ST STEVAL-ISB68RX User manual

Introduction
The STEVAL-ISB68RX is an evaluation board based providing a Qi-compliant (Qi specifications 1.2.4) reference solution for a
wireless power receiver with 5 W capability and based on the STWLC68JRH chip.
The STEVAL-ISB68RX consists of a PCB housing the STWLC68JRH and a 40 x 40 mm receiving coil: the two elements are
mechanically mated through a plastic frame that also acts as 1.5 mm plastic spacer for the coil. The PCB board also embeds a
USB-to-I2C converter that directly interfaces with the STWLC68JRH, allowing the user to modify parameters and settings via a
Graphical User Interface (GUI). The converter can be conveniently used to configure and control the final application via I2C
bus.
The STEVAL-ISB68RX has a default setting for a 5 V output voltage and full compliance with Baseline Power Profile (BPP).
Figure 1. STEVAL-ISB68RX
Getting started with the wireless power evaluation board for Qi inductive receiver
with STWLC68JRH
UM2681
User manual
UM2681 - Rev 1 - February 2020
For further information contact your local STMicroelectronics sales office.
www.st.com

1Board overview
The STEVAL-ISB68RX evaluation board default configuration is optimized for performance.
The board features:
• STWLC68JRH wireless power receiver chip with up to 5 W output power capability (Qi specification 1.2.4,
BPP)
• Constant 5 V output voltage (default setting)
• Total (TX input to RX output) system efficiency up to 80%
• Foreign Object Detection (FOD) supported
• 400 kHz I2C interface for communication with host system (optional)
•Built-in USB-to-I2C converter for interfacing to STWLC68JRH chip
• Configurable GPIOs (e.g. status monitoring or auxiliary control signals)
• Solder pads matrix for customization of evaluation board
• Complete kit (Board with embedded receiving coil, Graphical User Interface control software)
• RoHS compliant
UM2681
Board overview
UM2681 - Rev 1 page 2/18

2Board configuration and test points
The STEVAL-ISB68RX has several connectors and test points to ease access to key signals.
• P1 connector: micro-USB female receptacle for connection of the USB-to-I2C converter to the host PC
• P2 connector/jumper: bridging point between the I2C bus (on-board converter) and the STWLC68JRH.
Jumpers placed as per Figure 3 allow controlling the STEVAL-ISB68RX via GUI. If the jumpers are removed,
the connector turns into the I2C bus access point for controlling external STWLC68JRH devices.
• P3 & P4 connectors: grounding points for probing.
• P5 connector: auxiliary STWLC68JRH control signals access point. Programmable GPIOs, chip enable and
other STWLC68JRH pins are routed to this connector.
• J3 jumper (VBUS->VOUT): this jumper connects the 5 V supply rail of the USB to the output of
STWLC68JRH. It is used to communicate with STWLC68JRH when the receiver is not placed on a
transmitter (DC mode). Also used to supply the STWLC68JRH chip during OTP flashing. If closed, the
STEVAL-ISB68RX should not be put on transmitter.
• TP2: test-point connected to AC2 (rectifier input of STWLC68JRH).
• TP3: test-point connected to AC1 (rectifier input of STWLC68JRH).
• TP4: test-point connected to internal V1V8 LDO output (STWLC68JRH digital section supply rail).
• TP5: test-point connected to internal V5V0 LDO output (STWLC68JRH analog section supply rail).
• TP6: test-point connected to IEXT pin. Used to monitor the operation of the over-voltage protection (active
clamper).
• VRECT connector: rectifier output voltage (VRECT pins of STWLC68JRH)
• VOUT/GND connectors: main linear LDO regulator output voltage (VOUT pins of STWLC68JRH). Power
output rail of the wireless power receiver.
• COIL connector: terminals for the receiving coil.
Figure 2. Top silkscreen of evaluation board
UM2681
Board configuration and test points
UM2681 - Rev 1 page 3/18

3Operating mode
The STEVAL-ISB68RX works out-of-the-box as a standalone wireless power receiver when placed on a suitable
transmitter. Default settings are automatically retrieved from OTP memory at power-up.
The Graphic User Interface allows the user evaluating all the available functions of the STEVAL-ISB68RX, as well
as temporary changing the default parameter via I2C communication.
The jumpers at connector P2 must be closed as shown in Figure 3 to connect the STWLC68JRH to the USB-to-
I2C converter, then a USB cable can be plugged into P1 to connect the STEVAL-ISB68RX to the host PC. Before
launching the GUI on the host PC, the STEVAL-ISB68RX should be placed on an active transmitter, so that the
STWLC68JRH is properly powered and the I2C communication established.
Note: The enable pin of the STWLC68JRH is held low by the USB-to-I2C converter resulting in reset state of
STWLC68JRH. By the opening the GUI, the USB-to-I2C converter is initialized and the STWLC68JRH is
enabled.
Figure 3. Configuration of jumpers
The D1 LED is connected to the GPIO0 pin of the STWLC68JRH and it lights up when the output of the main
LDO linear regulator is enabled, i.e. when power transfer is established between the transmitter and the STEVAL-
ISB68RX.
UM2681
Operating mode
UM2681 - Rev 1 page 4/18

Figure 4. Output and indication LED
The STEVAL-ISB68RX has three additional LEDs dedicated to the USB-to-I2C converter: D8 LED indicates the
correct initialization, D6 LED indicates I2C bus activity and D5 LED is the power-on indicator (USB supply rail).
Figure 5. Status LEDs
UM2681
Operating mode
UM2681 - Rev 1 page 5/18

4Default configuration of STWLC68JRH
The configuration settings of the STWLC68JRH chip are retrieved from the OTP memory at power-up, but they
can be temporary changed via GUI once the STEVAL-ISB68RX is powered by the transmitter and the modified
values are kept until a reset of chip occurs.
The default STWLC68JRH settings are the following ones:
• The output voltage is set to 5.0 V.
• The output is disabled if the VRECT voltage is lower than 4 V. This threshold is programmable, and it is used
to prevent the supply voltage of the STWLC68JRH from being too low because of severe output load
transient or TX/RX coils misalignment.
• The output current limit is set to 1.5 A.
• The INTB pin is set as open-drain and it is assigned to over-temperature, over-current and over-voltage
protections interrupts.
• The dummy load is set to 40 mA. All wireless power systems are designed to transfer a minimum amount of
power, below which the ASK modulation and the output voltage regulation are not well controlled. To
overcome these problems and to ensure proper RX-to-TX communication stability, a dummy load function
can be enabled. The dummy load is a constant current internally drawn at the VOUT output and it
progressively fades away as soon as the external load increases. The default 40 mA value is a good trade-
off between internal power dissipation at no load and ASK communication stability over the full output power
range.
• A deeper ASK modulation index is enabled when the output current is lower than 100 mA. The
STWLC68JRH has two pairs of pins dedicated to ASK modulation. In normal conditions only the COMM1
and COMM2 pins are used. In light-load conditions the CLAMP1 and CLAMP2 pair can be activated to
provide a deeper ASK modulation that significantly enhances the RX-to-TX communication signal-to-noise
ratio.
• The output of STWLC68JRH is automatically enabled when the voltage at VRECT (output of the rectifier)
crosses 5.08 V threshold.
• The nominal STWLC68JRH idle current is set to 17 mA. This current is application-dependent and reflects
the consumption of the chip and the circuitry eventually connected to V5V0 and V1V8 pins. The value of the
current is important for the correct tuning of the Foreign Object Detection function.
• The GPIO0 pin is set as open-drain output and assigned to D1 LED, so that it lights on when the output is
enabled.
The STWLC68JRH implements over-temperature, over-voltage and over-current protections to prevent
damage to the chip itself, to the load and to the external components. The device has two internal
temperature sensors, physically located close to the rectifier and to the main LDO linear regulator.
• The default setting for the over-temperature protection consists in disabling the output and sending EPT
packet to the transmitter in case one of the above-mentioned sensors detects more than 80 °C. As a further
protection, a second, higher threshold of 125 °C triggers an internal circuitry that shorts to ground both AC1
and AC2 pins.
• The protection based on external NTC sensor is disabled by default. This function is mostly used to monitor
and protect the receiving coil against over-heating.
• The over-voltage protection the STWLC68JRH monitors the voltage at the output of the rectifier. A lower
threshold (set by default to 12 V) triggers a momentary VRECT clamper: the IEXT pin goes low and a
discharge current flows through the external resistor connected between VRECT and IEXT. This action is
effective in reducing the VRECT voltage and generally it is intended to take place in case of brief, non-
repetitive voltage spikes at VRECT (for example due to abrupt change in the coupling factor of the RX/TX
coils). Usually this protection does not interrupt the power transfer process. In STEVAL-ISB68RX the default
settings associate an EPT packet generation to this protection too, therefore the power transfer is terminated
by the transmitter.
A higher threshold, set to 25 V, triggers the already mentioned AC1-AC2 short-to-ground mechanism as a
further safety.
• The output over-current protection is set to 1.5 A, resulting in output disconnection an EPT packet
generation once triggered.
UM2681
Default configuration of STWLC68JRH
UM2681 - Rev 1 page 6/18

5Graphical User Interface (GUI)
The GUI offers a user-friendly interface to access and modify the STWLC68JRH registers. The same GUI is the
tool, in conjunction with the on-board USB-to-I2C converter, to rely on for eventually tuning the final application.
Figure 6 shows how to change the output voltage of the STEVAL-ISB68RX on-the-fly from the registers page. By
acting on the slider (or directly writing the desired value) and writing the related register, a new value is set.
Note: Increasing the output voltage may impact on the external components (e.g. proximity to maximum voltage rating
of VRECT and VOUT capacitors) and on some setting (the OVP threshold, for example, could be triggered if not
conveniently adapted to the new operating conditions). Some transmitters may have inherent limitations and
could terminate the power transfer if significant changes in the output voltage are applied.
Figure 6. Changing of output voltage via GUI
The GUI also allows to monitor in real-time key parameters by reading the internal ADC channels of the
STWLC68JRH and plotting voltages, current and temperatures. Figure 7 shows the behavior of VRECT and
VOUT voltages, as well as the rectifier output current (ISNS). For further details and a comprehensive description
of the GUI, please refer to the GUI user manual on www.st.com
UM2681
Graphical User Interface (GUI)
UM2681 - Rev 1 page 7/18

Figure 7. Plotting key parameters via GUI
UM2681
Graphical User Interface (GUI)
UM2681 - Rev 1 page 8/18

6Baseline power profile (BPP) RX mode performance
Figure 8 reports the typical TX-input to RX-output efficiency of the STEVAL-ISB68RX placed on open-loop
transmitter.
Figure 8. STEVAL-ISB68RX evaluation board performance: efficiency vs output power in BPP
UM2681
Baseline power profile (BPP) RX mode performance
UM2681 - Rev 1 page 9/18

7Schematic
Figure 9. Schematic of STEVAL-ISB68RX
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
D D
C C
B B
A A
Title
Number RevisionSize
A3
Date: 20.1.2020 Sheet of
File: C:\Users\..\STWLC68 evaluation board steval v3.1.SchDocDrawn By:
RSTB
SDA
SCL
INTB
GPIO0
GPIO1
GPIO2
GPIO3
GPIO4
1
2
3
4
5
6
7
8
9
10
11
12
P5
Header 12
PGND
1 2
VRECT
PGND
VRECT
VOUT
PGND
22nF
CM2
22nF
CL2
47nF
CBT2
22nF
CM1
22nF
CL1
47nF
CBT1
VRECT
VSSA
VSSA
CLAMP2
CLAMP1
VGATE
VOUT
VSSA
VSSA
VSSA
COMM2
COMM1
VOUT
VOUT
VOUT
VSSD
VSSA V5V0 BOOT1 BOOT VS VOUT VSSD VSSD VSSA VSSA V5V0 NTC DFT VSSD VSSD VSSD V1V8 VSSA
VSSA
V1V8
GPIO1
GPIO0
VSSD
VSSD
VSSD
VSSD
VSSD
SCL
GPIO5
GPIO4
GPIO3
GPIO2
BOOT_SEL
RSTB
INTB
SDA
VSSP AC2 AC2 VRECT VRECT AC1 AC1
VSSP VSSP AC2 AC2 VRECT VRECT AC1 AC1 VSSP BOOT2 IEXT
D3
SMAJ22A
D2
SMAJ22A
PGNDPGND
BOOT2
CLAMP2
COMM2
BOOT1
CLAMP1
COMM1
AC2 AC1
3.9nF
CPAR
100nF
CS1
100nF
CS2
100nF
CS3
100nF
CS4
1 2
COIL
COIL
COIL 1 COIL 2
1K
R10
NC
R11
AGND
4.7nF
CBT V1V8
VRECT
1uF
C3
100nF
C4
V1V8
AGND
10uF
CR1
10uF
CR2
10uF
CR3
100nF
CR4
VRECT
AGND
10uF
CO1
10uF
CO2
10uF
CO3
100nF
CO4
VOUT
AGND
4.7uF
C5
100nF
C6
V5V0
AGND
91R
R1
91R
R2
91R
R3
VRECTIEXT
100K
R8
DGND
4.7K
R4
4.7K
R5
VDDMCP_SCL
MCP_SDA
GND
GND
470nF
C9
GND
SCL
SDA
1M
R9
100pF
C10
GND GND GND
100nF
C7
2.2uF
C8
GND GND
220R
R12
D6
LED
VDD
MCP_RSTB
MCP_INTB
AGNDPGNDDGND
VSSA VSSP VSSD
GND
1 2
J3
VOUT
10K
R6
10K
R16
PGND
RSTB
MCP_RSTB
V1V8
G
S D 32
1
Q1
FDV303N
I2C communication
STWLC68 is working without TX
STEVAL-ISB68RX
I/O1
1
GND
2
I/O2
3I/O2 4
VBUS 5
I/O1 6
U3
USBLC6-2SC6
GP0
1
GP1
2
RST
3
URx
4
UTx
5
GP2
6
GP3
7
SDA
8
SCL 9
VUSB 10
D- 11
D+ 12
VSS 13
NC 14 NC 15
VDD 16
U2
MCP2221
D8
LED
220R
R14
D5
LED
470R
R13
VBUS
GND
VBUS
S1
SW-SPST
100nF
C1
RST
RST
GND
D4
STPS1L60ZFY
GND GND
0.47R
R15
VGATE
D
1
D
2
G
3S4
D5
D6
D
7
S
8
U4
STL7N6F7
VRECT
CS5
DFT
Uni-Directional Uni-Directional
1
2
3
4
GND
Header 4
1
1
P3
1
1
P4
VBUS
1
D-
2
D+
3
ID
4
GND
5
Shield
Shell
P1
MicroUSB
VSSP_S A1
AC2_S A2
AC2 A3
VRECT A4 VRECT A5
AC1 A6
VSSP B1
AC2 B2 AC2 B3
VRECT B4 VRECT B5
AC1 B6
BOOT2 C1
IEXT C2
STWLC68 / Vega
VRECT_S
C3
VSSA
C4
VSSA_S
C5
NC
C6
VGATE
D1
VOUT
D2
VSSA
D3
VSSA
D4
VSSA
D5
NC
D6
VOUT
E1
VOUT
E2
VOUT_S
E3
VSSD
E4
VSSA_S
G6 V1V8_S G5 VSSD G4 VSSD G3 VSSD G2 DFT G1
VSSA
F6 VSSA F5 VSSD F4 VSSD F3 VOUT F2 VS F1
V5V0_S
E6 VSSA E5
GPIO1 H1
GPIO0 H2
VSSD_S H3
VSSD H4
VSSD H5
VSSD H6
GPIO5 J1
AC1_S A7
VSSP A8
AC1 B7
VSSP B8
CLAMP2
C7
CLAMP1
C8
COMM2
D7
COMM1
D8
BOOT1
E7
BOOT
E8
V5V0
F7
NTC
F8
VSSA G7
V1V8 G8
VSSD H7
SCL H8
GPIO4 J2
GPIO3 J3
GPOI2 J4
BOOT_SEL J5
RSTB J6
INTB J7
SDA J8
U1
STWLC68
V5V0
TP4
1 2 3 4
VOUT
4.7K
R17
MCP_INTB
TP5
TP6
TP2 TP3
TP7
1uF
C2
GND
GND
VDD
VBUS
VBUS
VDD
VDD
VIN
1
INHIBIT
3NC 4
VOUT 5
GND
2
U5
LD2981
v2.0
MCP_SCL
MCP_SDA
GND GND
MCP_INTB INTB
1
2
3
4
5
6
7
8
P2
Header 4X2A
100R
R7
D1
LED0
V1V8GPIO0
Coil Protections
RESET LED
STWLC68 3.3V LDO
USB-I2C convertor
Decoupling caps Connectors
Pull up resistors
DC mode
UM2681
Schematic
UM2681 - Rev 1 page 10/18

8BOM
Table 1. Bill of material
Item Q.ty Ref. Value Description Manufacturer Part number
1 10
C1, C4,
C6, C7,
CO4,
CR4,
CS1,
CS2,
CS3,
CS4
100nF, 1005[0402], 50 VDC V,
10%,
Multilayer
Ceramic
Capacitors
MLCC -
SMD/SMT
Murata GCM155R71H104KE02D
2 6
CO1,
CO2,
CO3,
CR1,
CR2,
CR3
10uF, 2012[0805], 35 VDC V, 10%,
Multilayer
Ceramic
Capacitors
MLCC -
SMD/SMT
Murata GRM21BR6YA106KE43L
3 6
TP2,
TP3,
TP4,
TP5,
TP6, TP7
TestPoint 1.5/0.8, Do not place DNP
4 4
CL1,
CL2,
CM1,
CM2
22nF, 1005[0402], 50 VDC V, 10%,
Multilayer
Ceramic
Capacitors
MLCC -
SMD/SMT
Murata GRT155R71H223KE01D
5 3 R1, R2,
R3
91R, 2012[0805], 91 R V, 500 m
W, 5%,
Thick Film
Resistors -
SMD
Panasonic P91ADCT-ND
6 3 R4, R5,
R17 4.7K, 1005[0402], Resistor Any
7 2 C2, C3 1uF, 1005[0402], 25 VDC V, 10%,
Multilayer
Ceramic
Capacitors
MLCC -
SMD/SMT
Murata GRM155R61E105KA12D
8 2 CBT1,
CBT2 47nF, 1005[0402], 50 VDC V, 10%,
Multilayer
Ceramic
Capacitors
MLCC -
SMD/SMT
TDK C1005X7R1H473K050BB
9 2 D2, D3 DO-214AC (SMA), 22 VDC V, ESD
Suppressors SMAJ22A
10 2 GND,
VOUT HDR1X4,
Header 1x4
pin, 2.54mm
pitch
Header, 4-Pin
11 2 J3,
VRECT HDR1X2,
Header 1x2
pin, 2.54mm
pitch
Header, 2-Pin
12 2 P3, P4 2mm_PIN, Do not place DNP
13 2 R12, R14 220R, 1005[0402], Resistor Any
14 2 R6, R16 10K, 1005[0402], Resistor Any
UM2681
BOM
UM2681 - Rev 1 page 11/18

Item Q.ty Ref. Value Description Manufacturer Part number
15 1 D5 Q_SMD_LED_0603_DIN1608M, 2
VDC V, 20 m A, RED LED Wurth Electronik 150060RS55040
16 1 D6 Q_SMD_LED_0603_DIN1608M, 2
VDC V, 20 m A, GREEN LED Wurth Electronik 150060VS55040
17 1 D8 Q_SMD_LED_0603_DIN1608M, 2
VDC V, 20 m A, YELLOW LED Wurth Electronik 150060YS55040
18 1 C10 100pF, 1005[0402], Capacitor Any
19 1 C5 4.7uF, 1005[0402], 10 VDC V,
20%,
Multilayer
Ceramic
Capacitors
MLCC -
SMD/SMT
Murata GRM155R61A475MEAAD
20 1 C8 2.2uF, 1005[0402], 6.3 VDC V,
20%,
Multilayer
Ceramic
Capacitors
MLCC -
SMD/SMT
Murata GRM155R60J225ME95D
21 1 C9 470nF, 1005[0402], 16 VDC V,
10%,
Multilayer
Ceramic
Capacitors
MLCC -
SMD/SMT
Murata GRM155R61C474KE01D
22 1 CBT 4.7nF, 1005[0402], 50 VDC V,
10%,
Multilayer
Ceramic
Capacitors
MLCC -
SMD/SMT
Murata GCM155R71H472KA37D
23 1 COIL 8uH, HDR1X2, Coil 760308102207
24 1 CPAR 3.9nF, 1005[0402], 50 VDC V,
10%,
Multilayer
Ceramic
Capacitors
MLCC -
SMD/SMT
Murata GRM155R71H392KA01D
25 1 CS5 DNP, 1005[0402], Do not place DNP
26 1 D1 Q_SMD_LED_0603_DIN1608M, RED LED Wurth Electronik 150060RS55040
27 1 D4 SOD-123, 60 VDC V, 1 A, Schottky
Rectifiers STMicroelectronics STPS1L60ZFY
28 1 P1 MICROUSB-629105150921,
Fermale Micro
USB Type AB
Connectors
Wurth Elektronik 629105150921
29 1 P2 HDR2X4_CEN,
Header 2x4
pin, 2.54mm
pitch
Header, 4-Pin, Dual row
30 1 P5 HDR1X12,
Header 1x12
pin, 2.54mm
pitch
Header, 12-Pin
31 1 Q1 G_SMD_SOT23_TO-236AB, 25
VDC V, Id 680 mA, MOSFET ON Semiconductors FDV303N
32 1 R10 1K, 1005[0402], Resistor Any
33 1 R11 DNP, 1005[0402], Do not place DNP
34 1 R13 470R, 1005[0402], Resistor Any
35 1 R15 0.47R, 2012[0805], 250 mW, Current Sense
Resistors Susumu RL1220S-R47-F
UM2681
BOM
UM2681 - Rev 1 page 12/18

Item Q.ty Ref. Value Description Manufacturer Part number
36 1 R7 100R, 1005[0402], Resistor Any
37 1 R8 100K, 1005[0402], Resistor Any
38 1 R9 1M, 1005[0402], Resistor Any
39 1 S1 SWITCH_P-DT2112C, 12 VDC V,
50 mA, Tactile Switche P-DT2112C
40 1 U1 WLC68_72BUMPS, Wireless
charging IC STMicroelectronics STWLC68
41 1 U2 QFN16, USB Interface
IC Microchip MCP2221A-I/ML
42 1 U3 SOT23-6L, ESD
Suppressors STMicroelectronics USBLC6-2SC6
43 1 U4 PowerFLAT, VDS 60 VDC V, Id 7
A, MOSFET STMicroelectronics STL7N6F7
44 1 U5 SOT23-5L, 3.3 VDC Output V, 100
mA Output A,
LDO Voltage
Regulators STMicroelectronics LD2981CM33TR
45 1 Plastic
case
46 4 Jumpers Sullins Connector
Solutions QPC02SXGN-RC
UM2681
BOM
UM2681 - Rev 1 page 13/18

Revision history
Table 2. Document revision history
Date Version Changes
20-Feb-2020 1 Initial release.
UM2681
UM2681 - Rev 1 page 14/18

Contents
1Board overview....................................................................2
2Board configuration and test points................................................3
3Operating mode ...................................................................4
4Default configuration of STWLC68JRH .............................................6
5Graphical User Interface (GUI) .....................................................7
6Baseline power profile (BPP) RX mode performance ...............................9
7Schematic ........................................................................10
8BOM..............................................................................11
Revision history .......................................................................14
Contents ..............................................................................15
List of tables ..........................................................................16
List of figures..........................................................................17
UM2681
Contents
UM2681 - Rev 1 page 15/18

List of tables
Table 1. Bill of material ..................................................................... 11
Table 2. Document revision history ............................................................. 14
UM2681
List of tables
UM2681 - Rev 1 page 16/18

List of figures
Figure 1. STEVAL-ISB68RX .................................................................1
Figure 2. Top silkscreen of evaluation board ......................................................3
Figure 3. Configuration of jumpers .............................................................4
Figure 4. Output and indication LED ............................................................5
Figure 5. Status LEDs......................................................................5
Figure 6. Changing of output voltage via GUI ......................................................7
Figure 7. Plotting key parameters via GUI ........................................................8
Figure 8. STEVAL-ISB68RX evaluation board performance: efficiency vs output power in BPP....................9
Figure 9. Schematic of STEVAL-ISB68RX ....................................................... 10
UM2681
List of figures
UM2681 - Rev 1 page 17/18

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STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, enhancements, modifications, and improvements to ST
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