Chipscale wireless charging chipset includes foreign object detection

Chipscale wireless charging chipset includes foreign object detection

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By Nick Flaherty

STMicroelectronics has launched a 5W integrated chipset for wireless charging of systems in chipscale packaging for wearable designs

The STWLC68 includes a high-power receiver and a transmitter with power sharing with FOD (Foreign Object Detection) and other ST-proprietary safety IPs and is WPC Qi 1.2.4 compliant, making it compatible with all Qi certified devices in the market. The design includes a 32bit, 74MHz ARM Cortex microcontroller core with specific on-chip thermal management and over-voltage and over-current protection.

The chipset includes a fully integrated low-impedance, high-voltage 27V synchronous rectifier and low drop-out linear regulator giving a typical system efficiency of 80 percent. The output voltage ranges from 3.6 V to 20 V programmable output voltage with 25 mV resolution. It integrates an 8-channel, 10bit A/D Converter and six configurable GPIOs.

A 400kHz I2C interface allows firmware and platform parameters to be customized in the device and the configuration can be programmed into the embedded OTP. Additional firmware patching improves the IC’s application flexibility.

Two evaluation-board types, STEVAL-ISB68RX and STEVAL-ISB68WA, are available to simplify prototyping with the STWLC68JRH for both standard 5W applications or PCBA-sensitive 2.5W low-power applications, respectively. The evaluation kits are easy to use, with header connectors for easy access to the GPIOs and other important signals. A USB dongle is included for configuring the device registers.

The STWLC68JRH is available in a 3.29mm x 3.7mm x 0.6mm WLCPS 72-bumps 0.4mm pitch package and priced from $2.0 for orders of 10,000 pieces.

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