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Optimized Pulse-Oximeter and Heart Rate AFE for Wearable Health

Optimized Pulse-Oximeter and Heart Rate AFE for Wearable Health

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.

Key Features

  • 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

Applications/Uses

  • Fitness Wearable Devices
  • In-Ear Wearable Devices
  • SpO2 Monitoring Devices
  • Wrist-Worn Wearable Devices
Parametric specs for Bio-Sensors
ISUPPLY (µA) (typ) 23
Shutdown Mode Supply Current (µA) (typ) 1.4
VSUPPLY (V) (min) 1.7
VSUPPLY (V) (max) 2
Resolution (bits) (ADC) 19
SNR (dB) 89
Oper. Temp. (°C) -40 to +85
Package/Pins WLP/24
Budgetary
Price (See Notes)
$2.60 @1k
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Simplified Block Diagram

MAX30112: Simplified Block Diagram MAX30112: Simplified Block Diagram Zoom icon

Technical Docs

Design & Development

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Description

The MAX30110 evaluation kit (EV kit) allows for the quick evaluation of the MAX30110 and MAX30112 optical AFE for applications at various sites on the body, particularly the wrist. MAX30110 supports standard SPI compatible interface, whereas MAX30112 supports I2C compatible interface. The EV kit allows flexible configurations to optimize measurement signal quality at minimal power consumption. The EV kit helps the user quickly learn how to configure and use the MAX30110 and MAX30112.

The EV kit consists of three boards. MAX30110_UC_ EVKIT is the main data acquisition board while MAX30110_SFH7050_EVKIT and MAX30110_OSB_EVKIT are the sensor daughter boards in which the MAX30110 devices are placed in different optical configurations. The EV kit is powered using the USB supply to generate +1.8V for the AFE and accelerometer and +4.5V for the LEDs.

The EV kit comes with a MAX30110EWG+ in a 24-bump wafer-level package (WLP).

View Details

Features

  • Quick Evaluation of the MAX30110
  • Supports Optimization of Configurations
  • Facilitates Understanding MAX30110 Architecture and Solution Strategy
  • Real-Time Monitoring
  • Data-Logging Capabilities
  • USB-Powered
  • On-Board Accelerometer

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SIMULATION MODELS

MAX30112 IBIS Model

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Parameters

Parametric specs for Bio-Sensors
ISUPPLY (µA) (typ) 23
Shutdown Mode Supply Current (µA) (typ) 1.4
VSUPPLY (V) (min) 1.7
VSUPPLY (V) (max) 2
Resolution (bits) (ADC) 19
SNR (dB) 89
Oper. Temp. (°C) -40 to +85
Package/Pins WLP/24
Budgetary
Price (See Notes)
$2.60 @1k

Key Features

  • 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

Applications/Uses

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

Description

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.

Simplified Block Diagram

MAX30112: Simplified Block Diagram MAX30112: Simplified Block Diagram Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal