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Ultra-Low Power Wearable Devices with Bluetooth Low Energy 5.1

Wearable devices, such as smart watches, are getting smarter and more power hungry. With the combination of the world’s smallest and lowest power Bluetooth® 5.1 system-on-chip (SoC), the DA14531 SmartBond TINY™ Module and the ultra-low power RE01 CPU, Renesas provides a solution that is suitable for battery powered wearable devices. Since the battery size of wearable devices is generally quite small (i.e., 120mAh), in this reference design the RE01 MCU's processing current can be reduced by half by using external ISL9123 buck regulators, enabling extended battery life. 

System Benefits

  • The DA14531 SmartBond TINY™ Module, based on the world’s smallest and lowest power Bluetooth 5.1 SoC, brings the DA14531 SoC advantages to an integrated module. DA14531 is certified across regions, providing significant savings in development cost and time-to-market. 
  • RE01 Arm® Cortex®-M0+ ultra-low power MCU based on Renesas' Silicon on Thin Buried Oxide (SOTB™) process technology. 
  • The ISL9123 ultra-low IQ buck regulator enables extended battery life in wearable devices, which require very loaded CPU processing for features such as voice recognition . 
  • DA9072 highly integrated PMIC for wearables. 
  • High-precision sensors, a pulse oximeter sensor and a humidity/temperature sensor support high-performance sensing functions. 

Target Applications

  • Battery-powered voice command systems 
  • Smart watches 
  • Wearable healthcare applications 
  • Battery-powered portable devices 

Ultra-Low Power Wearable Devices with Bluetooth Low Energy 5.1

Renesas Dialog Diagram Legend
Biosensor      
OB1203 Heart Rate, Blood Oxygen Concentration, Pulse Oximetry, Proximity, Light and Color Sensor Datasheet Buy/Sample

 

Buck Regulator      
ISL9123 Ultra-Low IQ Buck Regulator with Bypass Datasheet Buy/Sample

 

Connectivity      
DA14531 World’s Smallest and Lowest Power Bluetooth 5.1 System-on-Chip Datasheet Buy/Sample

 

Humidity Sensor      
HS3001 Relative Humidity and Temperature Sensor Datasheet Buy/Sample

 

MCU      
RE01 Arm Cortex-M0+ Ultra-Low Power MCU Based on SOTB Process Technology Datasheet Buy/Sample

 

Operational Amplifier      
READ2304GSN High Drivability and High Slew Rate, Input Output Full Range, CMOS Dual Operational Amplifier, VIO ≤±6mV, SR = 8V/μs, GBW = 6MHz Datasheet Buy/Sample

 

Power Management IC (PMIC)      
DA9072 PMIC for low power portable applications Datasheet Contact sales