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New High-Resolution Digital Biosensor for Wearable Applications

The Optoelectronics group of Vishay Intertechnology introduces a new fully integrated proximity and ambient light sensor optimized for heart rate and pulse oximetry measurements in wearable devices. The Vishay Semiconductors VCNL4020C combines an IR emitter, broad sensitivity photo diode and ambient light photo diode, a signal processing IC, and a 16-bit ADC in a compact 4.9 mm by 2.4 mm by 0.83 mm surface-mount package. The new biosensor features an interrupt function and supports I2C bus communication interface.

  • Greatly simplifies window and sensor placement
  • Small outline and low height save space in compact end products
  • Can be used with Vishay’s VLMTG1300 high-power green LED in a low-profile package for heart rate measurements
  • Can be used with Vishay’s VSMD66694 dual LED with balanced radiant power at RED and IR wavelengths for pulse oximetry applications
  • Provides flexibility in device placement
  • Product Benefits:

  • Ambient light spectral sensitivity close to that of the human eye
  • Combines an IR emitter, proximity photo-diode, and an ambient light sensor
  • Supports an external LED connection
  • Integrated signal processing IC and 16-bit ADC 
  • Compact 4.9 mm by 2.4 mm by 0.83 mm rectangular leadless (LLP) package 
  • Supports I²C bus communication interface
  • Ambient light function: 
  • Detection from 0.25 lx to 16.3 klx 
  • 100 Hz and 120 Hz flicker noise rejection 
  • Proximity function: 
  • Excellent cross-talk immunity 
  • Programmable LED drive current from 10 mA to 200 mA in 10 mA steps 
  • Excellent ambient light suppression by signal modulation 
  • Supply voltage range of 2.5 V to 3.6 V  LED_Anode voltage range of 2.5 V to 5 V 
  • I²C bus voltage range from 1.7 V to 5 V  Low stand-by current consumption of 1.5 μA 
  • Moisture sensitivity level (MSL) of 4, in accordance with J-STD-020 
  • RoHS-compliant, halogen-free, Vishay Green
  • Market Applications:

    Wearables 

    Health monitoring 

    Heart rate and pulse oximetry measurements

    Availability: Samples and production quantities of the VCNL4020C are available now, with lead times of eight to 12 weeks for larger orders.

    To access the product datasheets on the Vishay Website, go to http://www.vishay.com/doc?84350 (VCNL4020C)

    Press Release

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