November 2016

DocID029584 Rev 3

1/9

For further information contact your local STMicroelectronics sales

office

www.st.com

STEVAL-ISB038V1

1 W wearable wireless power system based on STWBC-WA and

STWLC04

Data brief

Features

•

Wearable 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

•

STWBC-WA Wireless power transmitter:

−

Cost effective Half Bridge topology with

integrated drivers

−

Optional Full Bridge configuration for 3

W applications

−

Active presence detector

−

2-layer PCB to facilitate design

−

Turnkey solution or customizable via

APIs

−

Parametric customization via Graphical

interface

•

STWLC04 wireless power receiver:

−

Output voltage: 5 V regulated voltage

−

Integrated high efficiency synchronous

rectifier

−

Li-Ion/Li-Pol charger functionality

−

4-layer PCB to facilitate design

Description

The STEVAL-ISB038V1 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 1-watt wireless power

transfer with a half-bridge 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 full-bridge configuration on the transmitter.

The STWBC-WA transmitter can support a cost-

effective half-bridge topology (full-bridge 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 on-chip I²C and

UART ports.

The STWLC04 is designed for 1-watt 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 non-volatile memory.