ST STEVAL-ISB044V1 User Manual

October 2017

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www.st.com

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User manual

Getting started with the Qi MP-A10 wireless charger Tx

evaluation board based on STWBC-EP

Introduction

The STEVAL-ISB044V1 wireless power transmitter evaluation board is based on the MP-A10 (CR419)
wireless power consortium (WPC) standard version 1.2.3 and supports FOD (foreign object detection).

The transmitter supports all Qi-compatible receivers (such as those in Qi- enabled mobile phones) as
well as resistive or capacitive modulation receivers.

In accordance with the Qi-MPA10 topology, the STEVAL-ISB044V1 supports a 5-13 V input voltage and
a half-bridge stage with bridge voltage/frequency control.

The evaluation board is based on the STWBC- EP controller which integrates all the functions required
to drive and monitor the transmitter, and controls the bridge voltage built in boost topology.

The STWBC-EP supports UART connectivity to a PC and, thanks to the STEVAL-ISB044V1 graphical
interface, monitors the transmitter behavior in real-time.

The STEVAL-ISB044V1 reference design provides a complete kit which includes the STWBC-EP,
firmware, layout based on cost- effective 2-layer PCB, graphical interfaces and tools.

Figure 1: STEVAL-ISB044V1 evaluation board

Contents

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Contents

1 Getting started ................................................................................. 7

1.1 System requirements ........................................................................ 7

1.2 Package contents .............................................................................. 7

2 Hardware description and setup .................................................... 8

2.1 System block diagram ................................................................ ....... 8

2.2 STEVAL-ISB044V1 wireless transmitter board overview .................. 8

2.3 STWBC-EP pinout and pin description ........................................... 11

3 Download procedure ..................................................................... 13

3.1 STSW-STWBCGUI software installation ......................................... 13

3.2 Firmware download via STSW-STWBCGUI ................................... 14

3.2.1 Download procedure with a new chip (never been programmed) ... 14

3.2.2 Firmware upgrade procedure (chip already programmed) ............... 17

3.3 Erasing firmware procedure using STVP ........................................ 18

3.3.1 Requirements ................................................................................... 18

3.3.2 Procedure ......................................................................................... 19

3.4 Firmware download with command line .......................................... 20

3.4.1 Firmware download with written chip ............................................... 20

3.4.2 Firmware download with blank chip ................................................. 21

3.5 STVP file creation ........................................................................... 21

3.6 Firmware download with STVP ....................................................... 23

4 Evaluation equipment setup ......................................................... 26

4.1 External power supply ................................................................ ..... 26

4.2 USB charger.................................................................................... 27

4.3 UART configuration ......................................................................... 27

5 GUI and evaluation procedure ...................................................... 29

5.1 Status LEDs .................................................................................... 33

5.2 Test procedure for board calibration ............................................... 33

5.2.1 Presence detection calibration procedure ........................................ 34

5.2.2 QFOD calibration procedure ............................................................ 35

5.3 Efficiency ......................................................................................... 36

5.4 Stand-by consumption .................................................................... 37

6 Schematic diagram ........................................................................ 38

7 Bill of materials .............................................................................. 45

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8 Board assembly and layout .......................................................... 48

8.1 Power signals (BOOST, GND, LC) ................................................. 49

8.2 EMI components ............................................................................. 52

8.3 STWBC-EP layout ........................................................................... 53

8.4 Current sensing and demodulation ................................................. 54

9 References ..................................................................................... 55

10 Revision history ............................................................................ 56

List of tables

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List of tables

Table 1: STEVAL-ISB044V1 electrical performance: input characteristics ................................................ 9

Table 2: STEVAL-ISB044V1 electrical performance: system characteristics ............................................ 9

Table 3: Connector description ................................................................................................................. 10

Table 4: Test point description .................................................................................................................. 10

Table 5: STWBC-EP pin description ......................................................................................................... 12

Table 6: STEVAL-ISB044V1 bill of materials ........................................................................................... 45

Table 7: Document revision history .......................................................................................................... 56

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List of figures

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List of figures

Figure 1: STEVAL-ISB044V1 evaluation board .......................................................................................... 1

Figure 2: STWBC-EP block diagram .......................................................................................................... 8

Figure 3: STEVAL-ISB044V1 evaluation board: connectors, LEDs and test points .................................. 9

Figure 4: STEVAL-ISB044V1 evaluation board: power supply selection ................................................. 10

Figure 5: STWBC-EP pinout in MP-A10 configuration ............................................................................. 11

Figure 6: STSW-STWBCGUI installation file ............................................................................................ 13

Figure 7: Windows Device Manager: COM port selection ........................................................................ 13

Figure 8: STSW-STWBCGUI start screen ................................................................................................ 14

Figure 9: Dongle connection ..................................................................................................................... 15

Figure 10: Firmware download via STSW-STWBCGUI ........................................................................... 15

Figure 11: Firmware file selection message ............................................................................................. 16

Figure 12: Firmware file selection ............................................................................................................. 16

Figure 13: Power on message .................................................................................................................. 16

Figure 14: USB-to-UART dongle to STEVAL-ISB044V1 connection ....................................................... 17

Figure 15: DOS window: download in progress ....................................................................................... 17

Figure 16: STVP configuration .................................................................................................................. 18

Figure 17: STEVAL-ISB044V1 evaluation board: ST-LINK connection ................................................... 19

Figure 18: STVP core selection ................................................................................................................ 19

Figure 19: STVP download ....................................................................................................................... 20

Figure 20: STVP wrong device selected alert .......................................................................................... 20

Figure 21: STVP incompatibility device action query ............................................................................... 20

Figure 22: STSW-STWBCGUI command line .......................................................................................... 21

Figure 23: STSW-STWBCGUI command line with blank chip ................................................................. 21

Figure 24: STSW-STWBCGUI: convert CAB to STVP files ..................................................................... 22

Figure 25: Selecting the CAB file to be converted .................................................................................... 22

Figure 26: STVP project file name ............................................................................................................ 23

Figure 27: STVP files created ................................................................................................................... 23

Figure 28: STVP file selection .................................................................................................................. 24

Figure 29: STEVAL-ISB044V1 evaluation board: test setup configuration .............................................. 26

Figure 30: STEVAL-ISB044V1 evaluation board: external power supply connection .............................. 26

Figure 31: STEVAL-ISB044V1 evaluation board: external power supply connection .............................. 27

Figure 32: STEVAL-ISB044V1 evaluation board: UART connection ....................................................... 28

Figure 33: STSW-STWBCGUI: object detected and charge in progress ................................................. 29

Figure 34: STSW-STWBCGUI: Qi protocol window ................................................................................. 30

Figure 35: STSW-STWBCGUI: Qi monitor window .................................................................................. 30

Figure 36: STSW-STWBCGUI: Parameters window ................................................................................ 31

Figure 37: STSW-STWBCGUI: modified parameters ............................................................................... 31

Figure 38: STSW-STWBCGUI: saving modified parameters (Dump to bin) ............................................ 32

Figure 39: STSW-STWBCGUI: bin file backup ........................................................................................ 32

Figure 40: STSW-STWBCGUI: CAB file patch button .............................................................................. 33

Figure 41: STSW-STWBCGUI: start auto-calibration ............................................................................... 34

Figure 42: STSW-STWBCGUI: presence detection test .......................................................................... 34

Figure 43: STSW-STWBCGUI: test result ................................................................................................ 35

Figure 44: STSW-STWBCGUI: QFOD test .............................................................................................. 35

Figure 45: STSW-STWBCGUI: QFOD test result .................................................................................... 36

Figure 46: Efficiency setup ....................................................................................................................... 36

Figure 47: STEVAL-ISB044V1 evaluation board: efficiency performance with MP1B Rx ....................... 37

Figure 48: STEVAL-ISB044V1 circuit schematic (1 of 8) ......................................................................... 38

Figure 49: STEVAL-ISB044V1 circuit schematic (2 of 8) ......................................................................... 39

Figure 50: STEVAL-ISB044V1 circuit schematic (3 of 8) ......................................................................... 40

Figure 51: STEVAL-ISB044V1 circuit schematic (4 of 8) ......................................................................... 41

Figure 52: STEVAL-ISB044V1 circuit schematic (5 of 8) ......................................................................... 42

Figure 53: STEVAL-ISB044V1 circuit schematic (6 of 8) ......................................................................... 43

List of figures

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Figure 54: STEVAL-ISB044V1 circuit schematic (7 of 8) ......................................................................... 43

Figure 55: STEVAL-ISB044V1 circuit schematic (8 of 8) ......................................................................... 44

Figure 56: STEVAL-ISB044V1 evaluation board: functional block assembly .......................................... 48

Figure 57: STEVAL-ISB044V1 evaluation board: power signal routing ................................................... 49

Figure 58: STEVAL-ISB044V1 evaluation board: ground plan ................................................................ 49

Figure 59: STEVAL-ISB044V1 evaluation board: DC-DC boost routing details....................................... 50

Figure 60: STEVAL-ISB044V1 evaluation board: power GND routing details ......................................... 50

Figure 61: STEVAL-ISB044V1 evaluation board: bridge node routing details ......................................... 51

Figure 62: STEVAL-ISB044V1 evaluation board: shunt resistor routing details ...................................... 51

Figure 63: STEVAL-ISB044V1 evaluation board: EMI components (1 of 2) ............................................ 52

Figure 64: STEVAL-ISB044V1 evaluation board: EMI components (2 of 2) ............................................ 52

Figure 65: STWBC-EP digital controller layout ......................................................................................... 53

Figure 66: STEVAL-ISB044V1 evaluation board: current sensing ........................................................... 54

Figure 67: STEVAL-ISB044V1 evaluation board: current demodulation .................................................. 54

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Getting started

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1 Getting started

1.1 System requirements

To use the STEVAL-ISB044V1 evaluation board with the graphical user interface (GUI),
you need:

 a PC with Microsoft® Windows® operating system (XP or later versions)
 NET Framework 4
 a USB-to-UART cable to connect the board to the PC.

1.2 Package contents

 Hardware:

 a STEVAL-ISB044V1 evaluation board
 ST-LINK/V2 in-circuit debugger/programmer with single wire interface module

(SWIM), available for download on www.st.com

 a USB-to-UART interface dongle with a micro-USB cable for board debug and

GUI use

 Software:

 ST-LINK USB driver
 STVP programming software (integrated in ST_toolset available on www.st.com)
 FTDI VCP driver (http://www.ftdichip.com/Drivers/VCP.htm)
 PC GUI installation package

Hardware description and setup

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2 Hardware description and setup

2.1 System block diagram

Figure 2: STWBC-EP block diagram

2.2 STEVAL-ISB044V1 wireless transmitter board overview

The STEVAL-ISB044V1 evaluation board features:

 STWBC-EP digital controller
 15 W output power
 Qi MP-A10 reference design
 WPC Qi1.2.3 standard compliant
 Robust demodulation algorithm, with triple path (V, I, f)
 Foreign object detection (FOD)
 Accurate power control
 Active presence detection
 UART protocol to control and monitor the system
 Complete reference design (evaluation board, IC, firmware and tools)
 2-layer PCB for easy design
 Flash memory-based
 RoHS compliant

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Table 1: STEVAL-ISB044V1 electrical performance: input characteristics

Parameter

Input
characteristics

Min.

Typ.

Max.

Unit

Notes and conditions

Vin

Input voltage

5

12

13

V

Iin

Input current

1.6 2 A

Vin nominal, Iout = max. on MP1B
Rx

Input no-load current

mA

Input stand-by
current

1.4

mA

At typical voltage

Parameter

Input characteristics

Min.

Typ.

Max.

Unit

Notes and conditions

Fs

Switching frequency

110

180

kHz

Decrease with load

Duty cycle

Duty cycle modulation

5

50 % Duty cycle

ƞ

Full load efficiency

80 % Vin= 12 V, P Out Rx = 15 W

Table 2: STEVAL-ISB044V1 electrical performance: system characteristics

Figure 3: STEVAL-ISB044V1 evaluation board: connectors, LEDs and test points

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Connector reference

Description

J100

DC power jack connector

J101

Power/QC USB connector link

J500

SWIM connector used for the download

J501

UART jack connector used for the GUI

J700

Quick charge USB connector

Test point reference

Signal

Description

TP100

12 V

12 V power supply connection

TP101

GND

GND power connection

TP102

VIN

Input voltage

TP103

VDD_STWBC

4.5V LDO output voltage

TP200

VDCDC

Boost output voltage

TP301

ISENSE

Current measurement

TP302

GND

Power GND connection (Rsense)

TP303

VRSENSE

Rsense resistor voltage

TP304

Wireless charging coil connection

TP305

Wireless charging coil connection

Figure 4: STEVAL-ISB044V1 evaluation board: power supply selection

Table 3: Connector description

Table 4: Test point description

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Test point reference

Signal

Description

TP400

SYMBOL_DETECT

Symbol detector

TP501

I2C_SCL

STWBC I²C signal

TP502

I2C_SDA

STWBC I²C signal

TP503

USB_DP

STWBC UART Rx signal

TP504

USB_DM

STWBC UART Tx signal

TP506

GPIO_0

STWBC GPIO signal used for LEDs

TP507

GND

Ground

TP508

CURRENT_DEMOD

Symbol detector

TP509

QC_IO

Quick charge circuit signal

TP510

GND

Ground

TP511

GND

Ground

2.3 STWBC-EP pinout and pin description

The STWBC-EP is a multifunction device that can support several wireless
charging architectures.

This section shows the STWBC-EP pinout when the MP-A10 configuration is used.

Figure 5: STWBC-EP pinout in MP-A10 configuration

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Pin

number

Pin name

Pin

type

Firmware description

1

UART_RX

DI

Uart RX link on USB debug connector

2

PWM_QFOD

DO

PWM dedicated to QFOD circuit

3

I2C_SDA

I2C_SDA

4

I2C_SCL

I2C_SCL

5

DNBL

DO

Output driver for Low side branch

6

LED

DO

Digital output for light indicators

7

QC_IO

DO

Quick charge circuit signal

8

CMP_OUT_V

AI

Boost output voltage sensing

9

CS_CMP

AI

Boost current sensing

10

DCDC_DAC_REF

AI

DAC reference value for Boost output voltage

11

WAVE_SNS

AI

Symbol detector based on delta frequency

12

CURRENT_DEMOD

AI

Current demodulation

13

VDDA

PS

Analog power supply

14

VSSA

PS

Analog ground

15

TANK_VOLTAGE

AI

Analog input to measure the LC voltage (power calculation)

16

VTARGET

AI

Boost voltage measurement

17

QFOD_ADC

AI

High sensitivity peak voltage detector used for Quality Factor

measurement

18

COIL_TEMP

AI

Analog input for temperature measurement. The input is

connected to external NTC biased to VDD_STWBC

19

ISENSE

AI

Analog input to measure the current flowing into the power

bridge

20

VMAIN

AI

Analog input to measure the main power supply

21

DCDC_DRV

DO

DCDC boost PWM drive

22

DEMAGNET

DI

Boost demagnetization

23

SYMBOL_DETECT

DI

Voltage demodulation

24

DCDC_DAC

DO

Boost PWM output DAC (setting the CPP3 comparator voltage

reference)

25

UPBL

DO

Output driver for high side branch

26

DNBL_FB Used for hardware PWM programmation

27

SWIM

DIO

Digital IO for debug interface

28

NRST

DI

Reset

29

VDD

PS

Digital and I/O power supply

30

VSS

PS

Digital and I/O ground

31

VOUT

Supply

Internal LDO output

32

UART_TX

DO

Uart TX link on USB debug connector

AlI analog inputs are VDD compliant but can be used only between 0 and 1.2 V.

Table 5: STWBC-EP pin description

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3 Download procedure

1

Install the GUI by launching the STWBC_GUI_Setup.msi installation file

Figure 6: STSW-STWBCGUI installation file

2

Connect the wireless power transmitter board to the PC via the USB-to-UART
connection on J501 UART connector

3

Check Windows Device Manager to identify the correct port number and select the
appropriate USB serial COM port

Figure 7: Windows Device Manager: COM port selection

4

If the GUI is switched off, ensure that the COM port is not used on your computer.

To download the firmware to the board, the user has to install the GUI software which
allows a complete board monitoring via UART signals. Thus, to use the STSW­STWBCGUI, UART signals must be accessible.

In case of board issues, ST-LINK and STVP software can be installed to erase the
STWBC-EP Flash memory.

3.1 STSW-STWBCGUI software installation

Enter a specific COM port number (if not listed in the selection window) in the

Special text box (e.g.,“COM12” or the specific syntax “\\.\COM12”)

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Otherwise, try another USB port.

Figure 8: STSW-STWBCGUI start screen

5

Press “OK”.

The GUI is ready to run.

1

Connect the USB-to-UART dongle to the computer.

3.2 Firmware download via STSW-STWBCGUI

The following sections describe the firmware download through the UART connector via
STSW-STWBCGUI.

The download contains 3 files incorporated in a single cabfile.

3.2.1 Download procedure with a new chip (never been programmed)

If the chip has never been programmed, the download mode is enabled by default.

Do not connect the transmitter board for the moment.

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Figure 9: Dongle connection

2

Figure 10: Firmware download via STSW-STWBCGUI

From the GUI, select Load FW to board from the setup menu.

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3

As prompted, select the CAB file containing the firmware to download

Figure 11: Firmware file selection message

Figure 12: Firmware file selection

4

Supply the board with 12 V and keep it powered.

Figure 13: Power on message

5

When the DOS window appears, connect the transmitter board to the dongle using
a micro-USB cable.

Take care to connect it to the USB debug connector J501

on the opposite side of the power supply connection.

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Figure 14: USB-to-UART dongle to STEVAL-ISB044V1 connection

6

Figure 15: DOS window: download in progress

1

2

3

Follow the download progress in the DOS window and power the board off when
prompted.

3.2.2 Firmware upgrade procedure (chip already programmed)

If a chip has already been programmed with the firmware, the download mode is disabled
and special command needs to be sent to STWBC-EP to enable the download mode.

Supply the transmitter board via a power supply set to12 V.
Connect the USB-to-UART dongle to the transmitter board.
The STWBC-EP UART Rx/Tx signals are accessible on the transmitter board J501

connector, respectively on USB_DP and USB_DM (see Figure 14: "USB-to-UART

dongle to STEVAL-ISB044V1 connection").

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4

5
6

7

From the STSW-STWBCGUI, select Load FW to board in the setup menu (see

Figure 10: "Firmware download via STSW-STWBCGUI").

As prompted, select the CAB file containing the firmware to download (see

Figure 11: "Firmware file selection message").

As prompted, power the board on and keep it powered.
Follow the download progress in the DOS window and power the board off when

prompted (see Figure 15: "DOS window: download in progress").
In case of problems in downloading the firmware through UART (for example,

firmware corruption during update), refer to the following section.

3.3 Erasing firmware procedure using STVP

3.3.1 Requirements

To start the firmware erasing procedure using STVP, you have to install on your PC:

 ST-LINK USB driver
 STVP programming tool (available at www.st.com)
 ST-LINK hardware tools

You also need to configure STVP as shown below.

Figure 16: STVP configuration

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3.3.2 Procedure

1

Power the target off.

2

Power the target on.

3

Connect ST-LINK circuit to the PC via USB.

4

Connect the ST-LINK–SWIM cable to the target.

Figure 17: STEVAL-ISB044V1 evaluation board: ST-LINK connection

5

Launch STVP software.

6

Select STM8AF6166 as core.

Figure 18: STVP core selection

Pay special attention in connecting the SWIM cable to the transmitter
board correctly, as shown below.

Do not upload any program into the STVP RAM area, as all bits will be
erased (load 00 00 00).

Download procedure

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7

Transfer the ”00 00” to the STWBC-EP via the SWIM interface using the appropriate
push button.

Figure 19: STVP download

8

Click OK if a “wrong device selected” alert appears.

Figure 20: STVP wrong device selected alert

9

Click YES if “An incompatibility has been found with this device” alert appears.

Figure 21: STVP incompatibility device action query

After this operation, the programming procedure starts. At completion, the STVP informs the
user that the program is loaded and verified.

< PROGRAM MEMORY programming completed.
> Verifying PROGRAM MEMORY area...
< PROGRAM MEMORY successfully verified.

10

Exit from the STVP program.

Disconnect SWIM.

Remove power supply from the STEVAL-ISB044V1 transmitter board.

Retry the UART download procedure if necessary.

1

Ensure a dedicated directory has the following files:

 STWBC_Loader.exe
 stwbc_loader_not_empty.bat
 enable_boot.bin

 “firmware version“.cab

11

12

13

3.4 Firmware download with command line

3.4.1 Firmware download with written chip

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2

Starting from the STSW-STWBCGUI folder, run the stwbc_loader_not_empty.bat from
the command line, specifying the COM number (e.g. COM2) and firmware filename

parameters (“firmware name.cab”).

Figure 22: STSW-STWBCGUI command line

3.4.2 Firmware download with blank chip

filename.

Figure 23: STSW-STWBCGUI command line with blank chip

1

If the STWBC-EP memory is erased, the procedure sequence is a bit different.
1

Connect the UART cable to the board.

2

Select Load FW to board from the STSW-STWBCGUI and power the board.

3

Execute the command line as per the example below with the appropriate firmware

If the COM port is > COM8, the user has to use the syntax \\.\COMx
where COMx is the COM port number.

A dedicated tool is available for simultaneous downloads (refer to the
STSW-STWBCFWDT firmware downloader tool).

3.5 STVP file creation

To use the STVP to download, you must generate new files from the *.cab. The existing
GUI gives you this possibility.

Select the convert CAB to STVP files command from the STSW-STWBCGUI
setup menu

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Figure 24: STSW-STWBCGUI: convert CAB to STVP files

2

Follow the prompt to select the appropriate cabfile.

Figure 25: Selecting the CAB file to be converted

3

Follow the prompt to provide the project file name.

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Figure 26: STVP project file name

Four files will be generated as shown below.

Figure 27: STVP files created

1

Power the target off.

2

Power the target on.

3

Connect ST-LINK circuit to the PC via USB.

4

Connect the ST-LINK–SWIM cable to the target.

5

Launch STVP software.

3.6 Firmware download with STVP

Pay special attention in connecting the SWIM cable to the transmitter
board correctly, as shown in Figure 17: "STEVAL-ISB044V1 evaluation

board: ST-LINK connection".

Download procedure

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6

7

8

Select STM8AF6166 as core (see Figure 18: "STVP core selection").

Figure 28: STVP file selection

9

Wait few seconds.
The following message should appear:

Loading file program.hex in PROGRAM MEMORY area...
< File successfully loaded. File Checksum 0x1D1205

It is normal that some warnings 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!

10

11

12

In STVP, open the Project menu and click Open.
Select the .stp given in the zip file.

In STVP, open the Program menu and select All tabs (on active sectors, if any)

Click OK if a “wrong device selected” alert appears (see Figure 20: "STVP wrong

device selected alert").

Click YES if “An incompatibility has been found with this device” alert appears (see

Figure 21: "STVP incompatibility device action query").

After this operation, the programming procedure starts. At completion, the STVP
informs the user that the program is loaded and verified.

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< PROGRAM MEMORY programming completed.
> Verifying PROGRAM MEMORY area...
< PROGRAM MEMORY successfully verified.

13

Exit from the STVP program.

14

Disconnect SWIM.

15

Remove power supply from the STEVAL-ISB044V1 transmitter board.
The IAR toolchain can be installed also for firmware compilation and download.

Evaluation equipment setup

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4 Evaluation equipment setup

Figure 29: STEVAL-ISB044V1 evaluation board: test setup configuration

The board is powered via an external power supply or a USB charger. An electronic load is
connected to the receiver output to load up to 15 W.

On the basis of measurements, voltmeters and ammeters measure input/output voltage
and current.

4.1

External power supply

The power supply is set to 12 V/2 A for EPP mode and 5 V/2 A for BPP mode.
The board is connected to the external power supply through wires.
The jumper has to be set to select the jack/external power supply input.

Figure 30: STEVAL-ISB044V1 evaluation board: external power supply connection

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Evaluation equipment setup

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4.2 USB charger

This UART connection is mandatory for parameter settings and debug of the
board which is using the STSW-STWBCGUI.

The board can be supplied by a USB charger. The jumper J101 should be set to select the
USB supply input.
CIA simple 5 V USB charger can be used. Considering the peak currents and the system
efficiency, a 5 V/2 A USB charger must be considered. At this input voltage, BPP mode
only is available.
It is also possible to use a Quick Charge (QC) wall charger in order to provide higher
voltage. By default, D+/D- interface selects 12V on V
mode.
To provide 15 W on the receiver side and considering the system efficiency, a 24 W Quick
Charge wall charger should be used.
The 24 W QC wall charger, with Quick Charge 3.0, tested with our solution is
manufactured by KOVOL.
The USB cable between the charger and the board should be of good quality. To minimize
the losses, a 20 AWG USB cable must be used.

Figure 31: STEVAL-ISB044V1 evaluation board: power supply connection

. This enables to support EPP

BUS

4.3 UART configuration

The STSW-STWBCGUI is installed on the PC connected to the board via the USB-to­UART cable (connected on the board J501 USB debug connector).

Evaluation equipment setup

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Figure 32: STEVAL-ISB044V1 evaluation board: UART connection

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5 GUI and evaluation procedure

The STSW-STWBCGUI thoroughly monitors STWBC-EP operations.
The main screen provides transmitter and Qi receiver status information.

Figure 33: STSW-STWBCGUI: object detected and charge in progress

The STSW-STWBCGUI can also display the Rx to Tx communication protocol errors,
useful for system debugging.

GUI and evaluation procedure

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DocID031141 Rev 1

Figure 34: STSW-STWBCGUI: Qi protocol window

You can also monitor STWBC-EP internal variables such as bridge voltage and frequency,
Rx reported power, coil temperature, etc.

Figure 35: STSW-STWBCGUI: Qi monitor window

The GUI user-friendly interface allows efficient system adjustment (thresholds, regulation
error) and lets you store parameters to and load parameters from your computer.

The parameters have the following levels of protection:
 Level 0: parameters can be modified without protection

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 Level 1: more critical parameters to be modified with caution. You must click the

Unlock param button before modifying it, with caution, as it can lead to system
malfunction or trigger unexpected behavior incompatible with Qi standard.

Figure 36: STSW-STWBCGUI: Parameters window

Parameters can be modified and their effect can be tested immediately by clicking Push to
target; modified parameters lose their highlighted background.

Figure 37: STSW-STWBCGUI: modified parameters

The GUI embeds the STSW-STWBCFWDT downloader interface (which uses UART
connection) and includes tools to generate binary files with adjusted parameters and to
build new firmware packages incorporating these files.

GUI and evaluation procedure

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Through the GUI, you can change the parameters and produce a new cab to program a
batch of new boards. To this aim, dump the parameters into a bin file, but only after clicking
the Push to target button.

Figure 38: STSW-STWBCGUI: saving modified parameters (Dump to bin)

Figure 39: STSW-STWBCGUI: bin file backup

You can then select Modify parameters in CAB file from the setup menu and select the
appropriate firmware CAB file to be patched. This operation will alter the firmware file with
new tuning parameters, which can be subsequently loaded using the standard procedure.

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GUI and evaluation procedure

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5.1 Status LEDs

Both calibrations are mandatory to ensure a good functioning of the transmitter
board.

Figure 40: STSW-STWBCGUI: CAB file patch button

The status LEDs give the state of the charge:
At startup

 Red short blinking: when the board auto-calibration is on-going. The user has to wait

for the LED to be switched off 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 match the firmware

In 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, some types of end power transfer or no response
error code)

5.2 Test procedure for board calibration

There are 2 auto-calibration phases in the GUI: one for the presence detection and one for
the QFOD.

GUI and evaluation procedure

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Figure 41: STSW-STWBCGUI: start auto-calibration

This calibration should be done only once after each new firmware download, with
NO Receiver placed on the transmitter.

1

2

Figure 42: STSW-STWBCGUI: presence detection test

You must first calibrate the presence detection and then the QFOD.

5.2.1 Presence detection calibration procedure

Set the test number to 1
Click the Start button

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At the end of the test, in the protocol window, the AUTOCAL_TEST_DONE is set and in

3

Start the test again if the returned status is different.

1

2

Figure 44: STSW-STWBCGUI: QFOD test

the test window the status is Test Done.

Figure 43: STSW-STWBCGUI: test result

5.2.2 QFOD calibration procedure

Set the test number to 2
Click the Start button

At the end of the test, in the protocol window, the AUTOCAL_TEST_DONE is set
and in the test window the status is Test Done.

GUI and evaluation procedure

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DocID031141 Rev 1

Figure 45: STSW-STWBCGUI: QFOD test result

3

Start the test again if the returned status is different.

5.3 Efficiency

Efficiency measurements are performed on a Qi certification tester.
The STEVAL-ISB044V1 transmitter is supplied by 12 V/2 A and the receiver voltage level is

12 V (MP1B).
P

is the output power actually measured at the receiver output (not only at the rectifier

OUT

output) and PIN is the input power.
Efficiency is measured with a setup configuration as per the picture below.

Figure 46: Efficiency setup

The figure below shows the typical performance on different coils (efficiency=P

OUT/PIN

).

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0.0%

10.0%

20.0%

30.0%

40.0%

50.0%

60.0%

70.0%

80.0%

90.0%

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

Efficiency

Rx output Power (W)

V4.0

Figure 47: STEVAL-ISB044V1 evaluation board: efficiency performance with MP1B Rx

The maximum efficiency is 82.2% at 7 W.

5.4 Stand-by consumption

In stand-by, when the board is supplied at 12 V, very low power consumption is achieved.
In this mode, device detection is still ensured; power consumption is reduced down to 1.4

mA average.
The STEVAL-ISB044V1 evaluation board has a low stand-by power of only 17 mW.
To measure this low power consumption, the UART cable must be unplugged.

Schematic diagram

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DocID031141 Rev 1

12 V DC

4.5 V

NOT POPULATED

VDD_STWBC

VIN

VBUS

USB_VCC_QC

C107

100NF

TP102

5001

1

C115

100NF

TP100

WIRE_SOLDER

1

C108

10NF

J100

PJ-002A

231

C117

1 µF

NP

J101

1 3

2

R1090RNP

D100

SMM4F13A

C100

NP

C116

NP

C102

NP

C109

NP

C104

10NF

C103

10 µF

U100

VIN1GND2ON/OFF

3

ADJ

4

VOUT

5

R100

220K

R106

120K

L102

10 µH

NP

R107

1M

NP

U101

NP

VIN7TON3EN4LNM

10

EP

11

GND

5

FB

2

VCC

8LX6

VBIAS

9

PGOOD

1

C106

22 µF

R101

18K

TP103

1

C110

100NF

C101

10 µF

TP101

WIRE_SOLDER

1

L101

2.2 µH

C114

NP

C113

100NF

C111

10 µF

C112

100NF

R108

NP

R104

330K

LDK320M-R

L6984

6 Schematic diagram

Figure 48: STEVAL-ISB044V1 circuit schematic (1 of 8)

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Schematic diagram

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VIN

VDCDC

DCDC_DAC

CMP_OUT_V

CS_CMP

DCDC_DRV

VTARGET

DCDC_DAC_REF

DEMAGNET

C217

22 µF

R206

47R

R200

10R

C206

5.6NF

C216

470pF

Q203

N-MOS

STL10N3LLH5

5

4

1

6

7

8

2

3

C209 1NF

R209

220K

R215

100K

TP200

1

C211

NP

C207

R214

0R

C213

10PF

R211

10K

Q202

NPN-PNP

MMDT4413

2

3

1

4

5

6

C214

220NF

+

C205

D202

4.3V

C208

D201

STPS8L30DEE

C203

C200

NP

R205

0.068R

R208

75K

R213

4.7K

C204

C212

10NF

R207

3.3K

L200

4.7 µH

R201

NP

R210

10K

C202

100NF

R202

1K

R204

470R

C215

220NF

R212

3.3K

10 µF

10 µF

100 µF

22 µF

22 µF

Figure 49: STEVAL-ISB044V1 circuit schematic (2 of 8)

Schematic diagram

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DocID031141 Rev 1

Direct GND line connection

VDD_STWBC

VDD_STWBC

VDCDC

VDCDC

POWER_NODE

UPBL

DNBL

ISENSE

IDEMOD

PWM_QFOD

C307

22NF

C300 47NF

R304

470K

R309

1K

TP304

WIRE_SOLDER

1

C303

1NF

R306

470K

R305

470K

C310

1.5NF

C301 47NF

U300

MCP14700

GND

4

PWMHI

2

LOWDRV

5

PWMLO

3

VCC

6

PHASE

1

HIGHDRV

8

BOOT

7

TH

9

C306

100NF

R300 4.7R

TP302

1

C304 47NF

D300

4148WS

C309

470NF

R301 4.7R

Q304

N-MOS

STL10N3LLH5

5

4

1

6

7

8

2

3

R303

100K

Q303

N-MOS

STL10N3LLH5

5

4

1

6

7

8

2

3

TP303

1

TP305

WIRE_SOLDER

1

Q302

NPN

1

2 3

Q301

NPN-NPN

2

3

1

4

5

6

M300

C302 47NF

C305

10 µF

R308

10K

R307

0.022R

TP301

1

R302

1M

C308

470PF

BRIDGE_NODE

HVG

LVG

VRSENSE

12 µH

Figure 50: STEVAL-ISB044V1 circuit schematic (3 of 8)

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Schematic diagram

DocID031141 Rev 1

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VDD_STWBC

SYMBOL_DETECT

POWER_NODE

R401

82K

R407

47K

R411
82K

Q400
NPN-NPN

231

4

5

6

R400

470R

D400

3

1

2

C406

4.7NF

C401
22NF

R408
1M

R410

2.2K

R402

150K

R409

100K

C404

4.7NF

C402
100PF

R406

100K

C405
220NF

R405

22K

C400

10NF

R404
470K

TP400

1

C403
22PF

R403
470K

Figure 51: STEVAL-ISB044V1 circuit schematic (4 of 8)

Schematic diagram

UM2301

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DocID031141 Rev 1

STWBC-EP

Digital controller

Layout note : GND reference of the Op

Amp inputs have to be connected in

star ground connection with the GND

plan of the power bridge.

USB f or UART Debug FOR DEBUG

VDD_STWBC

VDD_STWBC

VDD_STWBC

VDD_STWBC

VDD_STWBC

VDD_STWBC

VDD_STWBC

VDD_STWBC

VDD_STWBC

VBUS

DNBL

ISENSE

UPBL

CMP_OUT_V

CS_CMP

DEMAGNET

DCDC_DAC

DCDC_DRV

VTARGET

QFOD_ADC

DCDC_DAC_REF

IDEMOD

SYMBOL_DETECT

POWER_NODE

POWER_NODE

QC_IO

QFOD_ADC

DNBL

PWM_QFOD

POWER_NODE

R522

47K

D500

BAS521-7

TP510

1

TP509

1

C501

100NF

R513

100K

R526

1K

C514

2.2NF

C511

220PF

D504

BAV99W

3

1

2

TP504

1

R528

100K

R521

1M

D507

RED

R519

22K

R512

220R

TP501

1

R530

33K

D501

BAV99W

3

1

2

R510

180K

C513

22PF

D506

GREEN

TP508

1

L502

1K

C506

1NF

R527

100K

J501

629105150521

USB_VCC

1

USBDM

2

USBDP

3

USB_GND

5

SHELL6SHELL7SHELL

8

ID

4

SHELL

9

R502

10K

R507

2.7K

J500

123

4

C503

1UF

TP511

1

C507

10NF

C512

100NF

D508

BAS521-7

R529 33K

NTC

R516

47K

R511

100K

R506

100K

TP503

1

+

-

U501

TSV521ICT

1

+IN

3 -IN

2

V-

5V+4

OUT

C500

100NF

R505

10K

TP506

1

TP507

1

R514

220R

R518

100K

C502

100NF

C504

1NFTP502

1

D509

RB520S

L501

1K

R515

100R

R503 100K

C510

100NF

C509

100NF

Q500

NPN-PNP

2

3

1

4

5

6

C505

22NF

R504

10K

U500

STWBC_EP

VDD

29

VDDA

13

VOUT

31

VSS

30

VSSA

14

DCDC_DRV21DCDC_DAC24UPBL25DNBL5PWM_QFOD2UART_TX32UART_RX1LED6QC_IO

7

NRST28SWIM

27

TANK_VOLTAGE

15

VTARGET

16

QFOD_ADC

17

COIL_TEMP

18

ISENSE

19

VMAIN

20

CMP_OUT_V

8

CS_CMP

9

DCDC_DAC_REF

10

WAVE_SNS

11

CURRENT_DEMOD

12

DEMAGNET

22

SYMBOL_DETECT

23

DNBL_FB

26

I2C_SDA

3

I2C_SCL

4

VSS

33

R525 1K

R520

330R

C508

2.2 µF

R517

1M

VDD_STWBC

RESET

SWIM

SWIM

TANK_VOLTAGE

CURRENT_DEMOD

I2C_SCL

I2C_SDA

RESET

CURRENT_DEMOD

USB_DM

TANK_VOLTAGE

WAVE_SNS

USB_DP

USB_DM

USB_DP

WAVE_SNS

Figure 52: STEVAL-ISB044V1 circuit schematic (5 of 8)

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Schematic diagram

DocID031141 Rev 1

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M608

HTSB-M3-15-5-1

M621

HOLE_3.2MM_6

M624

HOLE_3.2MM_6

M623

HOLE_3.2MM_6

M619

WExxx_2xx

M604

D01475

M609

HTSB-M3-15-5-1

M600

M320 KRSTMCZ100-

M622

HOLE_3.2MM_6

M601

M320 KRSTMCZ100-

M602

M320 KRSTMCZ100-

M611

HTSB-M3-15-5-1

M607

D01475

M620

SPACER_3MM_MP_A6-A2

M627

OPTICAL_TARGET

M606

D01475

M610

HTSB-M3-15-5-1

M626

OPTICAL_TARGET

M603

M320 KRSTMCZ100-

M605

D01475

M625

OPTICAL_TARGET

USB for Quick Charge
3 A on pin 1 & pin 5
1 A on other pins

VDD_STWBC

VDD_STWBC

QC_IO

USB_VCC_QC

R701
10R

R706

10R

R705
NP

R700
100K

R704
100K

Q700

NPN-NPN

2

3

1

4

5

6

J700

USB_VCC

1

USBDM

2

USBDP

3

USB_GND

5

SHELL

6

SHELL

7

SHELL

8

ID

4

SHELL

9

R702
39K

R707
39K

R703
33K

USB_DM_QC
USB_DP_QC

Figure 53: STEVAL-ISB044V1 circuit schematic (6 of 8)

Figure 54: STEVAL-ISB044V1 circuit schematic (7 of 8)

Schematic diagram

UM2301

44/57

DocID031141 Rev 1

USB

5V

3V3

IO Voltage selection

(3V3 / 5V)

For debug

VBUS_USB_MASTER

VSS

VSS

VSS

VSS

VSS

VSS

VSS

VCC_IO

VCC_IO

VCC_IO

VSS

VSS

VSS

VSS

VSS

VBUS_USB_MASTER

VBUS

VBUS

VSS

R807

NP

R802

0R

C802

10NF

U801

FT232R

TXD

1

DTR#

2

RTS#

3

VCCIO

4

RXD

5

RI#

6

GND1

7

NC1

8

DSR#

9

DCD#

10

CTS#

11

CBUS412CBUS213CBUS3

14

OSCO28OSCI27TEST26AGND25NC224CBUS023CBUS122GND221VCC5I20RESET#19GND183V3OUT17USBDM16USBDP

15

C807

100NF

R803

330R

R805

0R

R810

10K

C803

100NF

C801

100NF

R801

NP

J801

USB_VCC1USBDM2USBDP3USB_GND

4

SHELL1

5

SHELL2

6

L800

120R

R804

0R

D800

I/O1#1

1

GND

2

VBUS5I/O2#44I/O1#6

6

I/O2#3

3

C805

47PF

R808 0R

J800

VBUS

1

USBDM

2

USBDP

3

GND

4

SHELL15SHELL48SHELL26SHELL3

7

C806

10UF

C804

47PF

R809

10K

R806

330R

TXD

VCC3O

RXD

USBDM_DONGLE

USBDP_DONGLE

VBUS External

Power Supply

Connector

USBLC6-2SC6

Figure 55: STEVAL-ISB044V1 circuit schematic (8 of 8)

UM2301

Bill of materials

DocID031141 Rev 1

45/57

7 Bill of materials

Ref.

Part/Value

Order code

1

2

C100,
C114

NP, 0603

Ceramic
capacitors

Any

C_NP_0603

2

2

C101,
C103

10 µF, 25 V,
1206, ±20%

Ceramic
capacitors

Wurth
Elektronik

885012108021

3 1 C102

NP, 1210

Ceramic
capacitor

Any

C_NP_1210

4

4

C104,
C108,
C212,
C507

10 NF, 50 V,
0402, ±15%

Ceramic
capacitors

Any

10NF_50V_X7R_0402

5

4

C106,
C204,
C208,
C217

22 µF, 25 V,
1210, ±20%

Ceramic
capacitors

Wurth
Elektronik

885012109014

6

8

C107,
C110,
C115,
C306,
C500,
C501,
C502,
C509

100 NF, 25
V,0402, ±15%

Ceramic
capacitors

Any

100NF_25V_X5R_0402
7

4

C109,
C116,
C200,
C211

NP, 0402

Ceramic
capacitors

Any

C_NP_0402
8 1 C111

10 µF, 10 V,
0805, ±10%

Ceramic
capacitor

Murata

GRM21BR71A106KE51L

9

4

C112,
C113,
C510,
C512

100 NF, 50 V,
0402, ±15%

Ceramic
capacitors

Any

100NF_50V_X5R_0402
10 1 C117

NP, 0603

Ceramic
capacitor

Murata

GRM188R61E105KA12J

11 1 C202

100 NF, 50 V,
0603, ±5%

Ceramic
capacitor

Murata

GRM188R71H104KA93D

12

2

C203,
C207

10 µF, 50 V,
1206, ±10%

Ceramic
capacitors

Any

10UF_50V_X5R_1206

13 1 C205

100 µF, 35 V,
±20%

Aluminium
capacitor

Panasonic

EEEFT1V101AP

14 1 C206

5.6 NF, 50 V,
0402, ±15%

Ceramic
capacitor

Any

5.6NF_50V_X7R_0402

15 1 C209

1 NF, 50 V,
0402, ±15%

Ceramic
capacitor

Any

1NF_50V_X5R_0402

Table 6: STEVAL-ISB044V1 bill of materials

Q.

Item

ty

Description

Manufacturer

Bill of materials

UM2301

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DocID031141 Rev 1

Ref.

Part/Value

Order code

16 1 C213

10 PF, 50 V,
0402, ±15%

Ceramic
capacitor

Any

10PF_50V_X7R_0402

17

2

C214,C21
5

220 NF, 35 V,
0603, ±15%

Ceramic
capacitors

Any

220NF_35V_X7R_0603

18 1 C216

470pF,
50V,15%

Ceramic
capacitor

Any

470pF_50V_COG_402

19

4

C300,
C301,
C302,
C304

47 NF, 100 V,
1206, ±5%

Ceramic
capacitors

TDK

C3216C0G2A473J115AC
20 1 C303

1 NF, 50 V,
0603, ±15%

Ceramic
capacitor

Any

1NF_50V_X5R_0603

21 1 C305

10 µF, 6.3 V,
0805, ±15%

Ceramic
capacitor

Any

10UF_6V3_X5R_0805

22

2

C307,
C505

22 NF, 50 V,
0402, ±15%

Ceramic
capacitors

Any

22NF_50V_X7R_0402

23 1 C308

470 PF, 50 V,
0402, ±15%

Ceramic
capacitor

Any

470PF_50V_X7R_0402

24 1 C309

470 NF, 25 V,
1206, ±15%

Ceramic
capacitor

Any

470NF_25V_X7R_1206

25 1 C310

1.5 NF, 50 V,
0402, ±10%

Ceramic
capacitor

Any

1.5NF_50V_X7R_0402

26 1 C400

10 NF, 100 V,
0805, ±5%

Ceramic
capacitor

TDK

C2012C0G2A103J125AA

27 1 C401

22 NF, 100 V,
1210, ±5%

Ceramic
capacitor

TDK

C3225C0G2A223J160AA

28 1 C402

100 PF, 50 V,
0402, ±5%

Ceramic
capacitor

Any

100PF_50V_COG_0402

29

2

C403,
C513

22 PF, 50 V,
0402, ±5%

Cer,402

Any

22PF_50V_COG_0402

30 1 C404

4.7 NF, 50 V,
0402, ±15%

Ceramic
capacitor

Any

4.7NF_50V_X7R_0402

31 1 C405

220NF,
50V,10%

Ceramic
capacitor

Any

220NF_50V_X7R_0402

32 1 C406

4.7 NF, 100 V,
0603, ±10%

Ceramic
capacitor

TDK

CGA3E2X7R2A472K080
AA

33 1 C503

1 µF, 16 V,
±10%

Ceramic
capacitor

Any

1UF_16V_X5R_0402

34

2

C504,
C506

1 NF, 100 V,
0402, ±15%

Ceramic
capacitors

Any

1NF_100V_X7R_0402

35 1 C508

2.2 µF, 25 V,
0402, ±10%

Ceramic
capacitor

Any

2.2UF_25V_X5R_0402

36 1 C511

220 PF, 50 V,
0402, ±15%

Ceramic
capacitor

Any

220PF_50V_X7R_0402

Item

Q.
ty

Description

Manufacturer

UM2301

Bill of materials

DocID031141 Rev 1

47/57

Ref.

Part/Value

Order code

37 1 C514

2.2 NF, 50 V,
0402, ±15%

Ceramic
capacitor

Any

2.2NF_50V_X7R_0402

38

3

C801,
C803,
C807

100 NF, 50 V,
0603, ±15%

Ceramic
capacitors

Any

100NF_50V_X7R_0603

39 1 C802

10 NF, 50 V,
0603, ±15%

Ceramic
capacitor

Any

10NF_50V_X7R_0603

40

2

C804,
C805

47 PF, 25 V,
0603, ±15%

Ceramic
capacitors

Any

47PF_25V_X5R_0603

41 1 C806

10 µF, 25 V,
0805, ±10%

Ceramic
capacitor

Any

10UF_25V_X7R_0805

42 1 D100

SMM4F13A

TVS

ST

SMM4F13A-TR

43 1 D201

Power
Schottky
rectifier

ST

STPS8L30DEE-TR

Item

Q.
ty

STPS8L30DEE

Description

Manufactur

er

Board assembly and layout

UM2301

48/57

DocID031141 Rev 1

Power Supply
connections &
input filtering

v

Boost
Circuit

LDO (DCDC
optional)

Quick Charge
circuit

Demodulation
circuits

STWBC-EP

Half bridge driver
and LC Tank circuit

Voltage/current
demodulation circuits

LED, SWIM and
USB/UART debug
connectors

8 Board assembly and layout

The STEVAL-ISB044V1 evaluation board is designed using a low cost 2-layers PCB with
all the components on the top side.

The test points allow the user to evaluate the STWBC-EP solution with probes.
In addition, UART is accessible through a micro-USB connector and the SWIM is routed to

a header connector.

Figure 56: STEVAL-ISB044V1 evaluation board: functional block assembly

UM2301

Board assembly and layout

DocID031141 Rev 1

49/57

Layer 1: large GND tracks with lot
of vias for high power circuits

Layer 1: Large tracks for high
current circuits (booster, half
bridge, LC tank)

Full GND plan
on Layer 2

Only a few noisy signals
routed partially on this layer
(PWM)

8.1 Power signals (BOOST, GND, LC)

Figure 57: STEVAL-ISB044V1 evaluation board: power signal routing

Figure 58: STEVAL-ISB044V1 evaluation board: ground plan

DC-DC boost signals are designed on the same layer: tracks must be wide (>2 mm) to
handle high current.

Board assembly and layout

UM2301

50/57

DocID031141 Rev 1

VIN

VDCDC

DEMAGNET

C217

22 µF

R200
10R

C206

5.6NF

C216

470pF

Q203
N-MOS
STL10N3LLH5

5

4

1

678

2

3

C209 1NF

R215
100K

TP200

1

C207

R214

0R

+

C205

D202

4.3V

C208

D201

STPS8L30DEE

C203

C200
NP

R205

0.068R

C204

L200

4.7 µH

C202
100NF

R202
1K

R204
470R

10 µF

10 µF

100 µF

22 µF

22 µF

Net VIN

Net L200 D201-QQ203

Net D201-C205

Net Q203
R205

VIN

C217

22 µF

R200

Q203N-MOS

STL10N3LLH5

5

4

1

678

2

3

1
4

R205

0.068R

R204
470R

GND from R205 and
C217: high current
A lot of vias

ONLY in this area

12 V DC

USB_VCC_QC

TP100

WIRE_SOLDER

1

J100

PJ-002A

2

3

1

J101

1 3

2

D100

SMM4F13A

C100
NP

C102
NP

C101

10 µF

TP101

WIRE_SOLDER

1

C114
NP

C112
100NF

GND directly connected to
TP101 and Capa
connect bottom side with a
lot of vias

10 R

GND VBOOST and
GND Capa of tank
on the same area
Insert many vias
for high current

ONLY in this area

GND from R307:
connected near GND
from " GND VBOOST"

Direct GND line connection

TP302

1

TP303

1

R307

0.022R

VRSENSE

P

O

W

E

R

_

N

O

D

E

C

3

0

0

4

7

N

F

C

3

0

1

4

7

N

F

C

3

0

4

4

7

N

F

C

3

0

2

4

7

N

F

VDCDC

C206

5.6NF

TP200

1

C207

+

C205

C208C203

C204

C202
100NF

10 µF

10 µF

100 µF

22 µF

22 µF

Figure 59: STEVAL-ISB044V1 evaluation board: DC-DC boost routing details

Figure 60: STEVAL-ISB044V1 evaluation board: power GND routing details

Bridge nets are designed on the top layer; traces must be very large (>2 mm).

UM2301

Board assembly and layout

DocID031141 Rev 1

51/57

VDCDC

VDCDC

POWER_NODE

PWM_QFOD

C300 47NFR309

1K

TP304

WIRE_SOLDER

1

C303
1NF

C310

1.5NF

C301 47NF

C304 47NF

D300
4148WS

Q304
N-MOS
STL10N3LLH5

5167

8

2

3

Q303
N-MOS
STL10N3LLH5

5167

8

2

3

TP305

WIRE_SOLDER

1

Q302
NPN

1

2 3

M300

C302 47NF

BRIDGE_NODE

12 µH

Net VDCDC-Q303

Net bridge node

Net power node

Net GND

Direct GND line connection

C303
1NF

TP302

1

Q304
N-MOS
STL10N3LLH5

5

4

1

678

2

3

123

TP303

1

R307

0.022R

VRSENSE

VRSENSE trace
between Q304 and R307
must be very short

GND -R307 connected
directed to GND - VBOOST

Figure 61: STEVAL-ISB044V1 evaluation board: bridge node routing details

Figure 62: STEVAL-ISB044V1 evaluation board: shunt resistor routing details

Board assembly and layout

UM2301

52/57

DocID031141 Rev 1

C206

C202

R214 - C216

VDCDC

C206

5.6NF

C216

470pF

TP200

1

C207

R214

0R

+

C205

C208

D201

STPS8L30DEE

C203

C204

C202
100NF

R202
1K

10 µF

10 µF

100 µF

22 µF

22 µF

R214 and C216
very close to D201

C202 and C206
near C205 VDCDC
and C205 GND

12 V DC

USB_VCC_QC

TP100

WIRE_SOLDER

1

J100

PJ-002A

2

3

1

J101

1 3

2

D100

SMM4F13A

C100
NP

C102NPC103

10 µF

C101

10 µF

TP101

WIRE_SOLDER

1

L101

2.2 µH

C114
NP

C112
100NF

8.2 EMI components

Figure 63: STEVAL-ISB044V1 evaluation board: EMI components (1 of 2)

Ceramic capacitors (C100, C101, C103, C112, C114 and C100) for EMI and filters must be
placed close to the supply input and L101.

Figure 64: STEVAL-ISB044V1 evaluation board: EMI components (2 of 2)

UM2301

Board assembly and layout

DocID031141 Rev 1

53/57

C112

C100

C103

C501

L501

C503

L502

C502

R505

C501

100NF

L501
1K

VDD

29

VDDA

13

DEMAGNET

22

SYMBOL_DETECT

23

C501-L501 near
VDDA (pin13)

C503-C502-L502
near VDD (pin29)

R505 near Reset
(pin 28)

STWBC-EP
Digital controller

DCDC_DAC

DCDC_DRV

L502
1K

C503

1UF

R505
10K

C502
100NF

VDD

29

VOUT

31

DCDC_DRV

21

DCDC_DAC

24

NRST

28

SWIM

27

SWIM

RESET

8.3 STWBC-EP layout

Figure 65: STWBC-EP digital controller layout

Board assembly and layout

UM2301

54/57

DocID031141 Rev 1

Q301

R308

C307

Direct GND line connection

VDD_STWBC

ISENSE

IDEMOD

C307

22NF

R304
470K

R306
470K

R305
470K

R303
100K

Q301
NPN-NPN

231

4

5

6

R308
10K

R307

0.022R

TP301

1

R302
1M

C308
470PF

VRSENSE

C307 near
Isense input (pin 19)

Current amplifier
(Q301, R and C)
near VRSENSE

Warning:
R308 GND is done through
a trace connected to GND
on Rsense R307

Don't mix this track with
ground plane

C112

C100

C501

L501

C502

L502

C503

R505

Q301

R308

U501

R517

C513

C512 C511

Q301

C112

C100

C502

L502

C503

R505

Q301

R308

U501

R517

C513

C512 C511

Q301

C510

R519 R518

VDD_STWBC

VDD_STWBC

IDEMOD

C511

220PF

D504

BAV99W

3

1

2

R519

22K

C513
22PF

TP508

1

C512
100NF

+

-

U501

TSV521ICT

1

+IN

3 -IN

2

V-

5

V+

4

OUT

R518
100K

C510

100NF

C509

100NF

R520
330R

C508

2.2 µF

R517

1M

CURRENT_DEMOD

VBUS

ISENSE

VTARGET
QFOD_ADC

TANK_VOLTAGE

15

VTARGET

16

QFOD_ADC

17

COIL_TEMP

18

ISENSE

19

VMAIN

20

CURRENT_DEMOD

12

TANK_VOLTAGE

CURRENT_DEMOD

C501, R518, R519
near Current_demod input
(U500 pin 12)

Current demod (U501, R and C) near
Current amplifier output (Q301)

8.4 Current sensing and demodulation

Figure 66: STEVAL-ISB044V1 evaluation board: current sensing

Figure 67: STEVAL-ISB044V1 evaluation board: current demodulation

UM2301

References

DocID031141 Rev 1

55/57

9 References

Freely available on www.st.com:

1. STWBC-EP datasheet

2. STEVAL-ISB044V1 data brief (DB3408): "Qi MP-A10 15 W wireless charger TX
evaluation kit based on STWBC-EP"

3. STSW-ISB044FW data brief (DB3409): "Firmware for the STEVAL-ISB044V1 wireless
power transmitter evaluation board based on STBWC-EP"

4. STSW-STWBCFWDT data brief (DB3410): "STWBC firmware downloader tool"

5. STSW-STWBCGUI data brief (DB3418): "Graphical user interface for wireless power
transmitter evaluation boards based on the STWBC chip family"

Revision history

UM2301

56/57

DocID031141 Rev 1

10 Revision history

Date

Version

Changes

1

Initial release.

30-Oct-2017

Table 7: Document revision history

UM2301

DocID031141 Rev 1

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