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Wearable Devices with RE01

Author: EIS Release Date: Mar 8, 2021

Renesas' reference design for wearable devices can reduce processing by half for extended battery life

Image of Renesas' Wearable Devices with RE01 Wearable devices are getting smarter and more power-hungry due to the requirement of more CPU processing for digital signal processing such as voice recognition. The added signal processing causes an increase in the current consumed by even Renesas' ultra-low power RE01 CPU affecting the battery life. Since the battery size of wearable devices is generally quite small (i.e., 120 mAh), this winning combo reference design replaces the RE01 MCU's internal LDOs with external ISL9123 buck regulators. With this reference design, the RE01 CPU processing current can be reduced by half and directly contributes to extended battery life.

Features

Image of Renesas' Wearable Devices with RE01 Features list

System Benefits
  • The ultra-low IQ ISL9123 buck regulator enables extended battery life of wearable devices that require very heavy CPU processing for features such as voice recognition
  • ISL29125 light sensor controls the brightness of the backlight
  • The READ2302 op amp amplitudes the output of the MEMS microphone to detect the voice from the RE01 14-bit ADC
  • The ISL9205 battery charger charges the Li-ion battery
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