Galvanic Skin Resistance (GSR) and Body Composition (BCM) measurements provide valuable biometric information that can be used in inferring emotional state and calculating body fat mass, respectively.
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.
- GSR Mode
- Skin conductance as a function of time
- Infer stress condition
- BCM Mode
- Body impedance (magnitude & phase) as a function of time, or frequency sweep
- Body Fat Mass
- Body Mass Index
- Measures body temperature
- Mobile access via iOS and Android apps
- 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
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Disclaimer: THIS MATERIAL IS PROVIDED “AS-IS” FOR EVALUATION PURPOSES ONLY. RENESAS ELECTRONICS CORPORATION AND ITS SUBSIDIARIES (collectively, “Renesas”) DISCLAIM ALL WARRANTIES, INCLUDING WITHOUT LIMITATION, FITNESS FOR A PARTICULAR PURPOSE AND MERCHANTABILITY. Renesas provides evaluation platforms and design proposals to help our customers to develop products. However, factors beyond Renesas' control, including without limitation, component variations, temperature changes and PCB layout, could significantly affect the product performance. It is the user’s responsibility to verify the actual circuit performance.