BH1792GLC Optical Sensor for Heart Rate Monitoring

By ROHM Semiconductor 151

BH1792GLC Optical Sensor for Heart Rate Monitoring

ROHM's BH1792GLC is an optical sensor for heart rate monitoring that includes photodetectors and drivers to power green and IR LEDs. Heart rate is calculated by detecting the amount of green light that is reflected from the body. LED brightness can be adjusted via the LED driver current. The built-in photodiode has high sensitivity to green light, and excellent wavelength selectivity enables accurate pulse wave detection.

  • VCC voltage range: 2.5 V to 3.6 V
  • Current consumption: 200 µA (typ.) [LED OFF]
  • Standby mode current: 0.8 µA (typ.)
  • Selectable LED output current: 1 mA to 63 mA @ 1 mA steps
  • Selectable measurement mode: 32 Hz/64 Hz/128 Hz/256 Hz/1024 Hz
  • Operating temperature range: -20°C to +85°C
  • Package: WLGA010V28 (2.8 mm x 2.8 mm x 1.0 mm)
  • Built-in green photodiode with excellent green bandpass and IR cut filters
  • Integrated IR photodiode detects proximity
  • High sampling frequency: 1024 Hz
  • Current selectable LED driver
  • I²C bus interface (f/s mode support)
  • Built-in FIFO reduces host power consumption
  • Wearables
  • Smartphones
  • Tablets
  • Devices requiring vital sign sensing

BH1792GLC Block Diagram