Renesas has developed a reference design/solution that can be used by our customers as a starting point for wearable galvanic skin response products and hand held body composition meter systems. This battery powered device takes DC conductance measurements in GSR mode and high-precision AC impedance measurements in BCM mode, while consuming minimal power.

The resolution and the speed of the analog-to-digital converters is critical for the accuracy of GSR-BCM measurements along with skin temperature compensation. Given that these measurements are mostly used in portable or wearable products, they offer energy efficiency and wireless connectivity. The GSR-BCM solution leverages the Renesas Synergy™ S1JA MCU for its high-performance analog and low power capabilities. It also highlights the RL78/G1D for Bluetooth connectivity and the ISL9203A for Li-Ion battery charging.


  • Small Form Factor
  • Fuel Gauge
  • USB Charging
  • Bluetooth Low Energy (BLE)
  • Temperature Sensor
  • DC Conductance Measurements in GSR Mode
  • High-precision AC Impedance Measurements in BCM Mode
  • Power Switch and LED