Wearable devices, such as smart watches, are getting smarter and more power hungry. This is because more CPU processing is required for digital signal processing, such as for voice recognition. It causes an increase in the current consumed by even our ultra-low power RE01 CPU, affecting the battery life. Since the battery size of wearable devices is generally quite small (i.e., 120mAh), 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, directly contributing to an extended battery life.
- The ultra-low ISL9123 buck regulator enables extended battery life in wearable devices, which require very loaded 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
Energy Harvesting Microcontroller
|RE01||Microcontroller based on Silicon on Thin Buried Oxide (SOTB™) process technology||Datasheet||Select Specific Device|
|RL78/G1D||Bluetooth® Low Energy microcontrollers for smart connectivity||Datasheet||Select Specific Device|
Li-ion Battery Charger
|ISL9205||Single-cell Li-ion/Li-polymer battery charger||Datasheet||Buy/Sample|
|ISL9123||Ultra-low IQ buck regulator with bypass||Datasheet||Buy/Sample|
|ISL88002||Ultra-low power 3Ld voltage supervisors in SC-70 and SOT-23 packages||Datasheet||Buy/Sample|
|READ2302||High drivability and high slew rate, input/output full range, CMOS dual operational amplifier VIO ≤ ±6mV, SR = 8V/μs, GBW = 6MHz||Datasheet||Buy/Sample|
|HS3001||High-performance relative humidity and temperature sensor||Datasheet||Buy/Sample|
|ISL29125||Digital red, green and blue color light sensor with IR blocking filter||Datasheet||Buy/Sample|
Renesas’ complementary product portfolios of Analog + Power + Embedded Processing work together to deliver comprehensive solutions to our customers. Our product experts have developed "Winning Combinations," compelling product combinations that help our customers accelerate their designs and get to market faster.