Wireless charging solution for wearable devices based on ST STWBC-WA digital controller

► Scenario application diagram

► Product entity diagram

► Showcase photos

► Scheme block diagram

► Core technical advantages

• Ultra-compact coil with a diameter of 20 mm

• Make the transmission power according to the actual load conditions and digital feedback sending device to improve efficiency

•Foreign body (FOD) and active presence detection function; stop power transmission when metal or magnetic objects are detected in the charging area to increase safety

• Flexible setting and adjusting coil, supporting low power consumption applications from 1 to 2.5 W

• Graphical interface system behavior monitoring

• Complete reference design (IC, firmware, GUI and interface tools)

•Certified

► Solution specifications

VIN range: 3 V to 5.5 V

– Supports USB VIN

• Active presence detector

• Parametric customization via graphicalinterface

• 2 firmware options:

– Turnkey solution for quick design

– APIs available for application customization

• Peripherals available via APIs

– ADC, with 10-bit precision

– UART

– I2C master fast/slow speed rate

– GPIOs: Flash and EEPROM with read-while-write (RWW) and Error Correction Code (ECC)

– Program memory: 32 Kbytes Flash; data retention: 15 years at 85 °C after 10 kcycles at 25 °C

– Data memory: 1 Kbyte true data EEPROM; data retention: 15 years at 85 °C after 100 kcycles at 85 °C

– RAM: 6 Kbytes

– Operating temperature: -40 °C up to 105 °C