Click here for production status of specific part numbers. MAX86140/ Best-in-Class Optical Pulse Oximeter and MAX86141 Heart-Rate Sensor for Wearable Health General Description Benefits and Features The MAX86140/MAX86141 are ultra-low-power, com- Complete Single and Dual-Channel Optical Data pletely integrated, optical data acquisition systems. On Acquisition System the transmitter side, the MAX86140/MAX86141 have Optimized Architecture for Transmissive and three programmable high-current LED drivers that can be Reflective Heart Rate or SpO Monitoring 2 configured to drive up to six LEDs using an external 3x2:1 Low Dark Current Noise of < 50pA RMS (Sample to mux. With two MAX86140/MAX86141 devices working in Sample Variance) master-slave mode, the LED drivers can drive up to twelve LEDs using an external 3x2:1 mux. On the receiver side, Lower Effective Dark Current Noise Achievable Through MAX86140 consists of a single optical readout channel, Multiple Sample Modes and On-Chip Averaging while the MAX86141 has two optical readout channels High-Resolution, 19-Bit Charge Integrating ADC that can operate simultaneously. The devices have low- Three Low-Noise, 8-Bit LED Current DACs noise signal conditioning analog front-end (AFE) including 19-bit ADC, an industry-lead ambient light cancellation Excellent Dynamic Range > 89dB in White Card (ALC) circuit, and a picket fence detect and replace func- Loop-Back Test (Sample-to-Sample Variance) tion. Due to the low power consumption, compact size, Dynamic Range Extendable to > 104dB for SpO 2 ease of use, and industry-lead ambient light rejection and > 110dB for HRM with Multiple Sample Modes capability of MAX86140/MAX86141, the devices are ideal and On-Chip Averaging for a wide variety of optical-sensing applications, such as Excellent Ambient Range and Rejection Capability pulse oximetry and heart rate detection. > 100A Ambient Photodetector Current The MAX86140/MAX86141 operate on a 1.8V main sup- > 70dB Ambient Rejection at 120Hz ply voltage and a 3.1V to 5.5V LED driver supply voltage. Ultra-Low-Power Operation for Wearable Devices Both devices support a standard SPI compatible interface Low-Power Operation, Optical Readout Channel and fully autonomous operation. Each device has a large < 10A (typ) at 25sps 128-word built-in FIFO. The MAX86140/MAX86141 is Short Exposure Integration Period of 14.8s, available in compact wafer-level package (WLP) (2.048 x 29.4s, 58.7s, 117.3s 1.848mm) with 0.4mm ball pitch. Low Shutdown Current = 0.6A (typ) Rejection of Fast Ambient Transients Applications Miniature 2.048 x 1.848mm, 5 x 4 0.4mm Ball Pitch WLP Wearable Devices for Fitness, Wellness and Medical Applications -40C to +85C Operating Temperature Range Optimized for Wrist, Finger, Ear, and Other Locations Optimized Performance to Detect Optical Heart Rate Ordering Information appears at end of data sheet. Oxygen Saturation (SpO ) 2 Muscle Oxygen Saturation (SmO and StO ) 2 2 19-100051 Rev 4 10/21MAX86140/ Best-in-Class Optical Pulse Oximeter and MAX86141 Heart-Rate Sensor for Wearable Health Detailed Block Diagrams MAX86140 PGND GND ANA GND DIG VLED VDD ANA VDD DIG A1 D3 D2 C2 C4 C3 MAX86140 LED1 DRV D1 8-BIT DAC 10MHz LED DRIVER A B2 INT OSCILLATOR TIMING AND B3 GPIO1 LED2 DRV C1 CONTROL B4 GPIO2 32kHz 8-BIT DAC LED DRIVER B OSCILLATOR LED3 DRV B1 8-Bit DAC LED DRIVER C ANALOG AMBIENT SPI A2 SCLK VREF B5 REF LIGHT CANCELLATION INTERFACE A3 SDO CONTROL DIGITAL AMBIENT 19-BIT CURRENT 128-WORD LIGHT CANCELLATION MODE ADC A4 SDI FIFO A5 CSB PD1 IN D5 PDBIAS PD GND C5 12-BIT TEMPERATURE N.C D4 SENSOR Maxim Integrated 2 www.maximintegrated.com