15 W 3-coil Fixed Frequency Qi-certified Wireless Charger TX Evaluation .

UM2491Erasing firmware procedure using STVPFigure 17. STVP configurationFollow this procedure if you encounter problems during a firmware update, such as corrupted firmware code.Step 1.Step 2.Step 3.Step 4.UM2491 - Rev 3Power OFF the target.Power ON the target.Connect ST-LINK circuit to the PC via USB.Connect the ST-LINK–SWIM cable to the target.Pay special attention to ensure that the SWIM cable is correctly connected to the transmitter board.Refer to the figure below.page 17/81

UM2491Erasing firmware procedure using STVPFigure 18. ST-LINK connection on the boardStep 5.Step 6.Launch STVP software program.Select the STM8AF6166 core from the drop-down list at the top.Figure 19. STVP core selectionStep 7.Step 8.Do not load any programs into the STVP RAM area as all bits are erased (load 00 00 00 )Transfer the "00 00" to the STWBC-MC through the SWIM interface using the download button.Figure 20. STVP downloadStep 9.UM2491 - Rev 3Click [OK] if the following message appears.page 18/81

UM2491Erasing firmware procedure using STVPFigure 21. STVP wrong device selected alertStep 10. Click [Yes] if the following message appears.Figure 22. STVP incompatibility device action queryStep 11. After this operation, the programming procedure starts.On completion, the following STVP message appears. PROGRAM MEMORY programming completed. Verifying PROGRAM MEMORY area. PROGRAM MEMORY successfully verified.Step 12. Exit the STVP program.Step 13. Disconnect the SWIM cable.Step 14. Power OFF the transmitter board.Once the procedure is complete, you can proceed to retry the UART download procedure if necessary.UM2491 - Rev 3page 19/81

UM24913.4Firmware download with command line3.4.1Firmware download with written chipStep 1.Step 2.Create a dedicated directory with the following files:STWBC Loader.exe–stwbc loader not empty.bat––enable boot.bin–“firmware version“.cabFrom the STSW-STWBCGUI folder, call the "stwbc loader not empty.bat" file from the command line.When you call the batch file, you must also specify:–COM number (e.g. COM2)–File name ("firmware name.cab")Figure 23. STSW-STWBCGUI command line3.4.2Firmware download with blank chipIf the STWBC-MC memory is erased, use the procedure below.Step 1.UM2491 - Rev 3Connect the UART cable to the board.page 20/81

UM2491STVP file creationStep 2.Step 3.From the STSW-STWBCGUI folder, call the "stwbc loader empty.bat" file from the command line.When you call the batch file, you must also specify:–the COM number (e.g., COM6)–the file name (firmware name.cab)Execute the command line as shown in the example below, with the appropriate firmware file name.Figure 24. STSW-STWBCGUI command line with blank chipNote:If the COM port is COM8, use the syntax \\.\COMx, where COMx is the COM port number.Note:A dedicated tool is available for simultaneous downloads (refer to the STSW-STWBCFWDT firmwaredownloader tool).3.5STVP file creationTo use the STVP to download, you must generate new files from the *.cab via the STSW-STWBCGUI.Step 1.Select the convert CAB to STVP files command from the STSW-STWBCGUI setup menu.Figure 25. STSW-STWBCGUI: convert CAB to STVP filesStep 2.UM2491 - Rev 3Follow the prompt to select the appropriate cab file.page 21/81

UM2491Firmware download with STVPFigure 26. Selecting the CAB file to be convertedStep 3.Follow the prompt to provide the project file name.Figure 27. Selecting the STVP project file nameFour files are generated as shown below.Figure 28. STVP project filesNote:Refer to STSW-STWBCFWDT STWBC firmware downloader tool for further details.3.6Firmware download with STVPFollow the procedure below to download firmware using the STVP software program.UM2491 - Rev 3page 22/81

UM2491Firmware download with STVPNote:You can also install and use the IAR toolchain to compile and download firmware.Step 1.Step 2.Step 3.Step 4.Target power OFF.Target power ON.Connect ST-LINK circuit to the PC via USB.Connect the ST-LINK–SWIM cable to the target.Pay special attention to ensure that the SWIM cable is correctly connected to the transmitter board.Refer to the figure below.Figure 29. ST-LINK connection on the boardStep 5.Step 6.Launch STVP software program.Select the STM8AF6166 core from the drop-down list at the top.Figure 30. STVP core selectionStep 7.UM2491 - Rev 3Go to [Project] [Open] and select the .stp file provided in the zip file.page 23/81

UM2491Firmware download with STVPFigure 31. STVP open projectStep 8.After a few seconds, the following message should appear.Loading file program.hex in PROGRAM MEMORY area . File successfully loaded. File Checksum 0x1D1205Note:It is normal for warnings like the ones below to appear: Loading file options.hex in OPTION BYTE area .FILE : line 2: Address 0x4802 is out of range and is ignored!FILE : line 2: Address 0x4804 is out of range and is ignored!Step 9.Step 10. Select [Program] [All tabs (on active sectors, if any)]Figure 32. STVP downloadStep 11. Click [OK] if the following message appearsFigure 33. STVP wrong device selected alertStep 12. Click [Yes] if the following message appearsUM2491 - Rev 3page 24/81

UM2491Firmware download with STVPFigure 34. STVP incompatibility device action queryStep 13. After this operation, the programming procedure starts.Step 14. On completion, the following message appears PROGRAM MEMORY programming completed. Verifying PROGRAM MEMORY area. PROGRAM MEMORY successfully verified.Step 15. Exit the STVP software program.Step 16. Disconnect the SWIM cable.Step 17. Power OFF the trnasmitter board.UM2491 - Rev 3page 25/81

UM2491Setting up the evaluation equipment4Setting up the evaluation equipmentFigure 35. Test setup configurationAHalfbridge12 VVINA UTPOWERRECEIVERThe board is powered with an external power supply or with a USB charger. An electronic load is connected onthe receiver output to provide a load up to 15 W. Voltmeters and ammeters measure input and output voltage andcurrent.4.1How to supply power from an external sourceFollow this procedure to supply power from an external power source.Step 1.Step 2.Step 3.Set your power supply:–12V/2A for EPP Mode–5V/2A for BPP ModeSet jumper J100 for jack/external power supply input.Connect the external power to the board with wires.Figure 36. Power supply connection4.2How to supply power via USBFollow this task to supply power through the USB charger.UM2491 - Rev 3page 26/81

UM2491How to set up a UART connectionWarning:Step 1.Step 2.Disconnect the PC micro-USB cable before connecting USB-C cable.Set jumper J100 for USB power supply input.Select the type of USB charger you are going to use:–a simple 5V/2A USB charger (BPP mode only)–a 30 W USB-PD wall charger (supports EPP Mode) to provide 15 W on the receiver side. Bydefault, communication on CC lines selects 20 V on VbusTesting by ST was performed using the UGREEN 30W USB-C PD power adapter: Model 127.Note:It is important to use a good quality USB-C cable between the charger and the board.Figure 37. Power supply connection1. QC charger2. USB-C cable3. Transmitter4. J100 jumper to select input supply type1234.34How to set up a UART connectionA UART connection between the board and your PC is necessary to be able to set parameters and monitor thetransmitter board through the STSW-STWBCGUI software.Step 1.UM2491 - Rev 3connect the USB connector on the USB to UART cable from the USB to UART dongle on your PC toconnector J400 on the board.page 27/81

UM2491How to set up a UART connectionFigure 38. UART connection1. USB to UART dongle2. J400 connector12UM2491 - Rev 3page 28/81

UM2491GUI and evaluation procedure5GUI and evaluation procedureThe STSW-STWBCGUI lets you monitor STWBC-MC operation. The main screen provides transmitter and Qireceiver status information.Step 1.Launch the STSW-STWBCGUI user interface software.Figure 39. STSW-STWBCGUI main window1. Transmitter state section2. Power mode indicator3. Protocol and Monitor debug window buttons4. Parameter window button13Step 2.UM2491 - Rev 324From the launch screen, select the [Protocol window] button.This window shows Rx to Tx communication protocol errors, useful for system debugging.page 29/81

UM2491GUI and evaluation procedureFigure 40. STSW-STWBCGUI Qi protocol windowStep 3.UM2491 - Rev 3From the launch screen, select the [Monitor window] button.This window lets you monitor STWBC-MC internal variables such as bridge voltage and frequency, Rxreported power, coil temperature, etc.page 30/81

UM2491GUI and evaluation procedureFigure 41. STSW-STWBCGUI: monitor windowStep 4.Note:UM2491 - Rev 3From the launch screen, select the [Param window] button.This window lets you adjust system parameters (thresholds, regulation error) and save the settings.The parameters have the following levels of protection:–Level 0: parameters can be modified without protection–Level 1: To modify these parameters, you must first click the [Unlock param] button.Exercise caution when modifying level 1 parameters, as they can lead to system malfunction and triggerbehavior that is not compatible with the Qi standard.page 31/81

UM2491GUI and evaluation procedureFigure 42. STSW-STWBCGUI parameter windowStep 5.Change some parameters and test their impact immediately by clicking [Push to target].Modified parameters lose their highlighted background.Figure 43. STSW-STWBCGUI: parameter modificationUM2491 - Rev 3page 32/81

UM2491GUI and evaluation procedureThe GUI includes the STSW-STWBCFWDT downloader interface (which uses the UART connection) and includes tools togenerate binary files with your changed parameters and to build new firmware packages with these files. Through the GUI, youcan change the parameters and produce a new cab to program a batch of new boards.Step 6. In the Parameters window, select [Dump to bin.] to save the changed parameters to a bin file.You should only do this after you have clicked the [Push to target] button.Figure 44. STSW-STWBCGUI dump modified parameters to a bin fileStep 7.UM2491 - Rev 3From the launch screen, select [Setup] [Modify parameters in CAB file] and select the appropriatefirmware CAB file to be patched.This operation will alter the firmware file with new tuning parameters, which can be subsequentlyloaded using the standard procedure.page 33/81

UM2491Status LEDsFigure 45. STSW-STWBCGUI: CAB file patch button5.1Status LEDsThe status LEDs give the state of the charge:At startup Red short blinking: when the board auto-calibration is on-going. You have to wait for the LED to be switchedoff before putting a receiver on the surface.Red and green blinking once: an internal reset occurred. Red and green steady state: firmware/STWBC chip mismatch Red steady and after 2 seconds green steady state: board hardware subversion detected does not matchthe firmwareIn steady state Green blinking: power transfer in progress Green steady state: the charge is complete Red blinking: an error has been detected, as incomplete charge due to battery fault, overvoltage,overcurrent, etc. Red steady state: the transmitter is stuck until the receiver is removed, as mentioned in the Qi standard(power transfer stopped three times in a row due to the amount of power not provided to the receiver, sometypes of end power transfer or no response error code)UM2491 - Rev 3page 34/81

UM2491Test procedure for board calibration5.2Test procedure for board calibrationImportant:Board calibration is mandatory to ensure that the transmitter board functions properly. You must perform thenecessary calibration routines only once after each new firmware download.Step 1.In the STWBC GUI launch screen, select [Test] [Manage test].Figure 46. Start auto calibrationProceed with the following test routine:1.Presence detection calibration5.2.1Presence detection calibration procedureStep 1.In the Test popup window, insert "1" in the [Test number:] field and click the [Start] button.Figure 47. Presence detection testAt the end of the test, the [TEST COMPLETED] field is set in the Protocol window and [Test done] appears inthe [Status:] field of the Test window.UM2491 - Rev 3page 35/81

UM2491Test procedure for board calibrationFigure 48. Test resultIf the test completion confirmations do not appear, please start the test again.Proceed with the following test routine:1.QFOD calibration5.2.2QFOD calibration procedureStep 1.In the Protocol window, click the [Clear] button.This clears the [TEST COMPLETED] field.Figure 49. QFOD testStep 2.In the Test popup window, insert "2" in the [Test number:] field and click the [Start] button.At the end of the test, the [TEST COMPLETED] field is set in the Protocol window and [Test done] appears inthe [Status:] field of the Test window.UM2491 - Rev 3page 36/81

UM2491EfficiencyFigure 50. Test resultIf the test completion confirmations do not appear, please start the test again.5.3EfficiencyEfficiency measurements are performed on a Qi certification tester.The STEVAL-ISB047V1T transmitter board is supplied with 12 V/2 A, and the receiver voltage level is 12 V(MP1B).Pout is the actual output power measured at the output of the receiver and Pin is the input power.Efficiency is measured using the configuration setup below:Figure 51. Efficiency set upAHalfbridge12 VVINA UTPOWERRECEIVERThe following figure shows the typical efficiency performance on the different coils.UM2491 - Rev 3page 37/81

UM2491Standby consumptionFigure 52. Efficiency performanceEfficiency Pout/Pin.Max efficiency is 75% at 9 W5.4Standby consumptionVery low power consumption is achieved in Standby Mode, with the transmitter board supplied 12 V.Device detection is still enabled in this mode, but power consumption is reduced down to 1.4 mA on average. TheSTEVAL-ISB047V1T reference board can operate on a low standby power consumption of only 17 mW.Note:UM2491 - Rev 3To measure such low power consumption, the UART cable must be unplugged.page 38/81

UM24916Schematic diagrams6.1STEVAL-ISB047V1T schematic diagramsFigure 53. STEVAL-ISB047V1T - circuit schematic (supply)VIN USB PDTP100WIRE PJ-002A132R100220KC100TP101NPWIRE F25VX5RVBUSC106100NF50V R101X5R 5R10NF50VX7R4VINVOUTGNDFBVDD VX5R100NF25VX5RR103120KNPFigure 54. STEVAL-ISB047V1T - circuit schematic (sepic)Isat 6A, Rdc 23mOhmsWURTH FX5R 50VPMEG045V100EPDR2031KC20310UFVINQ200DCDC DRVX5R2R200110R454NPN-PNP2VIN6187C219100NFC0G UF35VX5R22UF35VX5R22UF35VX5R 3470RR2060.033R1/2WDCDC DACR21210KR2133.3KR2144.7KUM2491 - Rev 3CMP OUT VCS F50VX7RDCDC DAC REFC218220NF16VX7Rpage 39/81

UM2491Schematic diagramsFigure 55. STEVAL-ISB047V1T - circuit schematic (bridge)VDCDCQ302N-MOS2N70023D1PWM LLH5BRIDGE NODETHLDRVR301 22R4123449GNDMCP14700R300 22R123PHASE 1LOWDRV 5PWMLOX7RHDRVC3041NF50VX5R5678DNBLHIGHDRV 8PWMHI5678C303 100NFBOOT 725V3VDCDC6VCC2R303NPNPU300UPBLR30422RD300NPVDD P300Direct GND lineconnectionGND POWERFigure 56. STEVAL-ISB047V1T - circuit schematic (controller)VDD STWBC272821242552DCDC DRVDCDC DACUPBLDNBLPWM QFODJ400USB VCCUSBDMUSBDPIDUSB GNDSWIMNRSTDNBL FBI2C SDAI2C SCLDCDC DRVDCDC DACUPBLDNBLPWM QFODCMP OUT VCS CMPDCDC DAC REFWAVE SNSCURRENT DEMODU400STWBC MCR414R41510RUSB DMUSB DP32167STROBE SR10RR405100KR406100KUART TXUART RXLEDQC IO22232634TP406VSSVSSTP403 TP404DNBLVDD STWBCI2C SDAI2C SCL89101112CMP OUT VCS CMPDCDC DAC REF151617181920R4031MR404WAVE SNSCURRENT DEMOD1KVDD STWBCVDD STWBCR407180KTANK VOLTAGEVTARGETQFOD ADCJ401VDD STWBCSWIMISENSEVBUSC40410NF50VX7R143330USB for UART DebugTANK VOLTAGEVTARGETQFOD ADCCOIL TEMPISENSEVMAINR40210KDEMAGNETSYMBOL BOL F16VX5RVDD TWBC-MCDigital 1121VDD 1Q2Q3Q4Q5Q6Q7QS1QS2VDD STWBCD400RED1456714131211COIL 1 SELCOIL 2 SELCOIL 3 SELD401GREENR411 470RQC IOR412470R9108VSSI2C SDAI2C SCL1VDD15STROBE SRVDD STWBCTP40516R410100KUM2491 - Rev 3page 40/81

UM2491Schematic diagramsFigure 57. STEVAL-ISB047V1T - circuit schematic (sensing)VDD STWBCR5001MR502R50147KQFOD SENSEQFOD ADC0RVDD STWBCVDD 0470pF50VX7RUM2491 - Rev 34One nF50VX7RR50810Kpage 41/81

UM2491Schematic diagramsFigure 58. STEVAL-ISB047V1T - circuit schematic (demod)R600470KVDD STWBCVDD VQ600AR605NODE SYMBOL BC847CDW1T1GQ600BR606100KTP60031R602SYMBOL VDD STWBCC606C607100NF25VX5R2.2UF25VX5RVDD STWBCU6001 INR6101MV 5R611 2 V-C60822PF50VC0G3 -IN-100KOUT ODCURRENT DEMODR61222K2C6113R613330RUM2491 - Rev 3100NF50VX5R1D600BAV99Wpage 42/81

UM2491Schematic diagramsFigure 59. STEVAL-ISB047V1T - circuit schematic (mechanical parts)M718M719M720M721M316 KRSTMCZ100M316 KRSTMCZ100M316 KRSTMCZ100M316 M708SPACER 3MM MP A8 2MNx0,6MNx33MTP702DOUBLE COAT ACRYLIC FOAM ADHESIF 70911111HTSB-M3-20-5-1SPACER 3MM MP A8 BOTT

TP1100 Coil 3 Coil 3 connection TP1101 Coil 3 bridge Coil 3 connection 2.2 STWBC-MC pinout and pin description for 3-coil MP-A15 configuration The STWBC-MC is a multifunction device that can support several wireless charging architectures. This section shows the pinout used by the digital controller when the 3-coil MP-A15 configuration is used .