ST STEVAL-ISB044V1 User manual

October 2017
DocID031141 Rev 1
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www.st.com
UM2301
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
1Getting started ................................................................................. 7
1.1 System requirements........................................................................7
1.2 Package contents..............................................................................7
2Hardware 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
3Download 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
4Evaluation equipment setup ......................................................... 26
4.1 External power supply.....................................................................26
4.2 USB charger....................................................................................27
4.3 UART configuration.........................................................................27
5GUI 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
6Schematic diagram ........................................................................ 38
7Bill of materials .............................................................................. 45

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8Board 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
9References ..................................................................................... 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

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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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Hardware description and setup
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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
Table 2: STEVAL-ISB044V1 electrical performance: system characteristics
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
Figure 3: STEVAL-ISB044V1 evaluation board: connectors, LEDs and test points

Hardware description and setup
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Figure 4: STEVAL-ISB044V1 evaluation board: power supply selection
Table 3: Connector description
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
Table 4: Test point description
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