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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.
Reflective or Transmissive Heart Rate, Heart Rate Variability, or SpO2Monitoring
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
