Wireless-Charging Kit Creates Ultra-Compact Chargers

STMicroelectronics’ STEVAL-ISB045V1plug-and-play wireless battery-charger development kit lets users quickly build ultra-compact chargers up to 2.5W with a 20-mm coil, for charging small IoT devices and wearables such as smart watches, sports gear, or healthcare equipment. Built on the STWBC-WA wireless charging-transmitter controller, the kit comprises a charging base unit containing a transmitter board with the 20-mm coil already connected and ready to use. The kit includes PC-based STSW-STWBCGUI software to configure the STWBC-WA and monitor runtime information such as power delivered, bridge frequency, demodulation quality, and protocol status. It also includes a dongle for running the GUI.

 

The supporting ecosystem includes certified reference boards, software, and detailed documentation to help developers quickly deliver the smallest and best-performing chargers into fast-growing new markets for smart objects and wearables.

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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. The chip supports all standard wireless-charging features, including Foreign Object Detection (FOD) and active presence detection for safe charging, and 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 in VFQFPN32 packages, priced from $2.82 each/1,000. Learn more by perusing the STEVAL-ISB045V1 datasheet and the STWBC-WA transmitter controller datasheet.

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