Datasheet MAXM86161 (Maxim)

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MAXM86161 Single-Supply Integrated Optical Module for HR and SpO2 Measurement General Description Benefits and Features
The MAXM86161 is an ultra-low-power, completely inte- ● Complete Single-Channel Optical Data Acquisition grated, optical data-acquisition system. On the transmitter System side, the MAXM86161 has three programmable high- ● Built-In Algorithm Further Enhances Rejection of Fast current LED drivers. On the receiver side, MAXM86161 Ambient Transients consists of a high efficiency PIN photo-diode and an opti- cal readout channel. The optical readout has a low-noise ● Optimized Architecture for Reflective Heart Rate and signal conditioning analog front-end (AFE), including SpO2 Monitoring 19-bit ADC, an industry-lead ambient light cancellation ● Low Dark Current Noise of < 50pA RMS (Sample-to- (ALC) circuit, and a picket fence detect and replace Sample Variance) algorithm. Due to the low power consumption, compact ● Lower Effective Dark Current Noise Achievable size, easy, flexible-to-use, and industry lead ambient light through Multiple Sample Modes and On-Chip rejection capability of the MAXM86161, the device is ideal Averaging for a wide variety of optical sensing applications such as heart rate detection and pulse oximetry. ● High-Resolution 19-bit Charge Integrating ADC The MAXM86161 operates on a 3.0V to 5.5V V ● Three Low-Noise 8-Bit LED Current DACs LED single supply voltage. It supports a standard compatible ● Excellent Dynamic Range > 89dB in White Card interface and fully autonomous operation. Each device Loop-Back Test (Sample-to-Sample Variance) has a large 128-word built-in FIFO. The MAXM86161 is ● Excellent Ambient Range and Rejection Capability available in compact 2.9mm x 4.3mm x 1.4mm, 14-pin • > 100μA Ambient Photodetector Current OLGA package. • > 70dB Ambient Rejection at 120Hz
Applications
● Ultra-Low-Power Operation for Wearable Devices • Low-Power Operation, Optical Readout Channel ● Optimized for In-Ear Applications < 10μA, Typical at 25sps ● Miniature Package for Mobile Applications • Short Exposure Integration Period of 14.8μs, ● Optimized Performance to Detect: 29.4μs, 58.7μs, 117.3μs • Optical Heart Rate • Low Shutdown Current = 1.6µA (typ) • Oxygen Saturation (SpO2) ● Miniature 2.9mm x 4.3mm x 1.4mm, 14-pin OLGA • Continuous Monitoring for HRV Package ● -40°C to +85°C Operating Temperature Range
Ordering Information appears at end of data sheet.
19-100523; Rev 0; 3/19 Document Outline General Description Applications Benefits and Features Simplified Block Diagram Absolute Maximum Ratings Package Information Electrical Characteristics Typical Operating Characteristics Pin Configuration Pin Description Detailed Description Optical Subsystem LED Driver FIFO Configuration LED Sequence Control (0x20 to 0x22) Pseudo-Code Example of Initialize the Optical AFE Pseudo-Code for Interrupt Handling with FIFO_A_FULL Pseudo-Code Example of Reading Data from FIFO Optical Timing One LED Pulsing with No Direct Ambient Sampling One LED Pulsing with Direct Ambient Sampling Two LEDs Pulsing Sequentially with Direct Ambient Sampling All LEDs Pulsing Sequentially with Direct Ambient Sampling ADC Architecture and Transfer Function Non-Linearity (XNL) Trim Proximity Mode Function Picket Fence Detect-and-Replace Function Layout Guidelines I2C/SMBus Compatible Serial Interface Detailed I2C Timing Diagram Bit Transfer START and STOP Conditions Early STOP Conditions Slave Address Acknowledge Bit I2C Write Data Format I2C Read Data Format Register Map Register Details INTERRUPT STATUS 1 (0x00) INTERRUPT STATUS 2 (0X01) INTERRUPT ENABLE 1 (0X02) INTERRUPT ENABLE 2 (0X03) FIFO WRITE POINTER (0X04) FIFO READ POINTER (0X05) OVER FLOW COUNTER (0X06) FIFO DATA COUNTER (0X07) FIFO DATA REGISTER (0X08) FIFO CONFIGURATION 1 (0X09) FIFO CONFIGURATION 2 (0X0A) SYSTEM CONTROL (0X0D) PPG SYNC CONTROL (0X10) PPG CONFIGURATION 1 (0X11) PPG CONFIGURATION 2 (0X12) PPG CONFIGURATION 3 (0X13) PROX INTERRUPT THRESHOLD (0X14) PHOTO DIODE BIAS (0X15) PICKET FENCE (0X16) LED SEQUENCE REGISTER 1 (0X20) LED SEQUENCE REGISTER 2 (0X21) LED SEQUENCE REGISTER 3 (0X22) LED1 PA (0x23) LED2 PA (0x24) LED3_PA (0x25) LED PILOT PA (0x29) LED RANGE 1 (0X2A) S1 HI RES DAC1 (0x2C) S2 HI RES DAC1 (0x2D) S3 HI RES DAC1 (0x2E) S4 HI RES DAC1 (0x2F) S5 HI RES DAC1 (0x30) S6 HI RES DAC1 (0x31) DIE TEMPERATURE CONFIGURATION (0X40) DIE TEMPERATURE INTEGER (0X41) DIE TEMPERATURE FRACTION (0X42) DAC CALIBRATION ENABLE (0X50) SHA COMMAND (0XF0) SHA CONFIGURATION (0XF1) MEMORY CONTROL (0XF2) MEMORY INDEX (0XF3) MEMORY DATA (0XF4) PART ID (0XFF) Ordering Information Revision History