Overview

Features and Benefits

  • 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)
  • I2C 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

Product Details

The MAX30112 is a complete optical pulse oximetry and heart rate detection integrated analog front-end. The MAX30112 has a high-resolution, optical readout signal-processing channel with built-in ambient light cancellation, as well as high-current LED driver DACs, to form a complete optical readout signal chain. With external LED(s) and photo diode(s), the MAX30112 offers the lowest power, highest performance heart rate detection solution for wrist applications.

The MAX30112 operates on a 1.8V main supply voltage, with a separate 3.1V to 5.25V LED driver power supply. The device supports a standard I2C compatible interface, as well as shutdown modes through the software with near-zero standby current, allowing the power rails to remain powered at all times.

Applications

  • Fitness Wearable Devices
  • In-Ear Wearable Devices
  • SpO2 Monitoring Devices
  • Wrist-Worn Wearable Devices

Product Categories

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

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Reference Designs (1)

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