Feature
- Reflective or Transmissive Heart Rate, Heart Rate Variability, or SpO2 Monitoring
- Transmit Section
- Two 8-bit LED Current DACs
- Four Current Ranges 50mA, 100mA, 150mA, 200mA
- Low Noise Current Sources for High Peak Transmit to Receive Dynamic Range
- Low 160mV Dropout to Support Direct Drive From Rechargeable Li Battery
- High Output Impedance and High Supply Rejection to Support Unregulated Supply or Direct Drive From Boost Switcher Supply
- Receive Section
- 19-bit Optical ADC Path to Support the Lowest Perfusions Situations
- Low 25pA-RMS Input Referred Noise to Minimize LED Power Under Most Conditions
- High Ambient Light Input Range of 200μA and to Support Extraction of HRM Signal in the Most Adverse Lighting Conditions
- Built-in Front And Back-End Ambient Light Cancellation, Improving Rejection and Eliminating System Complexity of Dealing with Ambient Light
- Short Exposure Pulse Widths of 52μs, 104μs, 206μs, 417μs for Efficient Uses of LED Light
- Multiple Sample Rate Options from 20sps to 3.2ksps
- Ultra-Low-Power Operation for Mobile and Body-Wearable Device
- Dynamic Power-Down Modes to 100sps for Low-Power Consumption
- Full AFE Power Consumption of Less Than 25μA (Typ) at 25sps
- Large 32 Sample FIFO to Support Batch Processing in the Microcontroller
- Variety of System Monitors Mappable to Interrupts to Off-Load System Monitoring Functions From the Microcontroller
- Low Shutdown Current = 1.4μA (typ)
- SPI Interface
- Supports a Single 1.8V Supply with Separate 3.1V to 5.25V LED Supply
- Miniature 2.8mm x 2.0mm, 6x4, 0.4mm Ball Pitch WLP Package
- -40°C to +85°C Operating Temperature Range
Applications
- Fitness Wearable Devices
- In-Ear Wearable Devices
- SpO2 Monitoring Devices
- Wrist-Worn Wearable Devices
