Complete Optical Biosensing Module with Ultra-Low-Power Biometric Sensor Hub

Supports Simultaneous Heart Rate (HR) & Pulse Blood Oxygen Saturation (SpO2) Measurements

Please check latest availability status for a specific part variant.


The MAXM86146 is the world’s smallest highly-integrated, optical data acquisition system. It combines Maxim's bestin- class optical biosensing analog front end (AFE) with a powerful Arm® microcontroller unit (MCU) and two high sensitivity photodiodes.

The integrated MCU is an ultra-low-power microcontroller specifically designed for battery-powered devices and wireless sensors. It combines a flexible and versatile power management unit that operates from a single 1.8V supply. It supports I2C communication protocol and is ready to be programmed with the latest firmware and world-class algorithms for wearable applications including pulse heart rate (HR), pulse blood oxygen saturation (SpO2). The integrated algorithms adjust the optical AFE settings to maximize SNR while minimizing power consumption based on activity classification.

The optical AFE has two low-noise optical readout channels. Both channels have independent 19-bit ADCs and an industry-leading ambient light cancellation (ALC) circuit for unparalleled ambient-light rejection in many scenarios. The optical AFE includes three high-current, low-noise LED drivers and operates on a 1.8V main supply voltage and a flexible LED driver supply voltage.

With the addition of external LEDs and an accelerometer (required), a complete system is achieved reducing time to market and simplifying design. This arrangement seamlessly enables customer-desired on-chip processing, resulting in a highly-integrated sensor hub with embedded algorithms.

The MAXM86146 is available in a compact 4.5mm x 4.1mm x 0.88mm, 38-pin OLGA package and operates over commercial temperature range of 0°C to +70°C.

MAXM86146: Simplified Block Diagram MAXM86146: Simplified Block Diagram Enlarge+

Key Features

  • Complete Biometric Sensor Hub
    • Supports Simultaneous Wrist-Based Pulse Heart Rate (WHRM) and Pulse Blood Oxygen Saturation (WSpO2) Measurements
    • Integrated MAX86141 Dual-Channel Optical AFE
    • Integrated MAX32664C Arm® Cortex®-M4 based MCU
    • Two Integrated 3.8mm2 PIN Photodiodes
      • Can Operate Independently (Two Channels)
      • Can Be Combined to Give a Total Radiant Area of 7.6mm2 for Additional Flexibility
    • Excellent SNR Enables Measurements on a Wide Range of Users
      • Dynamic Range > 90dB in White Card Loop- Back Test (Sample-to-Sample Variance)
      • Dynamic Range Extendable to > 104dB for SpO2 and > 110dB for HRM with Multiple Sample Modes and On-Chip Averaging
    • Convenient Solution Enables Faster Time-to-Market
    • Ultra-Small 4.5mm x 4.1mm x 0.88mm, 38-Pin OLGA Package Size
  • World-Class Algorithm for Wearable Applications
    • Supports Multiple Accelerometer Options to Allow Robust Detection and Rejection of Motion Artifacts
    • Both Raw and Processed Data are Available
    • FIFO Provides Minimal Host Interaction
    • Ultra-Low Power for Body Wearable Devices
      • AFE Only Requires 10μA Typical at 25sps
      • MCU Supports Deep-Sleep Mode, Allowing Device to Sleep Between Measurements.
      • Automatic Exposure Control (AEC) Algorithm Adjusts the Optical AFE Settings, Maximizing SNR while Minimizing Power Consumption


  • Wearable Devices for Fitness and Wellness
  • Optimized for Wrist, Finger, and Other Locations
  • Optimized Performance to Detect: Pulse Heart Rate (HR) and Arterial Oxygen Saturation (SpO2)

See parametric specs for Bio-Sensors (19)

Part NumberIntegrated LEDsVSUPPLY
MAXM86146 NEW!Integrated PDs1.7219

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

MAXM86146EVSYS: Evaluation Kit for the MAXM86146

Technical Documents

User Guide 6806 MAX32664 User Guide
Request Reliability Report for: MAXM86146 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

Quality Management System >
Environmental Management System >


Related Resources

Complete Optical Biosensing Module with Ultra-Low-Power Biometric Sensor Hub

  • Complete Biometric Sensor Hub
  • World-Class Algorithm for Wearable Applications

±0.25°C Accurate I2C Temperature Sensor

  • High Accuracy
  • Long Battery Life
  • Small Size

1-Wire® Temperature Sensor with ±1ºC Accuracy

  • 1-Wire Interface Requires Only One Port Pin for Communication
  • Unique 64-bit Serial Code Stored in an On-Board ROM
  • External Resistor Selects Address for Location Identification

Integrated Optical Sensor Module for Mobile Health

  • Miniature 3.5mm x 7.0mm x 1.5mm, 14-Pin Optical Module
  • Optical-Grade Glass for Long-Term Optimal and Robust Performance
  • Ultra-Low-Power Operation for Mobile Device

Type ID Title
User Guide 6806 MAX32664 User Guide