STMicroelectronics released a new plug-and-play wireless battery charger development kit STEVAL-ISB045V1 for small IoT devices and wearables to quickly build ultra-compact chargers up to 2.5W with a space-saving 20mm-diameter coil.
The development kit is built around the STWBC-WA wireless charging-transmitter controller and also includes a charging base unit containing a transmitter board with the 20mm coil already connected and ready to use. It uses the PC-based STSW-STWBCGUI software which allows configuring the STWBC-WA and monitoring runtime information such as power delivered, bridge frequency, demodulation quality, and protocol status. The kit includes a dongle for running the GUI.
The STMicroelectronics supporting ecosystem which includes certified reference boards, software, and detailed documentation, helps developers quickly deliver the smallest and best-performing chargers into fast-growing new markets for smart objects and wearables.
The STWBC-WA controller chip contains integrated drivers and natively supports full-bridge or half-bridge topologies for powering the antenna. The half-bridge option allows charging up to 1W with a smaller-diameter coil for an even more compact form factor. Moreover, the chip supports all standard wireless-charging features, including Foreign Object Detection (FOD) and active presence detection for safe charging, and also uses digital feedback to adapt the transmitted power for optimum efficiency at all load conditions. Two firmware options give users the choice of a fast turnkey solution or customizing the application using APIs to access on-chip peripherals including an ADC, a UART, and GPIOs.
The STEVAL-ISB045V1 kit is available now for $42. STWBC-WA transmitter controller ICs are in production, priced from $2.82 in VFQFPN32 package for orders of 1000 pieces.
