MAXM86146 Optical Biosensing Module

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Maxim MAXM86146 Optical Biosensing Module combines Maxim's best-in-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. The Maxim MAXM86146 combines a flexible and versatile power management unit that operates from a single 1.8V supply. It supports the I2C communication protocol and is ready to be programmed with the latest firmware and world-class algorithms for wearable applications that include pulse heart rate (HR) and 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, which reduces time to market and simplifies 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 a commercial temperature range of 0°C to +70°C.

  • 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 the device to sleep between measurements
      • Automatic Exposure Control (AEC) algorithm adjusts the optical AFE settings, maximizing SNR while minimizing power consumption


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