ST STEVAL-ISB68WA Manuel utilisateur

Introduction

The STEVAL-ISB68WA is an evaluation kit based on STWLC68JRH wireless power receiver and it is designed as reference

solution for wearable applications. The kit consists of a wireless receiver module and USB-to-I2C bridging dongle. The receiver

is a 3-elements stack: a PCB housing the STWLC68JRH wireless power receiver and all the required external components, a 2

mm thick plastic spacer and a 15 mm diameter receiving coil facing the bottom side.

Figure 1. Receiver module

The module is configured to provide a constant 5 V output voltage with a maximum power capability of 2.5 W and it works out of

the box when placed on a suitable wireless power transmitter.An on-board LED indicates when the communication with the

transmitter succeeds and the power transfer is in progress.Thanks to the I2C interface, the module can be easily controlled and

configured through the dedicated Graphical User Interface (GUI) by using the enclosed USB-to-I2C dongle.

The complete reference application is confined in a 10x10 mm area of the PCB and all the components are intentionally spaced

to ease probing and customization to the end user.

Getting started with STEVAL-ISB68WA wireless power receiver evaluation kit for

wearable applications

UM2693

User manual

UM2693 - Rev 1 - February 2020

For further information contact your local STMicroelectronics sales office.

www.st.com

1Wireless power receiver module

Overview

As visible in Figure 2, the schematic diagram of the wireless power receiver is relatively simple. The RX coil (J1-

J2 terminal) is part of the series resonant circuit (C1 through C4 capacitors) that provides the AC voltage to the

AC1-AC2 pins of the STWLC68JRH. The rectified voltage is filtered by C15 through C17 capacitors and

accessible at J3 connector, mainly used to monitor the ping-up behavior and the ASK modulation. The output rail

(VOUT pins) is filtered by C18 through C20 capacitors and made available at J5 terminal. Few additional

components are needed to complete the wireless receiver: bootstrap capacitors for the rectifier (C8 & C11) and

for the main linear regulator (C12), modulation capacitors (C6, C7, C9 and C10) and filtering capacitors for the 1.8

V and 5 V supply rails (C13 & C14). The R1 resistor is connected between VRECT and IEXT to implement an

active clamper to prevent excessive voltages (Over-Voltage Protection). Transient voltage Suppressors (D1 & D2)

are recommended to protect the application against ESD.

Figure 2. Receiver module schematic

UM2693

Wireless power receiver module

UM2693 - Rev 1 page 2/18

The terminals for the receiving coil, the output load and the control signals are summarized in Table 1. The output

rail and the control interface are already made easily accessible by means of wires terminated with pin header

female connectors (Figure 4).

Table 1. Receiver module terminals

Terminal Signal Wiring color

J1 AC input (RX coil) -

J2 AC input (RX coil) -

J3 VRECT (rectifier output) -

J4 Power return (ground) Black (P1)

J5 VOUT power output Red (P1)

J6 INT (digital output) Orange (P2)

J7 SCL (digital input) Yellow (P2)

J8 SDA (digital I/O) Green (P2)

J9 Signal ground Blue (P2)

Figure 3. Receiver module top and bottom silkscreen

UM2693

Wireless power receiver module

UM2693 - Rev 1 page 3/18

Figure 4. Receiver module wiring

Additional control signals and programmable general-purpose I/O pins are available at the STWLC68JRH, but

they are not used in the module to keep the reference solution as simple as possible. The STWLC68JRH chip can

handle up to 400 kHz speed over the I2C bus. Table 2 summarizes the default STWLC68JRH settings that are

retrieved from OTP memory at power-up. Values eventually changed via I2C registers are lost if the receiver

module is removed from the transmitter, unless VOUT or VRECT rails are externally kept above 4V (e.g. as per

Figure 7b).

Table 2. Receiver module default settings

Parameter Default setting

Output voltage 5.0 V

Minimum VRECT 4 V (output is disconnected if VRECT voltage is lower than this value)

Dummy load 40 mA (minimum load current to ensure ASK communication stability)

Nominal chip idle current consumption 17 mA (application dependent)

Output current threshold for deeper ASK

modulation

100 mA (if the output current is higher than this value, auxiliary

modulation pins CLAMP1 and CLAMP2 are activated)

GPIO0 pin function Open drain, low when output is enabled (D3 LED)

INT pin function Open-drain, low in case of over-temperature, over-current or over-

voltage condition.

Over-Temperature protection

Lower 80°C threshold leading to output disconnection and EPT

generation to terminate power transfer. Upper 125°C threshold leading to

AC1 and AC2 pins short-to-ground.

Over-Voltage protection (VRECT rail)

Lower 12 V threshold leading to temporary IEXT activation (VRECT

clamping). Upper 25 V threshold leading to AC1 and AC2 pins short-to-

ground.

Over-Current protection 1.5 A threshold leading to output disconnection and EPT generation to

terminate the power transfer.

UM2693

Wireless power receiver module

UM2693 - Rev 1 page 4/18

As already mentioned, a LED (D3) is connected to GPIO0 and it is used as output state monitor: it turns-on when

a correct power transfer is established between the receiving module and the transmitter, and the output voltage

is enabled. All the settings shown in table 2 (and other additional ones) can be modified in the registers page of

the GUI (see the related GUI user manual for details).

Table 3. Receiver module bill of material

Component Value Description Part Number Manufacturer

L1 11.8µH RX coil, 15 mm 760308101219 Wurth

C1, C2, C3 47nF ±10%

MLCC, X7R, 50V,

0402

GRM155R71H473KE14D

Murata

C4 100nF ±10% GCM155R71H104KE02D

C5 1.8nF ±5% GRM155R71H182JA01D

C7, C8, C10, C11 47nF ±10% GRM155R71H473KE14D

C12 4n7 ±10% GCM155R71H472KA37D

C6, C9 22nF ±10% GRM155R71H223KA12D

C13, C14 2.2µF ±10% MLCC, X5R, 25V,

0402 GRM155R61E225KE11D Murata

C15, C16, C17, C18,

C19, C20 10µF ±20% MLCC, X5R, 25V,

0603 GRM188R61E106MA73D Murata

D1, D2 12V Uni-directional TVS,

SOD882 PESD12VS1UL NXP

D3 Red LED, 0402 SML-P12VTT86R Rohm

R1 100R ±5% Anti-surge resistor,

0.25 W, 0603 CRGP0603F100R TE Connectivity

R2 470R ±5%

Resistor, 0.1 W, 0201

R3, R4, R5 47k ±5%

U1 Wireless power

receiver, CSP-72 STWLC68JRH STMicroelectronics

UM2693

Wireless power receiver module

UM2693 - Rev 1 page 5/18

2USB to I2C bridging dongle

Overview

The USB to I2C bridging dongle is the tool that allows interfacing the receiver to the Graphical User Interface

running on a PC. The P2 connector signals are summarized in Table 4. Three LEDs monitor the operation of the

bridge: D1 (green) indicates I2C bus activity, D2 (red) indicates correct initialization of the U1 chip and D3 (yellow)

is a power-on indicator. When the dongle is plugged into the USB port, both D2 and D3 should be on.

Figure 5. USB-to-I2C bridging dongle top view

Figure 6. USB-to-I2C bridging dongle schematic

D D

C C

B B

A A

Title

Number RevisionSize

Date: 14.2.2020 Sheet of

File: C:\Projects\..\STEVAL-ISB68I2C.SchDoc Drawn By:

I2C communication

GND

470nF

GND

100nF

GND GND GND

MCP_RSTB

MCP_INTB I/O1

GND

I/O2

3I/O2 4

VBUS 5

I/O1 6

USBCL6-2

GP0

GP1

RST

URx

UTx

GP2

GP3

SDA

SCL 9

VUSB 10

D- 11

D+ 12

VSS 13

NC 14

NC 15

VDD 16

MCP2221

RST

VBUS

D-

D+

GND

Shield

Shell

MicroUSB

VBUS

VDD

GND

100nF

2.2uF

GND GND

VBUS

1uF

GND

VDD

VIN

INHIBIT

3NC 4

VOUT 5

GND

LD2981

220R

LED

VDD

LED

220R

LED

470R

GND

VBUS

SW-SPST

100nF

RST

GND

GP2

GP3

GP2

GP3

SDA

SCL

4k7

VDD

SDA

SCL

Header connector

GND

SDA

SCL

MCP_INTB

RSTB

VBUS

4k7

VDDMCP_INTB

STPS1L60ZFY

Littelfuse 0603L025

S D 32

FDV303N

GND

RSTB

MCP_RSTB

100k

4k7

VDD

STEVAL-USBI2C

Table 4. USB-to-I2C bridging dongle P2 connector

Pin Signal Description

1 GND Common return (ground)

2 SDA I2C bus, SDA line

3 SCL I2C bus, SCL line

4 INTB I/O line dedicated to INT pin management (status reading)

5 RSTB Reset signal for the STWLC68JRH chip, active low. Not used in the receiver

module.

UM2693

USB to I2C bridging dongle

UM2693 - Rev 1 page 6/18

Pin Signal Description

6 VBUS

Auxiliary supply rail. Used to supply the STWLC68JRH chip via VOUT when

the receiver module is not placed on a transmitter. The D4 diode (see

Figure 6) avoids backflow toward the USB supply rail when VOUT is higher

than 5V.

The receiver module must be connected to the dongle as shown in Figure 7a: the P2 connector of the receiver

engages with the corresponding 4 signals of the P2 connector of the dongle. The communication over the I2C bus

is possible only if the STWLC68JRH chip of the receiver is powered: when not placed on a transmitter, the

receiver module can be powered through VOUT by wiring it to the VBUS pin of P2 (Figure 7b). This way of

powering the receiver module is also required during OTP memory flashing.

Figure 7. Connection between receiver module and dongle

Table 5. USB-to-I2C bridging dongle bill of material

Component Value Description Part Number Manufacturer

C1, C5, C6 100nF ±10% MLCC, X7R, 50V,

0402 GCM155R71H104KE02D Murata

C2 1uF ±10% MLCC, X7R, 25V,

0402 GRM155R61E105KA12D Murata

C3 2.2uF ±20% MLCC, X7R, 6.3V,

0402 GRM155R60J225ME95D Murata

C4 470nF ±10% MLCC, X7R, 16V,

0402 GRM155R61C474KE01D Murata

D1 Red LED, 0603 150060VS55040 Wurth Elektronik

D2 Green LED, 0603 150060RS55040 Wurth Elektronik

D3 Yellow LED, 0603 150060YS55040 Wurth Elektronik

D4 Schottky diode, 60V,

1A, SOD123 STPS1L60ZFY STMicroelectronics

R1 1M ±5%

Resistor, 0.1W, 0402

R2, R3, R4, R9 4k7 ±5%

R5 470R ±5%

R6, R7 220R ±5%

R8 100k ±5%

Q1 N-channel MOSFET,

25V, 0.6A, SOT23 FDV303N ON-Semi

UM2693

USB to I2C bridging dongle

UM2693 - Rev 1 page 7/18

Component Value Description Part Number Manufacturer

P2 Pin header, 2.54 mm

pitch

U2 3.3V, 100 mA, Linear

regulator, SOT23-5L LD2981CM33TR STMicroelectronics

F1 Fuse, 0.25A, 0603 0603L025 Littelfuse

U1 USB to I2C

converter, QFN16 MCP2221A-I/ML Microchip

Linear regulator,

3.3V, 100 mA,

SOT23-5L

LD2981CM33TR STMicroelectronics

U3 ESD suppressor,

SOT23 USBCL6-2SC6 STMicroelectronics

P1 Micro-USB connector 629105150921 Wurth Elektronik

S1 SMT tactile switch,

6mm x3.5 mm P-DT2112C Diptronic

UM2693

USB to I2C bridging dongle

UM2693 - Rev 1 page 8/18

3STEVAL-ISB68WA test setup

The evaluation of the STEVAL-ISB68WA kit relies on a suitable wireless power transmitter that could mate with

the coil of the RX module. A good coupling factor is essential for both power transfer efficiency and data

communication reliability between the transmitter and the receiver.

The STEVAL-ISB045V1 wireless power transmitter evaluation kit contains the reference transmitter for the test

setup. The complete test setup is shown in Figure 8.

Figure 8. STEVAL-ISB68WA evaluation setup

The receiver is connected to the dongle as per Figure 7a and placed on the transmitter.

Note: The transmitter must be configured (through its own GUI) to have a ping frequency of 120 kHz and a 130 kHz

-170 kHz operating frequency range. These parameters are easily unlocked and configured in the “parameters”

window (Figure 9).

UM2693

STEVAL-ISB68WA test setup

UM2693 - Rev 1 page 9/18

Figure 9. Configuration of the transmitter

As soon as the LED on the receiver lights up, its control GUI can be launched. Connectivity with the

STWLC68JRH is automatically verified and the chip info (IDs content) is shown in the registers page (Figure 10).

UM2693

STEVAL-ISB68WA test setup

UM2693 - Rev 1 page 10/18

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