Digital controller for wireless battery charger transmitters for wearable and smartwatch applications
【產品特性】 Digital controller for wireless battery charger transmitters
Optimized for < 3 W applications
– Smartwatches and healthcare
– Internet of Things (IoT) battery-powered smart devices
– Remote controllers
Cost effective half-bridge topology with integrated drivers
Optional full-bridge configuration for 3 W applications
VIN range: 3 V to 5.5 V
– Supports USB VIN
Active presence detector
Parametric customization via graphical interface
2 firmware options:
– Turnkey solution for quick design
– APIs available for application customization
Peripherals available via APIs
– ADC, with 10-bit precision
I2C master fast/slow speed rate
【文字介紹】The STWBC-WA is STMicroelectronics’ wireless battery charger transmitter application
optimized for wearable usage.
Thanks to its 5 V native supply, the STWBC-WA device is ideal to operate with USB power
Wireless battery charging systems replace the traditional power supply cable by means of
electromagnetic induction between a transmitting pad or dongle (TX) and a battery-powered
unit (RX), such as a smartwatch or sports gear.
The power transmitter unit is responsible for controlling the transmitting coil and generating
the correct amount of power requested by the receiver unit. The receiver unit continuously
provides the transmitter the correct power level requested, by modulating the transmitter
carrier through controlled resistive or capacitive insertion. Generating the correct amount of
power guarantees the highest level of end-to-end efficiency due to reduced energy waste. It
also helps to maintain a lower operational temperature.
The digital wireless battery transmitter can adapt to the amount of energy transferred by the
coil by modulating the frequency, duty cycles or coil input voltage.