STMicroelectronics Wireless charger transmitter evaluation board based on STWBC-WA for wearable applications User Manual
STMicroelectronics Wireless charger transmitter evaluation board based on STWBC-WA for wearable applications is a tool for quick evaluation of the wireless charger transmitter unit component for wearable applications. Wireless charger transmitter unit component of the STEVAL-ISB038V1 wireless charging reference design for wearable applications is a tool to transfer up to 1 watt of power to devices that require the use of small coils, and can be modified up to 3 watts. It is optimized to be used for ultra-compact battery-operated devices, such as wearable gear, smartwatches, IoT sensors, and healthcare devices.
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UM2099
User manual
Wireless charger transmitter evaluation board based on
STWBCWA for wearable applications
Introduction
STEVALISB038V1T is the wireless charger transmitter unit component of the STEVALISB038V1 wireless charging reference design for wearable applications. It is based on the STWBCWA and is designed to transfer up to 1 watt of power to wireless power to devices requiring the use of small coils. It can be modified to deliver up to 3 watts.
The STEVALISB038V1 is a wireless battery charger reference design evaluation kit designed for ultra compact battery operated devices, such as wearable gear, smartwatches, Internet of Things sensors and healthcare devices.
The design is optimized for 1watt wireless power transfer with a halfbridge topology on the transmitter side and with tiny 11 mm and 20 mm coils on the receiver and transmitter sides, respectively. For power transfers up to 3 watts, the design can be modified by using larger coils and a fullbridge configuration on the transmitter.
The STWBCWA transmitter can support a costeffective halfbridge topology (fullbridge optional) and a powerful software API lets you modify the behavior of LED and general purpose IOs as well as connecting external peripherals or devices like sensors to the design via the onchip I²C and UART ports.
The STWLC04 is designed for 1watt power transfer based on the Qi protocol, with digital control and precise analog control loops ensuring stable operation. The I²C interface allows a high degree of customization and settings can be stored in the embedded nonvolatile memory.
Figure 1: STEVAL-ISB038V1T transmitter evaluation board
January 2017 DocID029619 Rev 3 1/44 www.st.com
Contents
Contents
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System requirements ........................................................................ 5
Package contents .............................................................................. 5
2 Hardware description and setup .................................................... 6
System block diagram ....................................................................... 6
STEVALISB038V1T wireless transmitter board ............................... 6
STWBCWA pinout and pin description .......................................... 10
3 Download procedure ..................................................................... 12
STWBC GUI software installation ................................................... 12
Firmware download with STWBC GUI ............................................ 12
Download procedure with a new chip (never programmed) ............. 13
Firmware upgrade procedure (chip already programmed) ............... 15
Erasing firmware procedure using STVP ........................................ 16
Requirements ................................................................................... 16
Firmware download via UART using the command line interface ... 20
With written chip ............................................................................... 20
With blank chip ................................................................................. 20
STVP file creation to download with STVP ..................................... 20 3.5
Firmware download with STVP ....................................................... 22
4 Setting up the evaluation equipment ........................................... 24
5 GUI and evaluation procedure ...................................................... 25
Status LEDs .................................................................................... 31
6 Schematic diagrams ...................................................................... 32
7 Transmitter bill of materials .......................................................... 35
8 Transmitter board assembly and layout ...................................... 39
Design considerations ..................................................................... 39
Power signals (5V, GND and LC power node) ................................. 39
Sensitive signals ............................................................................... 40
10 Revision history ............................................................................ 43
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List of tables
List of tables
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List of figures
List of figures
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1
1.1
1.2
Getting started
Getting started
System requirements
The GUI for the STEVALISB038V1T board requires Microsoft Windows XP ® or later plus
NET Framework 4. The PC and the board are connected with a USBtoUART cable.
Package contents
To evaluate the STEVALISB038V1T board, ensure you have:
• Hardware:
− STEVALISB038V1T board
− STLINK/V2 incircuit debugger/programmer with single wire interface module
(SWIM) available for download from www.st.com
− USB to UART interface cable with microUSB connection in order to use the GUI and to supply the board.
• Software:
− STLINK USB driver
− STVP programming tool from STMicroelectronics (integrated into STVD tools)
− FTDI VCP driver http://www.ftdichip.com/Drivers/VCP.htm
− PC GUI installation package
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Hardware description and setup
2
2.1
Hardware description and setup
System block diagram
Figure 2: Block diagram
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2.2 STEVAL-ISB038V1T wireless transmitter board
The STEVALISB038V1T board features:
• STWBCWA based wireless power transmitter
− Additional transmitter module compatible with the STEVALISB038V1 reference kit
− Cost effective Half Bridge topology with integrated drivers
− Optional Full Bridge configuration for 3 W applications
− Active presence detector
− 2layer PCB for easy design
− Turnkey solution or customizable via APIs
− Parametric customization via graphical interface
• Full KIT characteristics:
− 11 mm coil on Receiver
− 20 mm coil on Transmitter
− 1 Watt delivered on Receiver side
− USB 5 V input
− Foreign Object Detection (FOD) optional
− Graphical interface for monitoring behavior
− Total reference design
− RoHS compliant
• STWLC04 wireless power receiver
− Output voltage: 5 V regulated voltage
− Integrated high efficiency synchronous rectifier
− LiIon/LiPol charger functionality
− 4layer PCB for easy design
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Parameter
Input characteristics
Vin
Iin
Hardware description and setup
Table 1: STEVAL-ISB038V1T electrical performance
Description Notes and conditions Min. Typ. Max. Unit
Input Voltage
Input current
Input Noload current
Input Standby current
Vin nominal, Iout = Max
4.75 5 5.5
0.4 0.6
V
A mA mA
System characteristics
FS ƞ
Switching frequency
Full load efficiency decrease with load
Vin = 5 V, RX_Power= 1
W
110
205 kHz
%
Notes:
(1) Efficiency data related to the use of the 15mm TDK coil (WT15151222F2)
Figure 3: STEVAL-ISB038V1T evaluation board with SWIM connector
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Hardware description and setup
Figure 4: Board silkscreen top layer
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Figure 5: Board silkscreen bottom layer connector reference
J1
J2
J3
J4
J5
J6
Test point reference
TP1
TP2
TP3
TP4
TP5
TP6
TP7
TP8
TP9
Table 2: Connector description
Description
USB to UART connector for GUI and board supply
SWIM connector for the download
VBUS/external power supply connection
VBUS/GND connection
USB male connector
USB female connector
Table 3: Test points
Signal
+5 V
USB_DM
GND
USB_DP
PWM_AUX/GPIO_2
UART_TX
UART_RX
WAVE_SNS
LEDR
Description
5 V input voltage
USB signal
Ground
USB signal
PWM output or GPO
UART Tx signal
UART Rx signal
Comparator 0 input for symbol detection
LED Red signal
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Hardware description and setup
Test point reference
TP10
TP11
TP12
2.3
Signal
LEDG
ISENSE
GND
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Description
LED Green signal
ADC input for current measurement
Ground
STWBC-WA pinout and pin description
Figure 6: STWBC-WA pin configuration
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Pin number
1
2
3
4
5
6
Pin name
Table 4: Pinout description
Pin type
Turnkey firmware description
DI Uart RX link
DO Not used, must not be connected to any potential inactive (internal pull up) inactive (internal pull up)
DRIVEOUT[3]
DO
DO
Output driver for Full Bridge configuration (optional)
Digital output for the green light indicator
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Pin number
7
8
9
10
26
27
28
22
23
24
25
29
30
31
32
19
20
21
15
16
17
18
11
12
13
14
Notes:
(1) This pin behavior can be configured via API
Pin name
CPP_INT_3
CPP_INT_2
CPP_REF
CPP_INT_1
CPP_INT_0
VDDA
VSSA
RESERVED
RESERVED
NTC_TEMP
ISENSE
VMAIN
DRIVEOUT[0]
DRIVEOUT[1]
DRIVEOUT[2]
SWIM
NRST
VDD
VSS
VOUT
Hardware description and setup
AI
AI
PS
PS
AI
Pin type
DO
AI
AI
AI
Turnkey firmware description
Digital output for the red light indicator
Connected to GND
Connected to GND
External reference for CPP_INT_3 (if not used, must be tied to GND)
Connected to GND
Wave_sns signal for symbol detection
Analog power supply
Analog ground
Reserved
Reserved
Connected to USB_ID signal
NTC temperature measurement. AI
AI
AI
DO
DO
DO
LC Tank Current measurement
Vmain Monitor
Output driver for Low side branch inactive (internal pull up) inactive (internal pull up)
Output driver for high side branch
Output driver for Full Bridge configuration (optional)
DIO
DI
Not connected
Debug interface
Reset
PS
PS
Digital and I/O Power supply
Digital and I/O Ground
Supply Internal LDO output
DO Uart TX link
AlI analog inputs are VDD compliant, but only between 0 and 1.2 V can be used
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Download procedure
3
3.1
Download procedure
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The firmware can only be downloaded to the board via the GUI software, which also provides comprehensive board monitoring features.
STWBC GUI software installation
1 Install the GUI by launching the STWBC_GUI_Setup.msi installer file.
2 Connect the wireless power transmitter board to the PC with a USBtoUART cable.
3 Select the appropriate USB serial Com port. You can check Windows Device Manager to identify the correct port number. If the com port is not listed in the selection window, enter it in the Special textbox (e.g., “COM12”).
Figure 7: STWC Qi GUI start screen
3.2
4 Press “OK”
The GUI is ready to run.
Firmware download with STWBC GUI
The GUI lets you download firmware via UART. The download contains three files incorporated in a single cab file.
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3.2.1
Download procedure
Download procedure with a new chip (never programmed)
If the chip has never been programmed (i.e., a new chip from STMicroelectronics), download mode is enabled by default.
1 Connect the USB to UART dongle to the computer. Do not connect the transmitter board for the moment.
Figure 8: PC to USB-to-UART dongle connection
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Download procedure
2 From the STWBC Qi GUI, select Load FW to board from the Setup menu.
Figure 9: Firmware download with STWBC Qi G
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3 As prompted, select the CAB file containing the Firmware to download.
4 As prompted, Power on the board and keep it powered.
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5 When the DOS window appears, connect the transmitter board to the dongle with a microUSB cable.
Figure 10: USB-to-UART dongle to STEVAL-ISB038V1T transmitter board connection
6 You can follow the download progress in the DOS window. Power off the board when prompted.
Figure 11: Firmware download progress window
3.2.2 Firmware upgrade procedure (chip already programmed)
If a chip has already been programmed with firmware, the download mode is disabled and special command needs to be sent to STWBCWA to enable the download mode.
1
2
Connect the transmitter board to the USB to UART dongle; the transmitter board is powered through this dongle. The UART RX/TX signals of the STWBCWA are accessible on the microUSB connector of the transmitter board (USB_DP and
USB_DM, respectively).
see Figure 10: "USB-to-UART dongle to STEVAL-ISB038V1T transmitter board connection"
From the STWBC Qi GUI, select Load FW to board from the Setup menu.
see
Figure 9: "Firmware download with STWBC Qi GUI"
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Download procedure
3
As prompted, select the CAB file containing the Firmware to download.
4
As prompted, Power on the board and keep it powered.
5
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You can follow the download progress in the DOS window. Power off the board when prompted.
see
Figure 11: "Firmware download progress window"
6
See Section 3 .3: "Erasing firmware procedure using STVP"
problems during firmware download via UART.
3.3
3.3.1
Erasing firmware procedure using STVP
The firmware can be erased using STVP if you are having problems such as firmware corruption during update.
Requirements
• STLINK USB driver installed.
• STVP programming tool from STMicroelectronics installed.
• STLINK hardware tools
• STVP configuration as per the following figure.
Figure 12: Configuration of STVP
3.3.2 Procedure
1 Target power off
2 Target power on using a microUSB cable to supply the board
3 STLINK circuit connected to the computer by USB
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4 Connect STLINK – SWIM cable with target. Pay special attention to connect the
SWIM cable to the transmitter board correctly (white strip towards the bottom).
Figure 13: ST-LINK connection on the board
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Download procedure
5
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If the debug section of the board with the SWIM connector has been removed, you can wire the SWIM, RESET and VDD_STWBC signals from R18, R5 and C5, respectively. GND can be connected on the right hand side of C1.
Figure 14: SWIM wired connection
6
7
Pin no.
1
2
3
4
Table 5: SWIM connector details on ST-LINK programmer
Name Function Target connection
VDD
DATA
GND
SWIM
GROUND
MCU VCC
MCU SWIM pin
GND
RESET RESET MCU RESET pin
Notes:
(1) The power supply from the application board is connected to the STLINK/V2 debugging and programming board to ensure signal compatibility between both boards
Launch STVP program
Select STM8AF6166 core
Figure 15: STVP core selection
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8
9
Do not load anything into the RAM area of STVP the program: all bits will be erased
(load 00 00 00 …)
Transfer the “00 00” to STWBCWA through the SWIM interface by pressing the icon
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Figure 16: STVP download
Download procedure
10 Click OK if a “Wrong device selected” alert appears.
Figure 17: STVP wrong device selected alert
11 Click YES if “An incompatibility has been found with this device” query appears.
Figure 18: STVP incompatible device action query
12 On completion of the programming procedure starts, the STVP informs the user that the program is loaded and verified.
< PROGRAM MEMORY programming completed.
> Verifying PROGRAM MEMORY area...
< PROGRAM MEMORY successfully verified.
13 Exit STVP.
14 Disconnect SWIM.
15 Remove power from the STEVALISB038V1T board.
16 Retry the UART download procedure if necessary.
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Download procedure
3.4 Firmware download via UART using the command line interface
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3.4.1 With written chip
1 Ensure a dedicated directory has the following files: a.
STWBC_Loader.exe
b.
stwbc_loader_not_empty.bat
c.
enable_boot.bin
d.
WBC_FW_QI_1W_V5.094.cab
2 Starting from the STWBC GUI folder, run the stwbc_loader_not_empty.bat from the command line, specifying the COM number (e.g., COM2) and firmware filename
(WBC_FW_QI_1W_V5.094.cab) parameters.
Figure 19: Command line
3.4.2 With blank chip
If the STWBCWA memory is erased, the sequencing of the procedure is a bit different.
1 Connect the UART cable, then select Load FW to board from the STWBC Qi GUI and power the board.
2 Execute the command line as per the example below.
Figure 20: Command line with blank chip
If the COM port number is greater than COM8, use the "\\.\COMx" syntax, where COMx is the COM port number.
3.5 STVP file creation to download with STVP
To use STVP to download the board, you must generate new files from the .cab, which you can do with the GUI.
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1 Select the Convert CAB to STVP files command from the STWBC GUI Setup menu.
Figure 21: STWBC Convert CAB to STVP menu selection
2 Follow the prompt to select the appropriate cab file.
Figure 22: Selecting cab file to convert
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Download procedure
3 Follow the prompt to provide the project file name.
Figure 23: Generated STVP project files
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3.6
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Firmware download with STVP
1 Target power off.
2 Target power on using a microUSB cable to supply the board.
3
Connect the STLINK circuit to the computer by USB
4
Connect STLINK – SWIM cable with target. Pay special attention to connect the
SWIM cable to the transmitter board correctly (white strip towards the bottom).
See
Figure 13: "ST-LINK connection on the board"
5 Launch STVP program
6 Select STM8AF6166 core see
Figure 15: "STVP core selection"
7 In STVP, select Project > Open and select the .stp file inside the zip file.
8
Wait a few moments for the confirmation message to appear.
Loading file program.hex in PROGRAM MEMORY area ...
< File successfully loaded. File Checksum 0x1D1205
Some warnings may 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!
9
10
11
12
In STVP, select Program > All tabs (on active sectors if any)
Click OK if a “Wrong device selected” alert appears.
see
Figure 17: "STVP wrong device selected alert"
Click YES if “An incompatibility has been found with this device” query appears.
see
Figure 18: "STVP incompatible device action query"
On completion of the programming procedure starts, the STVP informs the user that the program is loaded
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13
14
15
> Programming PROGRAM MEMORY area...
< PROGRAM MEMORY programming completed.
> Programming DATA MEMORY area...
< DATA MEMORY programming completed.
> Programming OPTION BYTE area...
< OPTION BYTE programming completed.
CMD13: Exit from STVP.
Disconnect SWIM
Power off the board
The IAR Tool chain can also be used to compile and download firmware.
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Setting up the evaluation equipment
4 Setting up the evaluation equipment
The following block diagram shows the setup configuration for testing.
Figure 24: Transmitter – receiver test setup
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The board is powered with a 5 V / 1 A supply and an electronic load able to draw 1 W is connected on the receiver output. Voltmeters and ammeters measure input / output voltages and currents.
The GUI is installed on the PC which is connected to the board via the USBtoUART dongle.
Figure 25: Transmitter – receiver setup with UART cable
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5
GUI and evaluation procedure
GUI and evaluation procedure
The STWBC GUI offers complete monitoring of STWBCWA operation; the main screen provides transmitter and Qi receiver status information.
Figure 26: STWBC Qi transmission status information
The STWBC GUI can also display the Rx to Tx communication protocol errors, which is helpful for system debugging.
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GUI and evaluation procedure
Figure 27: STWBC Qi Protocol window
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You can also monitor STWBCWA internal variables such as bridge voltage, Rx reported power, coil temperature, etc.
Figure 28: STWBC Qi Monitor window
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The userfriendly interface allows efficient system adjustment (thresholds, regulation error), and lets you store parameters to, and load parameters from, your computer.
Frequency and duty cycle are not available on the wearable Tx GUI.
The parameters have the following levels of protection:
1.
Level 0: parameters can be modified without protection
2.
Level 1: more critical parameters that can be modified with caution. You must “unlock param” before modifying it, but be cautious when doing so because it can lead to system malfunction or trigger behavior that is incompatible with the Qi standard.
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GUI and evaluation procedure
Figure 29: STWBC Qi Parameters window
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Parameters can be modified and their effect can tested immediately by clicking Push to target; modified parameters lose their highlighted background.
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Figure 30: STWBC Qi parameter modification (Push to target)
The STWBC GUI embeds the STWBC FW downloader interface (which uses the UART connection) and includes tools to generate binary files with adjusted parameters and build new firmware packages incorporating these files.
With the GUI, you can change the parameters and produce a new cab, which can then be used to program a batch of new boards. To do this, dump the parameters to a bin file, but only after you have clicked the Push to target button.
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GUI and evaluation procedure
Figure 31: STWBC Qi saving modified parameters (Dump to bin.)
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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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Figure 32: STWBC Qi updating firmware with new parameters
5.1 Status LEDs
The status LEDs indicate:
• Green blinking : power transfer in progress
• Green steady on : charging is complete
• Red blinking : error such as bad end of charge (battery fault), overvoltage, overcurrent, etc.
• Red steady on : the transmitter remains stuck until the receiver is removed, as per the
Qi standard (power transfer stopped three consecutive times due to appropriate power not delivered to the receiver, end power transfer due to reconfigure, no response code, FOD detection after 3 attempts)
• Red and green blinking once at startup : a watchdog reset occurred
• Red and green steady on : firmware / STWBCWA chip mismatch
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Schematic diagrams
6 Schematic diagrams
Figure 33: STEVAL-ISB038V1T transmitter control stage
NTC
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13
A VDD
29
D VD
1
1
1
1
VSSA
VSS
VSS
33
30
14
1 2 3 4
1
1
1
1
1 2
1
GSPG2007161110SG
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UPBL
DNBL
1
1
2
3
3
Q1
2
Schematic diagrams
Figure 34: STEVAL-ISB038V1T transmitter power stage
C11
10NF
+5 V DC 5V
WAVE_SNS
C12
10UF
D4
1
STL4P2UH7
R19 C14
4
5
C13
10NF
N2
N1
1K
C15 NP
C16* 47NF
6
4
5
6
Q2
* note : if not specified on the evaluation board the value is 100 nF.
VDD_STWBC
R20
1M
C17 100NF
C18 100NF
R21
100K
1NF
3
BAV99W
2
ISENSE
STL6N3LLH6
R22
470K
R24
470K
C19
10NF
Layout note : GND plan dedicated to the bridge and the power supply connector
R25
0.022R
2
R23
470K C20
10NF
Q3
BC847CDW1T1G
6
1
3
5
4
R26
10K
GSPG2007161130SG
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Schematic diagrams
Figure 35: STEVAL-ISB038V1T USB to UART dongle
2
1 ELL
ELL
SH
SH
6
5
2
1
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2
1
L2 120
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7
Transmitter bill of materials
1
Transmitter bill of materials
Table 6: STEVAL-ISB038V1T board bill of materials
Ref Part/Value Description Manufacturer
2 C1, C3 47 µF, 16 V
CAP CER X5R
1210
Murata
Part number
GRM32ER61C476ME1
5
2 1 4.7NF_50V_X7R_0402
3
4
5
6
7
8
9
10
11
12
13
14
15
16
7
3
1
2
1
1
1
2
1
3
2
1
1
1
C2
C4, C9,
C10,
C11,
C13,
C19,
C20
C5, C6,
C7
C8
C12,
C22
C14
C15
C16
C17,
C18
C21
C23,
C24,
C27
C25,
C26
D1
D2
D3
10 nF, 25 V
±15%
CAP CER X7R
0402
1 µF, 16 V
10 µF, 10 V
1 nF, 50
47 nF, 50 V
±5%
100 nF, 50 V
±5%
10 nF, 50 V
CAP CER X5R
0402
CAP CER X7R
0805
CAP CER X5R
0402
CAP NP 1206
CAP CER
C0G 1206
CAP CER
C0G 1206
CAP CER X7R
0603
47 pF, 25 V
RED, 2 V
GREEN, 2 V
CAP CER X5R
0603
High power transient voltage suppressor
LED side view
155124RS732
00
LED side view
155124VS732
00
Murata
Murata
Murata
ST
WURTH
ELEKTRONIK
WURTH
ELEKTRONIK
10NF_50V_X7R_0402
100NF_25V_X5R_040
2
1UF_16V_X5R_0402
GRM21BR71A106KE5
1L
1NF_50V_X5R_0402
C_NP_1206
GRM31M5C1H473JA0
1L
GRM31C5C1H104JA0
1L
10NF_50V_X7R_0603
100NF_50V_X7R_060
3
47PF_25V_X5R_0603
ESDA7P601U1M
LED_155124_RED
LED_155124_GREEN
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Transmitter bill of materials
17
18
19
20
21
22
23
24
25
26
27
28
29
1
1
1
2
1
1
1
1
1
1
1
1
1
Ref
D4
J1
J2
J3, J4
J5
J6
L1
L2
Q1
Q2
Q3
R1
R2
Part/Value Description
180 R
120 R, 500 mA, ± 25%
20 V, 0.087
Ohm typ., 4
A
Double diode high speed switching diode
USB_B_MICR
O_CMS
4way single row strip line connector
(male connector)
2,54 mm pitch
STRIP254P
M2
MOLEX
480370001 embase USB
2.0 type A traversant
USB_B_TRAV type A female
FERRITE
BEAD, 180
Ohm, 0603
FERRITE
BEAD, 120
Ohm, 0603,
WECBF series
Pchannel
STripFET H7
Power
MOSFET in
PowerFLAT
2x2 package
30 V, 21 mΩ typ., 6 A
45 V,100 mA, 225 mW
Nchannel
STripFET H6
Power
MOSFET,
PowerFLAT
2x2 package
XSTR,GEN
PURP,dual
NPN, SOT
363
270 nH,
±5%, 110 mA Inductor 0402
220 k Ohm
1% 1/16 W
RES 1/16W
0402 SMD
Manufacturer
WURTH
ELECTRONIK
RS
Molex
Molex
WURTH
ELEKTRONIK
Murata
WURTH
ELEKTRONIK
ST
ST
ONSemiconductors
WURTH
ELEKTRONIK
UM2099
Part number
BAV99WSOT323
629105136821
4958470
22284023
480370001
61400416021
BLM41PG181SN1
74279262
STL4P2UH7
STL6N3LLH6
BC847CDW1T1G
744784227A
220K_1%_0402
36/44 DocID029619 Rev 3
UM2099
37
38
39
43
44
45
46
47
30
31
32
33
34
35
36
40
41
42
48
1
2
2
1
4
1
5
2
1
1
3
1
Ref
R3
R4, R20
R5, R26
R6
R7, R8,
R9, R11
R10
R12,
R16,
R17,
R18,
R21
R13,
R14
R15
Part/Value
1 K/0.2 A ±
25%
1 m Ohm
1/16 W
10 k Ohm
5% 1/16 W
47 k Ohm
1% 1/16 W
0 Ohm 5%
1/16 W
180 k Ohm
5% 1/16 W
100 k Ohm
5% 1/16 W
Description
FERRITE
BEAD 0402
RES 1/16W
0402 SMD
RES 1/16W
0402
RES 1/16 W
0402 SMD
RES 1/16 W
0402 SMD
RES 1/16 W
0402
RES 1/16 W
0402
470 Ohm 5%
1/16 W
47 0K ±5%
1 k Ohm 5%
1/16 W
470 k Ohm
5%
0.022 Ohm
2%
RES 1/16 W
0402 SMD
Thermistance
CTN
RES 1/16 W
0402 SMD
RES
RES
4
1
2
2
2
1
1
R19
R22,
R23,
R24
R25
R27,
R33,
R35,
R37
R28
R29,
R32
R30,
R31
R34,
R36
U1
U2
0 Ohm 5%
1/10 W
0.0 Ohm 5%
1/10 W
330 R Ohm
5% 1/10 W
10 k Ohm
5% 1/10 W
RES 1/10 W
0603
RES NP 0603
RES 0603
RES
RES
Digital controller
UART over
USB bridge,
SSOP28
Murata
ST
FTDI
Transmitter bill of materials
Manufacturer
Murata
Yageo
Part number
BLM15AG102SN1D
1M_5%_0402
10K_5%_0402
47K_1%_0402
0R_5%_0402
180K_5%_0402
100K_5%_0402
470R_5%_0402
NCP18WB473J03RB
1K_5%_0402
470K_5%_0402
0.022_ohm_2%_0805
0R_5%_0603
R_NP_0603
RC0603JR070RL
330R_5%_0603
10K_5%_0603
STWBCWA
FT232R
DocID029619 Rev 3 37/44
Transmitter bill of materials
49
50
1
1
Ref
U3
WT2020
30
Part/Value
6.3 µH
Description
USBLC6
2SC6
Reseau de diode TVS
USB2
Wireless power charging transmitter coil
(TDK) 6.3 µH /
20 mm diameter
Manufacturer
ST
TDK
UM2099
Part number
USBLC62SC6
WT20203016M8
Notes:
(1) Wireless power charging transmitter coil WT20203016M8 can be replaced by the reference WT15151222F2 by TDK (15mm diameter)
38/44 DocID029619 Rev 3
UM2099
8
Transmitter board assembly and layout
Transmitter board assembly and layout
The evaluation board is designed using a low cost twolayer PCB, with all the components on the top side. The test points allow the user to evaluate the STWBCWA solution with probes. The UART is accessible through a microUSB connector and SWIM connection is routed to a header connector on the cuttable section of the board.
The following figure shows the main functional block divisions on the board.
Figure 36: STEVAL-ISB038V1T evaluation board functional blocks
8.1
8.1.1
Design considerations
Power signals (5V, GND and LC power node)
As the current flowing into the board can be relatively high, many vias must be used to route the 5 V and the power GND from top to bottom.
Large tracks or planes should be used for power GND, the 5 V supply voltage, VRSENSE and LC power node.
DocID029619 Rev 3 39/44
Transmitter board assembly and layout
Figure 37: STEVAL-ISB038V1T power signal layout
UM2099
8.1.2 Sensitive signals
The layout must be clean on these signals to avoid coupling.
40/44 DocID029619 Rev 3
UM2099 Transmitter board assembly and layout
Figure 38: Isense and wave_sns analog input signals routing
Figure 39: UART signals and switching signals driving the bridge
DocID029619 Rev 3 41/44
References
9
UM2099
References
1.
Datasheet : STWBCWA – Digital controller for wireless battery charger transmitters for wearable application
2.
Data Brief : STEVALISB038V1T wireless charging transmitter evaluation board based on STWBCWA
3.
User manual : STWBC 1W turnkey firmware description
42/44 DocID029619 Rev 3
UM2099
10
Revision history
Revision history
Date
Table 7: Document revision history
Version Changes
01Sep2016 1
21Nov2016
27Jan2017
2
3
Initial release.
Updated Figure 1: "STEVAL-ISB038V1T transmitter evaluation board" ,
Figure 33: "STEVAL-ISB038V1T transmitter control stage" ,
"STEVAL-ISB038V1T transmitter power stage" ,
ISB038V1T USB to UART dongle" ;
Table 6: "STEVAL-ISB038V1T board bill of materials" ;
Figure 4: "Board silkscreen top layer" ;
and Figure 36: "STEVAL-ISB038V1T evaluation board functional blocks"
Updated Table 6: "STEVAL-ISB038V1T board bill of materials"
DocID029619 Rev 3 43/44
UM2099
IMPORTANT NOTICE – PLEASE READ CAREFULLY
STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, enhancements, modifications, and improvements to ST products and/or to this document at any time without notice. Purchasers should obtain the latest relevant information on ST products before placing orders. ST products are sold pursuant to ST’s terms and conditions of sale in place at the time of order acknowledgement.
Purchasers are solely responsible for the choice, selection, and use of ST products and ST assumes no liability for application assistance or the design of Purchasers’ products.
No license, express or implied, to any intellectual property right is granted by ST herein.
Resale of ST products with provisions different from the information set forth herein shall void any warranty granted by ST for such product.
ST and the ST logo are trademarks of ST. All other product or service names are the property of their respective owners.
Information in this document supersedes and replaces information previously supplied in any prior versions of this document.
© 2017 STMicroelectronics – All rights reserved
44/44 DocID029619 Rev 3
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Key features
Cost-effective half-bridge topology and powerful software API that allows you to modify the behavior of LEDs and general purpose IOs.
Connect external peripherals through on-chip IC and UART ports.
Digital control and precise analog control loops that ensure stable operations.
Frequently asked questions
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yes
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