ST wireless power evaluation board User Manual
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UM2681
User manual
Getting started with the wireless power evaluation board for Qi inductive receiver with STWLC68JRH
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-I 2 C 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 I 2 C 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
UM2681 - Rev 1 - February 2020
For further information contact your local STMicroelectronics sales office.
www.st.com
1
UM2681
Board overview
Board 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-I 2 C 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 - Rev 1 page 2/18
2
UM2681
Board configuration and test points
Board 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-I 2 C converter to the host PC
• P2 connector/jumper: bridging point between the I
2
C bus (on-board converter) and the STWLC68JRH.
the connector turns into the I 2 C 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 - Rev 1 page 3/18
UM2681
Operating mode
3
Note:
Operating 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 I 2 C communication.
The jumpers at connector P2 must be closed as shown in Figure 3
to connect the STWLC68JRH to the USB-to-
I 2 C 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 I 2 C communication established.
The enable pin of the STWLC68JRH is held low by the USB-to-I 2 C converter resulting in reset state of
STWLC68JRH. By the opening the GUI, the USB-to-I 2 C 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 - Rev 1 page 4/18
UM2681 - Rev 1
Figure 4. Output and indication LED
UM2681
Operating mode
The STEVAL-ISB68RX has three additional LEDs dedicated to the USB-to-I 2 C converter: D8 LED indicates the correct initialization, D6 LED indicates I 2 C bus activity and D5 LED is the power-on indicator (USB supply rail).
Figure 5. Status LEDs page 5/18
4
UM2681
Default configuration of STWLC68JRH
Default 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 tradeoff 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, nonrepetitive 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 - Rev 1 page 6/18
UM2681
Graphical User Interface (GUI)
5
Note:
Graphical 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.
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.
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.
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 - Rev 1 page 7/18
Figure 7. Plotting key parameters via GUI
UM2681
Graphical User Interface (GUI)
UM2681 - Rev 1 page 8/18
6
UM2681
Baseline power profile (BPP) RX mode performance
Baseline power profile (BPP) RX mode performance
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 - Rev 1 page 9/18
UM2681
Schematic
7
Schematic
A
B
C
D
Coil
1
COIL
COIL
2
CPAR
3.9nF
CS1
100nF
CS2
100nF
CS3
100nF
CS4
100nF
CS5
TP2
Uni-Directional
D2
PGND
BOOT2
SMAJ22A
CBT2
47nF
CL2
CLAMP2
22nF
CM2
COMM2
22nF
TP3
Uni-Directional
D3
SMAJ22A
CBT1
BOOT1
47nF
CL1
CLAMP1
22nF
CM1
COMM1
22nF
PGND
3
Protections
Figure 9. Schematic of STEVAL-ISB68RX
4 5
Decoupling caps
6
Connectors
TP6
R1
91R
R2
91R
R3
91R
R15
0.47R
AGND
CR1
10uF
CR2
10uF
CR3
10uF
CR4
100nF
CO1
10uF
CO2
10uF
CO3
10uF
CO4
100nF
7
VOUT
Pull up resistors
VOUT
VRECT
PGND
VRECT
GND
3
4
1
2
1
Header 4
P3
1
P4
1
1
PGND
RESET
P5
8
7
6
5
4
3
2
1
12
11
10
9
Header 12
PGND
RSTB
V5V0
DFT
INTB
SDA
SCL
GPIO4
GPIO3
GPIO2
GPIO1
GPIO0
LED
8
VGATE
TP7
1
2
3
U4
D
D
G
STL7N6F7
D
D
S
6
5
4
AGND
GND GND
TP4
C3
1uF
C4
100nF
TP5
C5
4.7uF
C6
100nF
R4
4.7K
R5
4.7K
R17
4.7K
MCP_RSTB
1
G
R16
10K
R6
10K
RSTB
Q1
FDV303N
R7
100R
D1
LED0
B
A
STWLC68
AGND
DC mode
AGND
PGND
3.3V LDO
VBUS
C7
100nF
C2
1uF
1
3
U5
VIN
INHIBIT
LD2981
VOUT
NC
5
4
GND GND
GND
VDD
GND
C8
2.2uF
VRECT
VSSA
VSSA
CLAMP2
CLAMP1
VGATE
VOUT
VSSA
VSSA
VSSA
COMM2
COMM1
VOUT
VOUT
VOUT
VSSD
D5
D6
D7
D8
D1
D2
D3
D4
E1
E2
E3
E4
C3
C4
C5
C6
C7
C8
VRECT_S
VSSA
VSSA_S
NC
CLAMP2
CLAMP1
VGATE
VOUT
VSSA
VSSA
VSSA
NC
COMM2
COMM1
VOUT
VOUT
VOUT_S
VSSD
SDA
INTB
RSTB
BOOT_SEL
GPOI2
GPIO3
GPIO4
GPIO5
SCL
VSSD
VSSD
VSSD
VSSD
VSSD_S
GPIO0
GPIO1
V1V8
VSSA
J8
J7
J6
J5
J4
J3
J2
J1
H8
H7
H6
H5
H4
H3
H2
H1
G8
G7
U1
STWLC68
VSSD
VSSD
VSSD
VSSD
GPIO0
GPIO1
V1V8
VSSA
SDA
INTB
RSTB
BOOT_SEL
GPIO2
GPIO3
GPIO4
GPIO5
SCL
VSSD
R8
100K
DGND
STWLC68 is working without TX
J3
VOUT
D4
STPS1L60ZFY
VBUS
GND
AGNDPGNDDGND
1 2
CBT
4.7nF
V1V8 R10
1K
R11
NC
AGND
3 4
USB-I2C convertor
MCP_RSTB
MCP_INTB
RST
U2
3
4
1
2
GP0
GP1
RST
URx
MCP2221
C1
100nF
S1
SW-SPST
R13
470R
D5
LED
D8
LED
R14
220R
GND GND
5
GND
D+
D-
VUSB
SCL
12
11
10
9
MCP_SCL
MCP_SDA
D6
LED
I2C communication
1
2
3
U3
I/O1
GND
I/O2
USBLC6-2SC6
I/O1
VBUS
I/O2
C9
470nF
GND
GND
MCP_INTB
GND
P2
3
4
1
2
7
8
5
6
Header 4X2A
GND
INTB
SCL
SDA
6
5
4
GND
VBUS
C10
100pF
R9
1M
P1
1
2
3
4
5
VBUS
D-
D+
ID
GND
Shell
Shield
MicroUSB
GND GND
R12
220R
VDD
6
Title
STEVAL-ISB68RX
Number Size
A3
Date:
File:
20.1.2020
7
Sheet of
Drawn By:
Revision v2.0
8
C
D
UM2681 - Rev 1 page 10/18
8
UM2681
BOM
BOM
Table 1. Bill of material
Item Q.ty
1 10
Ref.
C1, C4,
C6, C7,
CO4,
CR4,
CS1,
CS2,
CS3,
CS4
2
3
6
6
CO1,
CO2,
CO3,
CR1,
CR2,
CR3
TP2,
TP3,
TP4,
TP5,
TP6, TP7
4
5
6
7
8
9
10
11
12
13
14
4
3
3
2
2
2
2
2
2
2
2
10%,
Value
100nF, 1005[0402], 50 VDC V,
10uF, 2012[0805], 35 VDC V, 10%,
TestPoint 1.5/0.8,
Description
Multilayer
Ceramic
Capacitors
MLCC -
SMD/SMT
Multilayer
Ceramic
Capacitors
MLCC -
SMD/SMT
Do not place
CL1,
CL2,
CM1,
CM2
R1, R2,
R3
22nF, 1005[0402], 50 VDC V, 10%,
91R, 2012[0805], 91 R V, 500 m
W, 5%,
Multilayer
Ceramic
Capacitors
MLCC -
SMD/SMT
Thick Film
Resistors -
SMD
R4, R5,
R17
4.7K, 1005[0402], Resistor
C2, C3
CBT1,
CBT2
D2, D3
GND,
VOUT
J3,
VRECT
P3, P4
R6, R16
1uF, 1005[0402], 25 VDC V, 10%,
47nF, 1005[0402], 50 VDC V, 10%,
Multilayer
Ceramic
Capacitors
MLCC -
SMD/SMT
Multilayer
Ceramic
Capacitors
MLCC -
SMD/SMT
DO-214AC (SMA), 22 VDC V,
HDR1X4,
ESD
Suppressors
Header 1x4 pin, 2.54mm
pitch
HDR1X2,
2mm_PIN,
R12, R14 220R, 1005[0402],
10K, 1005[0402],
Header 1x2 pin, 2.54mm
pitch
Do not place
Resistor
Resistor
Manufacturer
Murata
Murata
Murata
Panasonic
Murata
TDK
Part number
GCM155R71H104KE02D
GRM21BR6YA106KE43L
DNP
GRT155R71H223KE01D
P91ADCT-ND
Any
GRM155R61E105KA12D
C1005X7R1H473K050BB
SMAJ22A
Header, 4-Pin
Header, 2-Pin
DNP
Any
Any
UM2681 - Rev 1 page 11/18
UM2681 - Rev 1
UM2681
BOM
Item Q.ty
15 1 D5
Ref.
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
35
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
32 1
33 1
34 1
1
D6
D8
C10
C5
C8
C9
CBT
COIL
CPAR
CS5
D1
D4
P1
P2
P5
Q1
R10
R11
R13
R15
Value
Q_SMD_LED_0603_DIN1608M, 2
VDC V, 20 m A,
Q_SMD_LED_0603_DIN1608M, 2
VDC V, 20 m A,
Q_SMD_LED_0603_DIN1608M, 2
VDC V, 20 m A,
100pF, 1005[0402],
Description
RED LED
Manufacturer
Wurth Electronik
GREEN LED Wurth Electronik
YELLOW LED Wurth Electronik
4.7uF, 1005[0402], 10 VDC V,
20%,
2.2uF, 1005[0402], 6.3 VDC V,
20%,
470nF, 1005[0402], 16 VDC V,
10%,
4.7nF, 1005[0402], 50 VDC V,
10%,
8uH, HDR1X2,
3.9nF, 1005[0402], 50 VDC V,
10%,
DNP, 1005[0402],
Q_SMD_LED_0603_DIN1608M,
SOD-123, 60 VDC V, 1 A,
MICROUSB-629105150921,
HDR2X4_CEN,
HDR1X12,
G_SMD_SOT23_TO-236AB, 25
VDC V, Id 680 mA,
1K, 1005[0402],
DNP, 1005[0402],
470R, 1005[0402],
0.47R, 2012[0805], 250 mW,
Part number
150060RS55040
150060VS55040
150060YS55040
Multilayer
Ceramic
Capacitors
MLCC -
SMD/SMT
Coil
Multilayer
Ceramic
Capacitors
MLCC -
SMD/SMT
Do not place
RED LED
Schottky
Rectifiers
Fermale Micro
USB Type AB
Connectors
Header 2x4 pin, 2.54mm
pitch
Header 1x12 pin, 2.54mm
pitch
Capacitor
Multilayer
Ceramic
Capacitors
MLCC -
SMD/SMT
Multilayer
Ceramic
Capacitors
MLCC -
SMD/SMT
Multilayer
Ceramic
Capacitors
MLCC -
SMD/SMT
Murata
Murata
Murata
Murata
Murata
Wurth Electronik
Wurth Elektronik
MOSFET
ON
Semiconductors
Resistor
Do not place
Resistor
Current Sense
Resistors
Susumu
Any
GRM155R61A475MEAAD
GRM155R60J225ME95D
GRM155R61C474KE01D
GCM155R71H472KA37D
760308102207
GRM155R71H392KA01D
DNP
150060RS55040
STMicroelectronics STPS1L60ZFY
629105150921
Header, 4-Pin, Dual row
Header, 12-Pin
FDV303N
Any
DNP
Any
RL1220S-R47-F page 12/18
UM2681
BOM
Item Q.ty
36 1 R7
37 1
38 1
39
40
41
42
43
44
45
46
1
1
1
1
1
1
1
4
R8
R9
S1
U1
U2
U3
U4
Ref.
U5
Plastic case
Jumpers
Value
100R, 1005[0402],
100K, 1005[0402],
1M, 1005[0402],
SWITCH_P-DT2112C, 12 VDC V,
50 mA,
Description
Resistor
Resistor
Resistor
Tactile Switche
WLC68_72BUMPS,
QFN16,
SOT23-6L,
Wireless charging IC
USB Interface
IC
ESD
Suppressors
PowerFLAT, VDS 60 VDC V, Id 7
A,
SOT23-5L, 3.3 VDC Output V, 100 mA Output A,
MOSFET
LDO Voltage
Regulators
Manufacturer
Microchip
Any
Any
Any
Part number
P-DT2112C
STMicroelectronics STWLC68
MCP2221A-I/ML
STMicroelectronics USBLC6-2SC6
STMicroelectronics STL7N6F7
STMicroelectronics LD2981CM33TR
Sullins Connector
Solutions
QPC02SXGN-RC
UM2681 - Rev 1 page 13/18
Revision history
Date
20-Feb-2020
Version
1
Table 2. Document revision history
Changes
Initial release.
UM2681
UM2681 - Rev 1 page 14/18
UM2681
Contents
Contents
UM2681 - Rev 1 page 15/18
UM2681
List of tables
List of tables
UM2681 - Rev 1 page 16/18
UM2681
List of figures
List of figures
UM2681 - Rev 1 page 17/18
UM2681
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. For additional information about ST trademarks, please refer to www.st.com/trademarks . 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.
© 2020 STMicroelectronics – All rights reserved
UM2681 - Rev 1 page 18/18
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