the external power stage buck regulator and enable another power path for the input voltage (5V) to be
directly applied to the DC/AC inverter. GPIO_A4 is used to bypass the external power stage buck regulator. In this mode, the device operates
ina modefor afixedinput voltagewith variablefrequency.Theoperatingfrequency rangedependson theWPCcoil configurationspecification.
Figure 15. Bypass Path Schematic Location
Figure 16. Buck Regulator PCB Location
External Oscillator – GPIO_B5 and GPIO_B6
To guarantee that the operatingfrequency is precisely at 127.7kHz under different temperature conditions, the P9243-GB requires an external
oscillator to provide accurate frequency operation. The PLL and crystal driver circuits inside theP9243-GB guarantee that the internal clock for
the ARM®Cortex®-M0 core is synchronized with the external oscillator frequency.
An external 8MHz crystal must be connected between GPIO_B5 and GPIO_B6.
Table 1. External Oscillator Selection
Type Vendor Part Number Typical Frequency (MHz)
Crystal Oscillator ECS Inc. ECS-80-18-30B-AGN-TR 8MHz + 30ppm

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Figure 17. External Crystal Schematic Location
Figure 18. External Crystal PCB Location

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Quality Factor in Digital Ping Phase
Before each digital ping, the P9243-GB detects and measures the coil’s quality factor (Q-factor). If an EPP receiver is present, the transmitter
compares its own measured Q-factor with the reference Q-factor provided by the EPP receiver. If the measured Q-factor is lower than the
calculated threshold based on the Receiver’s reference Q-factor value, the P9243-GB will identify this situation as a WPC-defined FOD being
presentand cannotcontinueon tothePowerTransfer Phaseforthe purposeofsystemprotection.Thedefault Q-factordetectionthreshold can
be adjusted using the P9243-GB Wireless Power Pro GUI.
The method implemented by the P9243-GB to detect the Q-factor is completely based on the nature of the LC resonant circuit. The transmitter
LC resonant tank is firstcharged by a low voltage DC source toensure thattheRx will not be powered up by using a small amount of energy.
Until there is no AC current flowingfrom the DC source to the LC tank, the DC source voltage will be removed and the LC tank will be shorted.
The energy previously stored inthe LC resonant tank circulatesbetween the coil and capacitorsand generates resonant ringing naturally. The
frequency and envelope of the resonant ringing are directly related to the Q-factor. Thus, the Q-factor can be calculated by detecting the
envelope of the ringing with thecircuit in Figure 19.
The P9243-GB-EVK has implemented the Q-factor detection for WPC EPP receivers. The Q_DEC pin is used to sample the voltage on the
coil. Figure 20 shows the Q-factor detection circuits.
Figure 19. Q-factor Detection Schematic Location
Figure 20. Q-factor PCB Location

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Selection of Input Source and Operation Mode
The P9243-GB-EVK supports different types of AD/DC adaptors and connectors. By selecting the jumpers in Figure15, the user can selectthe
USB-Micro connector, USB-C connector, or DC jack adaptor.
Figure 21. Input Source Selection Jumpers on the PCB
The P9243-GB-EVK supports a wide range of input DC sources from 5V to 19V. Based on the input source, the P9243-GB-EVK supports
different types of receivers. Table 2 lists the P9243-GB-EVK operation modes.
Table 2. P9243-GB-EVK Operation Modes
Input Voltage/Current Rating Receiver Supported Operating Frequency
5V/2A BPP (Bypass External Buck Regulator) 110k – 148k
9V/1.67A
BPP 5W
110kHz – 127.7kHz
EPP, up to 8W
Up to 7.5W charging for iPhones
12V/2A
BPP 5W
EPP, up to 10W
Samsung AFC
Up to 7.5W charging for iPhones
15V to 19V/1.8A
BPP 5W
EPP, up to 15W
Samsung AFC
Up to 7.5W charging for iPhones

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Transmitter Coil
The MP-A11 coils in Table 3 are recommended to be used withthe P9243-GB transmitter for 15W applications for optimum performance. The
recommended vendor has been tested and verified.
Table 3. Recommend Coil Manufacturer
Output Power Vendor Part Number Inductance at 100kHz Typical DCR at 25ºC
15W SUNLORD MQQTC505030S6R3 6.3uH 38mΩ
15W CYNTEC WTCL05054F-6R3ABKS-70 6.3uH 38mΩ
List of Register for Default Configuration
The P9243-GB uses the standard I2C slave implementation protocol to communicate with a host AP or other I2C peripherals. The
communication protocol is implemented using 8 bits for data and 16 bits for addresses. The default slave address of the P9243-GB is 61HEX.
The address of each register is 16 bits. Note that some values require multiple registers and therefore span multiple addresses. For example,
the address of the device ID high byte is 0001HEX and the low byte address is 0000HEX.
The following tables listaddress locations, field names,available operations (R or RW), default values, andfunctional descriptions of internally
accessible SRAM registers contained within the P9243-GB. The registers are loaded each time the device is powered and cannot be changed
exceptbynew firmwareprogrammedintotheexternal Flashdevice.TheSRAMregisters areavailabletomakesettingchangesafterthedevice
is powered. These changes are reset to default when the poweris cycled or the device is reset. Below are the commonly usedSRAM registers
for the system configuration or debug.
Identification Registers
Table 4. Read Register – Device ID Register
Address and Bit Register Field Name R/W Default Function and Description
0000HEX Device_ID [15:0] R 9243HEX Device ID.
Table 5. Read Register – Firmware Revision
Address and Bit Register Field Name R/W Default Function and Description
0540HEX Customer_Code [7:0] R - Customer code.
0541HEX Project_Code [7:0] R - Project code.
0542HEX FW_Major_Rev [7:0] R - Major firmware revision.
0543HEX FW_Minor_Rev [7:0] R - Minor firmware revision.
0544HEX Month_Code [7:0] R - Month firmware revision.
0545HEX Day_Code [7:0] R - Day firmware revision.
0546HEX Year_Code [7:0] R - Year firmware revision.