The STWBC digital controller for wireless battery charger (WBC) transmitters from STMicroelectronics is designed for controlling power transfer from a WBC transmitter (TX) to a receiver (RX) in WBC-enabled phones, wearables, and other battery-powered devices that use electromagnetic induction for re-charge.
STWBC digital controller from ST are compatible with Qi Wireless Power Consortium and the PMA (Power Matters Alliance). ST says it is one of the first companies that hold certification for the newest Qi 1.1.2 A11 standard.
The STWBC offers digital feedback between TX and RX units also allows the detection of metal objects close to the receiver (foreign object detection FOD) that could result in potential hazards, enabling the STWBC to stop power transmission when such objects are detected.
Key features of the STWBC include:
Multiple Qi and PMA standards support
Qi 1.1.2 A11-certified
Up to 5W power capability for mobiles, wearables, remote controls
Native support for half-bridge and full-bridge topologies
5V operating voltage.
STWBC is provided with firmware options to offer customers the ability to personalize their end product without the need of external microcontrollers:
A turn-key Qi 1.1.2 A11 certified solution (reference design board STEVAL-ISB027V1), fully interoperable with Qi-enabled mobile phones
API (application programming interface) access to customize the underlying firmware, for example modifying the behavior of the LEDs or GPIOs in response to the receiver behavior and supporting I²C and UART communication within a network.
The device is offered together with a complete ecosystem to support customers in building their applications, including the Qi 1.1.2 A11-certified reference design board (STEVAL-ISB027V1), API libraries and documentation to develop software customizations, as well as a comprehensive graphical user interface to monitor real-time performance and diagnostics.
Housed in a VFQFPN32 package, the STWBC is available in full production at a price of US$3.00 in 1k volumes.