MAX86150EFF+T

EVALUATION KIT AVAILABLE Click here for production status of specific part numbers. MAX86150 Integrated Photoplethysmogram and Electrocardiogram Bio-Sensor Module For Mobile Health General Description The MAX86150 is an integrated electrocardiogram, pulse oximeter, heart rate monitor sensor module. It includes internal LEDs, photodetector, and low-noise electronics with ambient light rejection. The MAX86150 helps ease design-in to mobile and wearable devices. The MAX86150 operates on a 1.8V supply voltage with a separate power supply for the internal LEDs. Communication to and from the module is entirely through a standard I2C-compatible interface. The module can be shut down through software with near zero standby current, allowing the power rails to remain powered at all times. Applications Benefits and Features ●● Electrocardiogram (ECG) Optimized for Dry Electrode Operation ●● Reflective Heart Rate Monitor and Medical-Grade Pulse Oximeter ●● Miniature 3.3mm x 5.6mm x 1.3mm 22-pin Optical Module • Optical-Grade Glass for Long-Term Optimal and Robust Performance ●● Ultra-Low Power Operation for Mobile Devices • Ultra-Low Shutdown Current (0.7μA Typical) ●● High SNR and Robust Ambient Light Cancellation ●● -40°C to +85°C Operating Temperature Range ●● Smartphones ●● Tablets ●● Wearable Devices Ordering Information appears at end of data sheet. ●● Fitness Assistant Devices Simplified Block Diagram HOST (AP) OPTICAL ELECTRICAL APPLICATIONS DIGITAL NOISE CANCELLATION HARDWARE FRAMEWORK LED DRIVERS ALGORITHMS DRIVER I2C DATA FIFO 19-BIT ADC HUMAN FINGER RED/IR LEDS PHOTODIODE GLASS LID AMBIENT LIGHT CANCELLATION 18-BIT ADC AMBIENT LIGHT AFE PACKAGING ELECTRODES MAX86150 19-8402; Rev 2; 12/18 LEFT HAND RIGHT HAND MAX86150 Integrated Photoplethysmogram and Electrocardiogram Bio-Sensor Module For Mobile Health TABLE OF CONTENTS General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Benefits and Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Simplified Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Package Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Electrical Characteristics (continued) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Electrical Characteristics (continued) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Electrical Characteristics (continued) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Typical Operating Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Photoplethysmogram (PPG) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Photoplethysmogram (PPG) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Electrocardiogram (ECG) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Pin Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Functional Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Detailed Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 SpO2 Subsystem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 LED Driver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Proximity Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Electrocardiogram (ECG) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 ECG and PPG Synchronization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Register Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Register Details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Interrupt Status 1 (0x00) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Interrupt Status 2 (0x01) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Interrupt Enable 1 (0x02) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Interrupt Enable 2 (0x03) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 FIFO Write Pointer (0x04) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Overflow Counter (0x05) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 FIFO Read Pointer (0x06) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 FIFO Data Register (0x07) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 FIFO Configuration (0x08) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 FIFO Data Control Register 1 (0x09) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 FIFO Data Control Register 2 (0x0A) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 System Control (0x0D) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 PPG Configuration 1 (0x0E) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 www.maximintegrated.com Maxim Integrated │  2 MAX86150 Integrated Photoplethysmogram and Electrocardiogram Bio-Sensor Module For Mobile Health TABLE OF CONTENTS (CONTINUED) PPG Configuration 2 (0x0F) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 Prox Interrupt Threshold (0x10) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 LED2 PA (0x12) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 LED Range (0x14) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 ECG Configuration 1 (0x3C) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 ECG Configuration 3 (0x3E) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 Part ID (0xFF) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 Applications Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 Power Sequencing and Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 Power-Up Sequencing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 Power-Down Sequencing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 I2C Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 Bit Transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 START and STOP Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 Early STOP Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 Slave Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 Acknowledge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 Write Data Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 Read Data Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 FIFO Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 FIFO Data Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 FIFO Data Control Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 FIFO Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 FIFO Flush . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 FIFO Organization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 Typical Application Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 www.maximintegrated.com Maxim Integrated │  3 MAX86150 Integrated Photoplethysmogram and Electrocardiogram Bio-Sensor Module For Mobile Health LIST OF FIGURES Figure 1. I2C-Compatible Interface Timing Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Figure 2. MAX86150 ECG Subsystem Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Figure 3. Power-Up Sequence of the Power Supply Rails . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 Figure 4. START, STOP, and REPEATED START Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 Figure 5. I2C Acknowledge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 Figure 6. Writing One Data Byte to MAX86150 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 Figure 7. Reading One Byte of Data from MAX86150 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 Figure 8. Reading Multiple Bytes of Data from the MAX86150 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 Figure 9. Example of FIFO Organization with Four Active Elements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 Figure 10. Example of FIFO Organization with Two Active Elements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 LIST OF TABLES Table 1. FIFO Data Control registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 Table 2. FDx Format Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 Table 3. FIFO Data Format​ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 Table 4. Sample of FIFO Data Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 Table 5. FIFO Handling Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 Table 6. FIFO Sample Elements Order with four active elements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 Table 7. FIFO Sample Elements Order with two active elements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 www.maximintegrated.com Maxim Integrated │  4 MAX86150 Integrated Photoplethysmogram and Electrocardiogram Bio-Sensor Module For Mobile Health Absolute Maximum Ratings VDD_ANA to GND_ANA.........................................-0.3V to +2.2V VDD_DIG to GND DIG...........................................-0.3V to +2.2V VDD_ANA to VDD_DIG...................................... VDD_DIG - 0.3V to VDD_DIG + 0.3V GND_ANA to GND_DIG................................ GND_DIG - 0.3V to GND_DIG + 0.3V PGND to GND_ANA..............................................-0.3V to +0.3V VLED to PGND......................................................-0.3V to +6.0V ECG_P, ECG_N, ECG_C to GND_ANA...............-0.3V to +2.2V C1_P, C1_N to GND_ANA....................................-0.3V to +2.2V IDRV_P, IDRV_N to GND_ANA............................-0.3V to +2.2V VREF to GND_ANA...............................................-0.3V to +2.2V Output Short-Circuit Duration.....................................Continuous Continuous Input Current Into Any Pin..............................±20mA SDA, SCL, INTB to GND_ANA.............................-0.3V to +6.0V OESIP (derate 5.5mW/°C above +70°C) ..............-40°C to 85°C Operating Temperature Range............................ -40°C to +85°C Junction Temperature.......................................................+150°C Storage Temperature Range............................. -40°C to +105°C Soldering Temperature (reflow)........................................+260°C Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Package Information PACKAGE TYPE: 22 OLGA Package Code F223A5+1 Outline Number 21-100071 Land Pattern Number 90-100024 THERMAL RESISTANCE, FOUR LAYER BOARD: Junction-to-Ambient (θJA) 180°C/W Junction-to-Case Thermal Resistance (θJC) 150°C/W For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial. www.maximintegrated.com Maxim Integrated │  5 MAX86150 Integrated Photoplethysmogram and Electrocardiogram Bio-Sensor Module For Mobile Health Electrical Characteristics (VDD_ANA = VDD_DIG = 1.8V, VLED = 3.3V, VGND_ANA = VGND_DIG = VPGND = 0V, TA = +25°C, min/max are from TA = -40°C to +85°C, unless otherwise noted.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Power Supply Voltage VDD Guaranteed by RED and IR count tolerance 1.7 1.8 2.0 V LED Supply Voltage VLED Guaranteed by PSRR of LED driver 3.1 3.3 5 V Heart rate/SpO2 mode; PPG_LED_PW = 50μs; PPG_SR = 100sps; LED driver = 0mA 400 750 Heart rate/SpO2 mode; PPG_LED_PW = 50μs; PPG_SR = 10sps; LED driver = 0mA 400 ECG sample rate = 200Hz 340 750 Heart rate mode; PPG_LED_PW = 50μs; PPG_SR = 100sps, LED driver = 0mA 0.03 1 Heart rate mode; PPG_LED_PW = 50μs; PPG_SR = 100sps, LED driver = 50mA 350 Heart rate mode; PPG_LED_PW = 50μs; PPG_SR = 10sps, LED driver = 50mA 50 ILED SpO2 mode; PPG_LED_PW = 50μs; PPG_SR = 100sps, LED driver = 50mA 750 ILED SpO2 mode; PPG_LED_PW = 50μs; PPG_SR = 10sps; LED driver = 50mA 80 ISHDN TA = +25°C 0.5 12 μA ISHDNVLED TA = +25°C 0 1 μA 1.204 1.215 V POWER SUPPLY VDD Supply Current IDD ILED VLED Supply Current VDD Current in Shutdown VLED Current in Shutdown Reference Voltage (Note 2) VREF Bypass to GND_ANA with 1µF 1.192 μA μA PULSE OXIMETRY/HEART RATE SENSOR CHARACTERISTICS ADC Resolution 19 bits RED_C Proprietary ATE setup, LED2_PA = 0x16, PPG_LED_PW = 50μS, PPG_SR = 100sps, TA = +25°C 120,072 140,072 160,072 Counts IR ADC Count (Note 3) IR_C Proprietary ATE setup, LED1_PA = 0x16, PPG_LED_PW = 50μS, PPG_SR = 100sps, TA = +25°C 136,072 156,072 176,072 Counts Dark Current Counts DC_C ALC = ON, LED2_PA = LED1_PA = 0x00, PPG_LED_PW = 50μS, PPG_SR = 100sps, PPG_ADC_RGE[1:0] = 8μA, TA = +25°C 0.0004 0.01 % of FS 0.05 0.5 % of FS 0.05 0.5 % of FS 9.8304 10.027 MHz Red ADC Count (Note 3) RED/IR ADC Count PSRR (VDD) PSRR_VDD Propriety ATE setup, 1.7V < VDD < 2.0V, LED1_PA = 0x16, LED2_PA = 0x16, PPG_LED_PW = 50μS, PPG_SR = 100sps, TA = +25°C RED/IR ADC Count— PSRR (LED Driver Outputs) PSRR_LED Propriety ATE setup, 3.1V < VLED < 5V, LED1_ PA = 0x16, LED2_PA = 0x16, PPG_LED_PW = 50μS, PPG_SR = 100sps, TA = +25ºC ADC Clock Frequency CLK www.maximintegrated.com 9.633 Maxim Integrated │  6 MAX86150 Integrated Photoplethysmogram and Electrocardiogram Bio-Sensor Module For Mobile Health Electrical Characteristics (continued) (VDD_ANA = VDD_DIG = 1.8V, VLED = 3.3V, VGND_ANA = VGND_DIG = VPGND = 0V, TA = +25°C, min/max are from TA = -40°C to +85°C, unless otherwise noted.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS 870 880 900 nm 650 660 670 nm IR LED (LED1) CHARACTERISTICS (Note 4) LED Peak Wavelength λP ILED = 20mA, TA = +25°C RED LED (LED2) CHARACTERISTICS (Note 4) LED Peak Wavelength λP ILED = 20mA, TA = +25°C LED DRIVERS LED Current Resolution LED Drive Current ILED 8 bits LEDx_RGE = 0x0 50 mA LEDx_RGE = 0x1 100 ECG (Note 5) ADC Resolution Gain 18 G VIN = ±10mVDC, TA = +25°C, VDIFF = 0mV (Note 6) Gain Error VIN = 20mVP-P,AC ±400mVDC, IA_GAIN = 9.5, PGA_GAIN = 8, f = 84Hz, TA = +25°C DC Differential Input Range VIN = 20mVP-P,AC, f = 84Hz, gain error < 2.2%, TA = +25°C CMRR 72 76 -400 bits 80 V/V 2.2 % +400 mV Balanced Inputs, 60Hz with ±300mV differential DC offset, per AAMI/IEC standard, lead biasing enabled 136 dB 51kΩ // 47nF imbalance, 60Hz with ±300mV differential DC offset, per AAMI/IEC standard, lead biasing enabled 78 dB dB DC CMRR Gain = 76V/V, input pins tied together (no electrodes), 0.2V < VIN < 1.0V 80 120 DC PSRR Gain = 76V/V, input pins tied together (no electrodes), 1.7V < VDD < 2.0V 70 100 AC PSRR ECG_P/N tied together, AC signal at 60Hz, 10mVP-P to VDD, lead bias disabled 95 dB Input Impedance ECG_P or ECG_N to GND_ANA, DC, lead biasing enabled 100 MΩ Input Referred Noise Gain = 76V/V, inputs tied together on chip, ECG sample rate = 400sps (Register 0x3C = 0x02), 0.5Hz to 100Hz 0.76 μVRMS www.maximintegrated.com Maxim Integrated │  7 MAX86150 Integrated Photoplethysmogram and Electrocardiogram Bio-Sensor Module For Mobile Health Electrical Characteristics (continued) (VDD_ANA = VDD_DIG = 1.8V, VLED = 3.3V, VGND_ANA = VGND_DIG = VPGND = 0V, TA = +25°C, min/max are from TA = -40°C to +85°C, unless otherwise noted.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS 0.4 V 0.4 V DIGITAL CHARACTERISTICS (SDA, SCL, INTB) Output Low Voltage SDA, INTB VOL ISINK = 6mA I2C Input Voltage Low VIL_I2C SDA, SCL I2C Input Voltage High VIH_I2C SDA, SCL Input Hysteresis (Note 3) VHYS SDA, SCL 200 mV Input Capacitance (Note 3) CIN SDA, SCL 10 pF Input Leakage Current IIN 1.4 V VIN = 0V, TA = +25°C (SDA, SCL) 0.01 1 VIN = VDD, TA = +25°C (SDA, SCL) 0.01 1 μA I2C TIMING CHARACTERISTICS (SDA, SCL) (Note 4, Figure 1) I2C Write Address BC Hex I2C BD Hex Read Address Serial Clock Frequency fSCL 0 Bus Free Time Between STOP and START Conditions 400 kHz tBUF 1.3 µs Hold Time (Repeated) START Condition tHD,STA 0.6 µs SCL Pulse-Width Low tLOW 1.3 µs SCL Pulse-Width High tHIGH 0.6 µs Setup Time for a Repeated START Condition tSU,STA 0.6 µs Data Hold Time tHD,DAT 0 Data Setup Time tSU,DAT 100 ns Setup Time for STOP Condition tSU,STO 0.6 µs Pulse Width of Suppressed Spike tSP 0 Bus Capacitance CB SDA and SCL Receiving Rise Time tR SDA and SCL Receiving Fall Time SDA Transmitting Fall Time www.maximintegrated.com 900 ns 50 ns 400 pF 20 + 0.1CB 300 ns tF 20 + 0.1CB 300 ns tF 20 + 0.1CB 300 ns Maxim Integrated │  8 MAX86150 Integrated Photoplethysmogram and Electrocardiogram Bio-Sensor Module For Mobile Health Electrical Characteristics (continued) (VDD_ANA = VDD_DIG = 1.8V, VLED = 3.3V, VGND_ANA = VGND_DIG = VPGND = 0V, TA = +25°C, min/max are from TA = -40°C to +85°C, unless otherwise noted.) (Note 1) Note 1: All devices are 100% production tested at TA = +25°C. Specifications over temperature limits are guaranteed by Maxim Integrated’s bench or proprietary automated test equipment (ATE) characterization. Note 2: Internal reference only. Note 3: Specifications are guaranteed by Maxim Integrated’s bench characterization and by 100% production test using proprietary ATE setup and conditions. Note 4: For design guidance only. Not production tested. Note 5: Test conditions: ECG sample rate = 1600Hz, ECG_ADC_OSR[1:0] = 00 (OSR = 16), ECG_ADC_CLK = 0 (25.6kHZ), IA_ GAIN[1:0] = 01 (IA_GAIN = 9.5), and PGA_ECG_GAIN[1:0] = 11 (PGA_GAIN = 8), VCM = 600mV, unless otherwise noted. Note 6: For measurements with DC difference as input, the highpass filter function is disabled. SDA tSU,STA tSU,DAT tLOW tHD,DAT tHD,STA tSP tBUF tSU,STO tHIGH SCL tHD,STA tR tF START CONDITION REPEATED START CONDITION STOP CONDITION START CONDITION Figure 1. I2C-Compatible Interface Timing Diagram www.maximintegrated.com Maxim Integrated │  9 MAX86150 Integrated Photoplethysmogram and Electrocardiogram Bio-Sensor Module For Mobile Health Typical Operating Characteristics (TA = +25°C, unless otherwise noted.) Photoplethysmogram (PPG) RED LED SUPPLY HEADROOM 80 60 ILED = 50mA 40 0 1 2 3 ILED = 100mA 100 80 60 ILED = 50mA 40 ILED = 20mA 20 toc02 120 ILED = 100mA 100 0 IR LED SUPPLY HEADROOM toc01 IR LED CURRENT (mA) RED LED CURRENT (mA) 120 ILED = 20mA 20 0 4 0 1 VLED VOLTAGE (V) 2 VDD SUPPLY CURRENT vs. SUPPLY VOLTAGE toc04 250000 LED_PW = 400µs PPG_SR = 400sps ADC FULL SCALE = 16384nA 200000 PPG+ECG MODE 0.7 ADC COUNTS SUPPLY CURRENT (mA) 0.9 0.6 PPG MODE 0.5 0.4 150000 IR 100000 0.3 SHUTDOWN MODE 0.2 0.1 0.0 50000 RED 0 0.0 0.5 1.0 2.0 1.5 2.5 0 toc05 VLED SHUTDOWN CURRENT (µA) 3.0 VDD = 1.8V 2.5 2.0 1.5 1.0 0.5 20 toc06 0.12 VDD = 2.0V 3.5 15 0.13 4.0 0.0 10 VLED SHUTDOWN CURRENT vs. TEMPERATURE VDD SHUTDOWN CURRENT vs. TEMPERATURE 4.5 5 DISTANCE (mm) SUPPLY VOLTAGE (V) VDD SHUTDOWN CURRENT (µA) 4 DC COUNTS vs. DISTANCE FROM WHITE HIGH IMPACT STYRENE CARD toc03 1.0 0.8 3 VLED VOLTAGE (V) VLED = 5.5V 0.11 0.10 0.09 0.08 VLED = 3.1V 0.07 VDD = 1.7V 0.06 -50 0 50 TEMPERATURE (°C) www.maximintegrated.com 100 -50 0 50 100 TEMPERATURE (°C) Maxim Integrated │  10 MAX86150 Integrated Photoplethysmogram and Electrocardiogram Bio-Sensor Module For Mobile Health Typical Operating Characteristics (continued) (TA = +25°C, unless otherwise noted.) Photoplethysmogram (PPG) RED LED SPECTRA AT +30°C IR LED SPECTRA AT +30°C toc07 100 120 NORMALIZED POWER (%) NORMALIZED POWER (%) 120 80 60 40 100 80 60 40 20 20 0 0 500 600 700 800 700 800 RED LED PEAK WAVELENGTH vs. TEMPERATURE PEAK WAVELENGTH (nm) PEAK WAVELENGTH (nm) LED_PW = 400µs PPG_SR = 400sps 900 665 660 toc10 905 LED_PW = 400µs PPG_SR = 400sps 670 1000 IR LED PEAK WAVELENGTH vs. TEMPERATURE toc09 675 900 WAVELENGTH (nm) WAVELENGTH (nm) ILED = 50mA 655 895 ILED = 20mA 890 885 880 ILED = 50mA 875 870 650 865 ILED = 20mA 645 toc08 -50 0 860 50 100 TEMPERATURE (°C) www.maximintegrated.com 150 -50 0 50 100 150 TEMPERATURE (°C) Maxim Integrated │  11 MAX86150 Integrated Photoplethysmogram and Electrocardiogram Bio-Sensor Module For Mobile Health Typical Operating Characteristics (continued) (TA = +25°C, unless otherwise noted.) Electrocardiogram (ECG) ECG CHANNEL GAIN vs. FREQUENCY ECG CHANNEL GAIN vs. TEMPERATURE toc11 90 toc12 45 40 35 30 80 GAIN (dB) ECG GAIN (V/V) 85 75 25 20 15 70 10 65 60 5 0 -60 -40 -20 0 20 40 60 80 100 0 20 DC DIFFERENTIAL INPUT RANGE 100 80 100 toc14 8 7 INPUT REFERRED NOISE (µV) 80 CHANNEL GAIN (V/V) 60 NOISE vs. GAIN toc13 90 70 60 50 40 30 20 6 5 4 3 2 1 10 0 40 FREQUENCY (Hz) TEMPERATURE (°C) 0 -1.0 -0.5 0.0 0.5 1.0 0 100 200 300 400 500 GAIN (V/V) DC OFFSET (V) ADC REFERENCE vs. TEMPERATURE toc15 1.2175 1.2170 ADC REFERENCE (V) 1.2165 1.2160 1.2155 1.2150 1.2145 1.2140 1.2135 1.2130 1.2125 1.2120 -40 -15 10 35 60 85 TEMPERATURE (°C) www.maximintegrated.com Maxim Integrated │  12 MAX86150 Integrated Photoplethysmogram and Electrocardiogram Bio-Sensor Module For Mobile Health Typical Operating Characteristics (continued) (TA = +25°C, unless otherwise noted.) INPUT COMMON-MODE VOLTAGE vs. TEMPERATURE (ECG_P) toc16 0.65 0.60 0.55 INPUT IMPEDANCE = 100MΩ 0.50 0.45 -40 -15 10 35 TEMPERATURE (°C) www.maximintegrated.com 60 0.70 COMMON-MODE VOLTAGE (V) COMMON-MODE VOLTAGE (V) 0.70 INPUT COMMON-MODE VOLTAGE vs. TEMPERATURE ECG_N 85 toc17 0.65 0.60 INPUT IMPEDANCE = 100MΩ 0.55 0.50 0.45 -40 -15 10 35 60 85 TEMPERATURE (°C) Maxim Integrated │  13 MAX86150 Integrated Photoplethysmogram and Electrocardiogram Bio-Sensor Module For Mobile Health Pin Configuration N.C. 21 C1_P 2 20 C1_N N.C. 3 19 VREF ECG_N 4 18 GND_ANA ECG_P 5 17 GND_DIG N.C. 1 N.C. 22 MAX86150 N.C. 6 16 PGND INTB 7 15 VLED SDA 8 14 VDD_ANA SCL 9 13 VDD_DIG N.C. 10 12 N.C. 11 N.C. www.maximintegrated.com Maxim Integrated │  14 MAX86150 Integrated Photoplethysmogram and Electrocardiogram Bio-Sensor Module For Mobile Health Pin Description PIN NAME 1–3, 6, 10–12, 22 N.C. FUNCTION N.C. No Connection. Connect to an unconnected PCB pad for mechanical stability. N.C. pin should not be connected to any signal, power, or ground pins. ECG 5 ECG_P Positive ECG Electrode 4 ECG_N Negative ECG Electrode 21 C1_P Capacitor for ECG HPF. Connect to C1_N through a 1μF capacitor. 20 C1_N Capacitor for ECG HPF. Connect to C1_P through a 1μF capacitor. CONTROL INTERFACE 8 SDA I2C Data 9 SCL I2C Clock 7 INTB Open-Drain Interrupt POWER 13 VDD_DIG Digital Logic Supply. Connect to externally regulated supply. Bypass to GND_DIG. 17 GND_DIG Digital Logic and Digital Pad Return. Connect to Ground. 14 VDD_ANA Analog Supply. Connect to externally regulated supply. Bypass to GND_ANA. 18 GND_ANA Analog Power Return. Connect to Ground. 15 VLED LED Power Supply Input. Connect to external battery supply. Bypass to PGND. 16 PGND LED Power Return. Connect to Ground. VREF Internal Reference Decoupling Point. Bypass to GND_ANA. REFERENCE 19 www.maximintegrated.com Maxim Integrated │  15 MAX86150 Integrated Photoplethysmogram and Electrocardiogram Bio-Sensor Module For Mobile Health Functional Diagrams 1μF 1.8V VDD_DIG VDD_ANA C1_N C1_P ECG_P ECG_N VLED 1.8V VREF 1μF 3.3V VREF ADC SDA DIGITAL CONTROLLER OR SIGNAL PROCESSOR ECG SCL INT RED IR VISIBLE + IR μC OR APPLICATIONS PROCESSOR ADC LED DRIVERS N.C. N.C. Detailed Description PGND The MAX86150 is a complete electrocardiogram, pulse oximetry, and heart rate sensor system solution module designed for the demanding requirements of mobile devices. The MAX86150 maintains a very small total solution size without sacrificing performance. Minimal external hardware components are necessary for integration into a mobile device. The MAX86150 is fully adjustable through software registers, and the digital output data is stored in a 32-deep FIFO within the device. The FIFO allows the MAX86150 to be connected to a microcontroller or processor on a shared bus, where the data is not being read continuously from the MAX86150’s registers. www.maximintegrated.com GND_ANA GND_DIG SpO2 Subsystem The SpO2 subsystem in the MAX86150 is composed of ambient light cancellation (ALC), a continuous-time sigma-delta ADC, and proprietary discrete time filter. The ALC has an internal DAC to cancel ambient light and increase the effective dynamic range. The internal ADC is a continuous time oversampling sigma delta converter with 19-bit resolution. The ADC output data rate can be programmed from 10sps (samples per second) to 3200sps. The MAX86150 includes a proprietary discrete time filter to reject 50Hz/60Hz interference and slow moving residual ambient noise. Maxim Integrated │  16 MAX86150 Integrated Photoplethysmogram and Electrocardiogram Bio-Sensor Module For Mobile Health LED Driver The MAX86150 integrates red and infrared LED drivers to modulate LED pulses for SpO2 and HR measurements. The LED current can be programmed from 0mA to 100mA with proper VLED supply voltage. The LED pulse width can be programmed from 50μs to 400μs to optimize accuracy of results and power consumption based on use cases. Proximity Function The MAX86150 includes a proximity function to save power and reduce visible light emission when the user’s finger is not on the sensor. Proximity function is enabled by setting PROX_INT_EN to 1. When the SpO2 or HR function is initiated, the IR LED is turned on in proximity mode with a drive current set by the PILOT_PA register. When an object is detected by exceeding the IR ADC count threshold (set in the PROX_INT_ THRESH register), PROX_INT interrupt is asserted and the part transitions automatically to the normal SpO2/HR mode. To reenter PROX mode, a new SpO2 or HR reading must be initiated (even if the value is the same). The proximity function can be disabled by resetting PROX_INT_EN to 0. In that case, when the SpO2 or HR function is initiated in the FIFO Data Control registers, the SpO2 or HR mode begins immediately. Electrocardiogram (ECG) The ECG subsystem in the MAX86150 is designed specifically for mobile applications. It features single-lead ECG technology that is optimized for dry electrode operation. It is comprised of Maxim proprietary analog front end (AFE), which includes an 18-bit ADC. Figure 2 shows the ECG Subsystem Block Diagram. The primary function of the AFE is to digitize heart signals. This process is complicated by the need to reject interference from strong RF sources, common-mode line frequency, signals from other muscles, and electrical noise. The electrical connections to the patient must not create a shock hazard or interfere with other equipment that might be connected to the device. The ECG subsystem also includes an on-chip highpass filter, which facilitates high SNR in real applications. The ADC output data rate can be programmed from 200sps (samples per second) to 3200sps. The output of the ADC is an 18-bit digital representation of the input voltage. Each data sample takes three bytes in the FIFO, and the data is right-justified and in bipolar two's-complement format. To calculate the equivalent differential input voltage of the ADC, the formula is as follows: V_INPUT = ADC_CODE x 12.247μV/IA_GAIN/PGA_GAIN where ADC_CODE is converted to a bipolar integer decimal format, which can be positive or negative. Note that only one gain setting, IA_GAIN = 9.5 and PGA_GAIN = 8, is trimmed to a tight tolerance at the factory, and the other gains are typical expected values only. 1μF 1μF 0.6V ECG_P C1_P C1_N INTERNAL VREF 20kΩ AC-COULED INSTRUMENTATION AMPLIFIER WITH CHOPPING 1.56pF ECG_N VREF 20kΩ X 1.56pF PGA INTB, SDA, SCL ΔΣ ADC DATA FIFO X COMMON-MODE AMPLIFIER ADC CLOCK Figure 2. MAX86150 ECG Subsystem Block Diagram www.maximintegrated.com Maxim Integrated │  17 MAX86150 Integrated Photoplethysmogram and Electrocardiogram Bio-Sensor Module For Mobile Health ECG and PPG Synchronization The MAX86155 allows for a simultaneous and synchronous collection of PPG and ECG signals. If the ECG sample rate is set higher than the PPG sample rate, the PPG sample rate defaults to the ECG sample rate if it can be supported. If the ECG sample rate is set above the maximum allowable PPG sample rate, then the PPG sample rate is set to the highest supported rate, and redundant data will be present in the FLEX FIFO. See Register 0x0E configuration table “Maximum Sample rates Supported for all the Pulse Widths and number of LEDs” to determine which sample rate the PPG defaults to if the ECG is set higher. For example, if the ECG sample rate is set to 400Hz, and PPG registers are set to 0x0E = 0xDB (Two LEDs, single pulse, PPG_SR = 100sps, PPG_LED_PW = 400μs) and Register 0x0F is set to 0x00 (SMP_AVE = 000, no sample averaging), then the PPG defaults to 400Hz, as this configuration is supported per the table in 0x0E Register description. Register Map ADDRESS NAME MSB LSB Status Registers 0x00 Interrupt Status 1[7:0] A_FULL_ PPG_ RDY_ ALC_OVF_ PROX_INT_ — — — PWR_ RDY_ 0x01 Interrupt Status 2[7:0] VDD_ OOR_ — — — — — — — 0x02 Interrupt Enable 1[7:0] A_FULL_ EN_ PPG_ RDY_EN_ ALC_OVF_ EN_ PROX_INT_ EN_ — — — — 0x03 Interrupt Enable 2[7:0] VDD_ OOR_EN_ — — — — — — — FIFO Registers 0x04 FIFO Write Pointer[7:0] — — — FIFO_WR_PTR_[4:0] 0x05 Overflow Counter[7:0] — — — OVF_COUNTER_[4:0] 0x06 FIFO Read Pointer[7:0] — — — FIFO_RD_PTR_[4:0] 0x07 FIFO Data Register[7:0] 0x08 FIFO Configuration[7:0] FIFO_DATA_[7:0] — A_FULL_ CLR_ A_FULL_ TYPE_ FIFO_ ROLLS_ ON_FULL_ FIFO_A_FULL_[3:0] FIFO Data Control 0x09 FIFO Data Control Register 1[7:0] FD2_[3:0] FD1_[3:0] 0x0A FIFO Data Control Register 2[7:0] FD4_[3:0] FD3_[3:0] System Control 0x0D System Control[7:0] — — — — — FIFO_EN_ SHDN_ RESET_ PPG Configuration 0x0E PPG Configuration 1[7:0] 0x0F PPG Configuration 2[7:0] 0x10 Prox Interrupt Threshold[7:0] www.maximintegrated.com PPG_ADC_RGE_[1:0] — — PPG_LED_PW_ [1:0] PPG_SR_[3:0] — — — SMP_AVE_[2:0] PROX_INT_THRESH_[7:0] Maxim Integrated │  18 MAX86150 Integrated Photoplethysmogram and Electrocardiogram Bio-Sensor Module For Mobile Health Register Map (continued) LED Pulse Amplitude 0x11 LED1 PA[7:0] 0x12 LED2 PA[7:0] 0x14 LED Range[7:0] 0x15 LED PILOT PA[7:0] LED1_PA_[7:0] LED2_PA_[7:0] — — — — LED2_RGE_[7:0] LED1_RGE_[7:0] PILOT_PA_[7:0] ECG Configuration 0x3C ECG Configuration 1[7:0] — — — — 0x3E ECG Configuration 3[7:0] — — — — — ECG_ ADC_ CLK_ ECG_ADC_OSR_ [1:0] PGA_ECG_ GAIN_[1:0] IA_GAIN_[1:0] Part ID 0xFF Part ID[7:0] PART_ID_[7:0] Register Details Interrupt Status 1 (0x00) BIT Field Reset Access Type 7 6 5 4 3 2 1 0 A_FULL PPG_RDY ALC_OVF PROX_INT — — — PWR_RDY 0x0 0x0 0x0 0x0 — — — 0x0 Read Only Read Only Read Only Read Only — — — Read Only A_FULL: FIFO Almost Full Flag VALUE ENUMERATION DECODE 0 OFF Normal Operation 1 ON Indicates that the FIFO buffer overflows the threshold set by FFIFO_A_FULL[3:0] on the next sample. This bit is cleared when the Interrupt Status 1 register is read. It is also cleared when FIFO_DATA register is read, if A_FULL_CLR = 1 PPG_RDY: New PPG FIFO Data Ready VALUE ENUMERATION 0 OFF Normal Operation 1 ON In SpO2 and HR modes, this interrupt triggers when there is a new sample in the data FIFO. The interrupt is cleared by reading the Interrupt Status 1 register (0x00), or by reading the FIFO_DATA register. www.maximintegrated.com DECODE Maxim Integrated │  19 MAX86150 Integrated Photoplethysmogram and Electrocardiogram Bio-Sensor Module For Mobile Health ALC_OVF: Ambient Light Cancellation Overflow VALUE ENUMERATION DECODE 0 OFF Normal Operation 1 ON This interrupt triggers when the ambient light cancellation function of the SpO2/HR photodiode has reached its maximum limit due to overflow, and therefore, ambient light is affecting the output of the ADC. The interrupt is cleared by reading the Interrupt Status 1 register (0x00). PROX_INT: Proximity interrupt If PROX_INT is masked then the prox mode is disabled and the select PPG begins immediately. This bit is cleared when the Interrupt Status 1 Register is read. VALUE ENUMERATION 0 OFF Normal Operation DECODE 1 ON Indicates that the proximity threshold has been crossed when in proximity mode. PWR_RDY: Power Ready Flag VALUE ENUMERATION DECODE 0 OFF Normal Operation 1 ON Indicates that VBATT went below the UVLO threshold. This bit is not triggered by a soft reset. This bit is cleared when Interrupt Status 1 Register is read. Interrupt Status 2 (0x01) BIT Field Reset Access Type 7 6 5 4 3 2 1 0 VDD_OOR — — — — ECG_RDY — — 0x0 — — — — 0x0 — — Read Only — — — — Read Only — — VDD_OOR: VDD Out-of-Range Flag This flag checks if the VDD_ANA supply voltage is outside supported range. VALUE ENUMERATION DECODE 0 OFF VDD_ANA between range. 1 ON Indicated that VDD_ANA is greater than 2.05V or less than 1.65V. This bit is automatically cleared when the Interrupt Status 2 register is read. The detection circuitry has a 10ms delay time and continues to trigger as long as the VDD_ANA is out of range. ECG_RDY: New ECG FIFO Data Ready This flag checks if the VDD_ANA supply voltage is outside supported range. VALUE ENUMERATION 0 OFF Normal Operation 1 ON Indicates that the ECG ADC has finished it’s existing conversion. www.maximintegrated.com DECODE Maxim Integrated │  20 MAX86150 Integrated Photoplethysmogram and Electrocardiogram Bio-Sensor Module For Mobile Health Interrupt Enable 1 (0x02) BIT 7 6 5 4 3 2 1 0 Field A_FULL_EN PPG_RDY_ EN ALC_OVF_ EN PROX_INT_ EN — — — — Reset 0x0 0x0 0x0 0x0 — — — — Write, Read Write, Read Write, Read Write, Read — — — — Access Type A_FULL_EN: FIFO Almost Full Flag Enable VALUE ENUMERATION 0 OFF A_FULL interrupt is disabled DECODE 1 ON A_FULL interrupt is enabled PPG_RDY_EN: New PPG FIFO Data Ready Interrupt enable VALUE ENUMERATION DECODE 0 OFF PPG_RDY interrupt is disabled 1 ON PPG_RDY interrupt is enabled. ALC_OVF_EN: Ambient Light Cancellation (ALC) Overflow Interrupt Enable The ALC_OVF flag is triggered when the ambient light cancellation function has reached its maximum limit due to overflow. At this point, the ADC output is affected by the ambient light. VALUE ENUMERATION DECODE 0 OFF ALC_OVF interrupt is disabled 1 ON ALC_OVF interrupt is enabled PROX_INT_EN: Proximity Interrupt Enable When the FIFO Data Control Register is configured to initiate PPG measurement, the IR LED is turned on in proximity mode with a drive current set by the PILOT_PA register. When an object is detected by exceeding the IR ADC count threshold (set in the PROX_INT_ THRESH register), PROX_INT interrupt is asserted and the part transitions to the normal SpO2/HR mode. VALUE ENUMERATION 0 OFF PROX_INT interrupt is disabled 1 ON PROX_INT interrupt is enabled www.maximintegrated.com DECODE Maxim Integrated │  21 MAX86150 Integrated Photoplethysmogram and Electrocardiogram Bio-Sensor Module For Mobile Health Interrupt Enable 2 (0x03) BIT 7 6 5 4 3 2 1 0 Field VDD_OOR_ EN — — — — ECG_ RDY_ EN — — Reset 0x0 — — — — 0x0 — — Write, Read — — — — Write, Read — — 1 0 Access Type VDD_OOR_EN: VDD Out-of-Range Indicator Enable VALUE ENUMERATION DECODE 0 OFF Disables the VDD_OVR interrupt 1 ON Enables the VDD_OVR interrupt ECG_RDY_EN: New ECG FIFO Data Ready Interrupt Enable VALUE ENUMERATION 0 OFF ECG_RDY interrupt is disabled DECODE 1 ON ECG_RDY interrupt is enabled FIFO Write Pointer (0x04) 7 6 5 Field BIT — — — 4 3 2 Reset — — — 0x00 Access Type — — — Write, Read FIFO_WR_PTR[4:0] FIFO_WR_PTR: FIFO Write Pointer This points to the location where the next sample is written. This pointer advances for each sample pushed on to the FIFO. www.maximintegrated.com Maxim Integrated │  22 MAX86150 Integrated Photoplethysmogram and Electrocardiogram Bio-Sensor Module For Mobile Health Overflow Counter (0x05) BIT 7 6 5 4 3 2 Field — — — OVF_COUNTER[4:0] Reset — — — 0x00 Access Type — — — Read Only 1 0 OVF_COUNTER: FIFO Overflow Counter When FIFO is full, any new samples result in new or old samples getting lost depending on FIFO_ROLLS_ON_FULL. OVF_COUNTER counts the number of samples lost. It saturates at 0x1F. FIFO Read Pointer (0x06) 7 6 5 Field BIT — — — 4 3 2 Reset — — — 0x00 Access Type — — — Write, Read 1 0 FIFO_RD_PTR[4:0] FIFO_RD_PTR: FIFO Read Pointer The FIFO Read Pointer points to the location from where the processor gets the next sample from the FIFO through the I2C interface. This advances each time a sample is popped from the FIFO. The processor can also write to this pointer after reading the samples. This allows rereading (or retrying) samples from the FIFO. www.maximintegrated.com Maxim Integrated │  23 MAX86150 Integrated Photoplethysmogram and Electrocardiogram Bio-Sensor Module For Mobile Health FIFO Data Register (0x07) BIT 7 6 5 4 3 Field FIFO_DATA[7:0] Reset 0x00 Access Type 2 1 0 Write, Read FIFO_DATA: FIFO Data Register This is a read-only register and is used to get data from the FIFO. See FIFO Description for more details. FIFO Configuration (0x08) BIT 7 6 5 4 3 2 1 Field — A_FULL_ CLR A_FULL_ TYPE FIFO_ ROLLS_ ON_FULL FIFO_A_FULL[3:0] Reset — 0x0 0x0 0x0 0xF Access Type — Write, Read Write, Read Write, Read Write, Read 0 A_FULL_CLR: FIFO Almost Full Interrupt Options This defines whether the A-FULL interrupt should get cleared by FIFO_DATA register read. VALUE ENUMERATION 0 RD_DATA_NOCLR 1 RD_DATA_CLR DECODE A_FULL interrupt does not get cleared by FIFO_DATA register read. It gets cleared by status register read. A_FULL interrupt gets cleared by FIFO_DATA register read or status register read. A_FULL_TYPE: FIFO Almost Full Flag Options This defines the behavior of the A_FULL interrupt. VALUE ENUMERATION DECODE 0 AFULL_RPT A_FULL interrupt gets asserted when the a_full condition is detected. It is cleared by status register read, but re-asserts for every sample if the a_full condition persists. 1 AFULL_ONCE www.maximintegrated.com A_FULL interrupt gets asserted only when the a_full condition is detected. The interrupt gets cleared on status register read, and does not re-assert for every sample until a new a-full condition is detected. Maxim Integrated │  24 MAX86150 Integrated Photoplethysmogram and Electrocardiogram Bio-Sensor Module For Mobile Health FIFO_ROLLS_ON_FULL: FIFO Rolls on Full Options This bit controls the behavior of the FIFO when the FIFO becomes completely filled with data. When the device is in PROX mode, the FIFO always rolls on full. ●● Push to FIFO is enabled when FIFO is full if FIFO_ROLLS_ON_FULL = 1 and old samples are lost. Both FIFO_ WR_PTR and FIFO_RD_PTR increment for each sample after the FIFO is full. ●● Push to FIFO is disabled when FIFO is full if FIFO_ROLLS_ON_FULL = 0 and new samples are lost. FIFO_WR_ PTR does not increment for each sample after the FIFO is full. VALUE ENUMERATION DECODE 0 OFF The FIFO stops on full. 1 ON The FIFO automatically rolls over on full. FIFO_A_FULL: FIFO Almost Full Value These bits indicate how many new samples can be written to the FIFO before the interrupt is asserted. For example, if set to 0xF, the interrupt triggers when there is 17 empty space left (15 data samples), and so on. FIFO_A_FULL FREE SPACE BEFORE INTERRUPT # OF SAMPLES IN FIFO 0000 0 32 0001 1 31 0010 2 30 0011 3 29 ---- ---- ---- 1110 14 18 1111 15 17 www.maximintegrated.com Maxim Integrated │  25 MAX86150 Integrated Photoplethysmogram and Electrocardiogram Bio-Sensor Module For Mobile Health FIFO Data Control Register 1 (0x09) BIT 7 6 5 4 3 2 1 Field FD2[3:0] FD1[3:0] Reset 0x0 0x0 Write, Read Write, Read Access Type 0 FD2: FIFO Data Time Slot 2 These bits set the data type for element 2 of the FIFO. The FIFO can hold up to 32 samples. Each sample can hold up to four elements and each element is 3 bytes wide. The data type that gets stored in the 3 bytes is configured by FD1, FD2, FD3 and FD4 according to the following table. For restriction on data type sequences, see the FIFO Description section. FD2[3:0] DATA TYPE FD2[3:0] DATA TYPE FD2[3:0] DATA TYPE FD2[3:0] DATA TYPE 0000 None 0100 Reserved 1000 Reserved 1100 Reserved 0001 PPG_LED1 0101 Pilot LED1 1001 ECG 1101 Reserved 0010 PPG_LED2 0110 Pilot LED2 1010 Reserved 1110 Reserved 0011 Reserved Reserved Reserved Reserved Reserved 1111 Reserved FD1: FIFO Data Time Slot 1 These bits set the data type for element 1 of the FIFO. The FIFO can hold up to 32 samples. Each sample can hold up to four elements and each element is 3 bytes wide. The data type that gets stored in the 3 bytes is configured by FD1, FD2, FD3 and FD4 according to the following table. For restriction on data type sequences, see the FIFO Description section. FD1[3:0] DATA TYPE FD1[3:0] DATA TYPE FD1[3:0] DATA TYPE FD1[3:0] DATA TYPE 0000 None 0001 PPG_LED1 0100 Reserved 1000 Reserved 1100 Reserved 0101 Pilot LED1 1001 ECG 1101 Reserved 0010 0011 PPG_LED2 0110 Pilot LED2 1010 Reserved 1110 Reserved Reserved 0111 Reserved 1011 Reserved 1111 Reserved www.maximintegrated.com Maxim Integrated │  26 MAX86150 Integrated Photoplethysmogram and Electrocardiogram Bio-Sensor Module For Mobile Health FIFO Data Control Register 2 (0x0A) BIT 7 6 5 4 3 2 1 Field FD4[3:0] FD3[3:0] Reset 0x0 0x0 Write, Read Write, Read Access Type 0 FD4: FIFO Data Time Slot 4 These bits set the data type for element 4 of the FIFO. The FIFO can hold up to 32 samples. Each sample can hold up to four elements and each element is 3 bytes wide. The data type that gets stored in the 3 bytes is configured by FD1, FD2, FD3 and FD4 according to the following table. For restriction on data type sequences, see the FIFO Description section. FD4[3:0] DATA TYPE FD4 DATA TYPE FD4 DATA TYPE FD4 DATA TYPE 0000 None 0100 Reserved 1000 Reserved 1100 Reserved 0001 PPG_LED1 0101 Pilot LED1 1001 ECG 1101 Reserved 0010 PPG_LED2 0110 Pilot LED2 1010 Reserved 1110 Reserved 0011 Reserved 0111 Reserved 1011 Reserved 1111 Reserved FD3: FIFO Data Time Slot 3 These bits set the data type for element 3 of the FIFO. The FIFO can hold up to 32 samples. Each sample can hold up to four elements and each element is 3 bytes wide. The data type that gets stored in the 3 bytes is configured by FD1, FD2, FD3 and FD4 according to the following table. For restriction on data type sequences please refer to the FIFO Description section. FD3[3:0] DATA TYPE FD3 DATA TYPE FD3 DATA TYPE FD3 DATA TYPE 0000 None 0100 Reserved 1000 Reserved 1100 Reserved 0001 PPG_LED1 0101 Pilot LED1 1001 ECG 1101 Reserved 0010 PPG_LED2 0110 Pilot LED2 1010 Reserved 1110 Reserved 0011 Reserved 0111 Reserved 1011 Reserved 1111 Reserved www.maximintegrated.com Maxim Integrated │  27 MAX86150 Integrated Photoplethysmogram and Electrocardiogram Bio-Sensor Module For Mobile Health System Control (0x0D) BIT 7 6 5 4 3 2 1 0 Field — — — — — FIFO_EN SHDN RESET Reset — — — — — 0x0 0x0 0x0 Access Type — — - — — Write, Read Write, Read Write, Read FIFO_EN: FIFO Enable VALUE ENUMERATION DECODE 0 OFF Push to FIFO is disabled, but the read and write pointers and the data in the FIFO are all held at their values before FIFO_EN is set to 0. 1 ON The FIFO is enabled. When this bit is set the FIFO is flushed of all old data and the new samples start loading from pointer zero. SHDN: Shutdown Control The part can be put into a power-save mode by setting this bit to one. While in power-save mode, all registers retain their values, and write/read operations function as normal. All interrupts are cleared to zero in this mode. VALUE ENUMERATION 0 OFF The part is in normal operation. No action taken. ON The part can be put into a power-save mode by writing a ‘1’ to this bit. While in this mode all registers remain accessible and retain their data. ADC conversion data contained in the registers are previous values. Writable registers also remain accessible in shutdown. All interrupts are cleared. In this mode the oscillator is shutdown and the part draws minimum current. If this bit is asserted during a active conversion then the conversion completes before the part shuts down. 1 DECODE RESET: Reset Control When this bit is set The part under-goes a forced power-on-reset sequence. All configuration, threshold and data registers including distributed registers are reset to their power-on-state. This bit then automatically becomes ‘0’ after the reset sequence is completed. VALUE ENUMERATION 0 OFF The part is in normal operation. No action taken. 1 ON The part under-goes a forced power-on-reset sequence. All configuration, threshold and data registers including distributed registers are reset to their power-on-state. This bit then automatically becomes ‘0’ after the reset sequence is completed. www.maximintegrated.com DECODE Maxim Integrated │  28 MAX86150 Integrated Photoplethysmogram and Electrocardiogram Bio-Sensor Module For Mobile Health PPG Configuration 1 (0x0E) BIT 7 6 5 4 3 2 1 0 Field PPG_ADC_RGE[1:0] PPG_SR[3:0] PPG_LED_PW[1:0] Reset 0x0 0x0 0x0 Write, Read Write, Read Write, Read Access Type PPG_ADC_RGE: SpO2 ADC Range Control These bits set the ADC range of the SPO2 sensor as shown in the table below. PPG_ADC_RGE LSB [pA] FULL SCALE [nA] 00 7.8125 4096 01 15.625 8192 10 31.25 16384 11 62.5 32768 PPG_SR: SpO2 Sample Rate Control SpO2 Sample Rate Control These bits set the effective sampling rate of the PPG sensor as shown in the table below. Note: If a sample rate is set that can not be supported by the selected pulse width and LED mode then the highest available sample rate will be automatically set. The user can read back this register to confirm the sample rate. PPG_SR SAMPLES PER SECOND PULSES PER SAMPLE, N 0000 10 1 0001 20 1 0010 50 1 0011 84 1 0100 100 1 0101 200 1 0110 400 1 0111 800 1 1000 1000 1 1001 1600 1 1010 3200 1 1011 10 2 1100 20 2 1101 50 2 1110 84 2 1111 100 2 www.maximintegrated.com Maxim Integrated │  29 MAX86150 Integrated Photoplethysmogram and Electrocardiogram Bio-Sensor Module For Mobile Health Maximum sample rates supported for all the pulse widths and number of LEDs: NUMBER OF ADC CONVERSIONS PER SAMPLE PPG_LED_PW = 0 (50µs) PPG_LED_PW = 1 (100µs) PPG_LED_PW = 2 (200µs) PPG_LED_PW = 3 (400µs) 1 LED, N=1 3200 1600 1000 1000 2 LED, N=1 1600 800 800 400 1 LED, N=2 100 100 100 100 2 LED, N=2 100 100 100 84 PPG_LED_PW: LED Pulse Width Control These bits set the pulse width of the LED drivers and the integration time of PPG ADC as shown in the table below. PPG_LED_PW PULSE WIDTH [µs] INTEGRATION TIME [µs] RES BITS 00 50 50 19 01 100 100 19 10 200 200 19 11 400 400 19 PPG Configuration 2 (0x0F) 7 6 5 4 3 Field BIT — — — — — 2 1 Reset — — — — — 0x0 Access Type — — — — — Write, Read 0 SMP_AVE[2:0] SMP_AVE: Sample Averaging Options To reduce the amount of data throughput, adjacent samples (in each individual channel) can be averaged and decimated on the chip by setting this register. These bits set the number of samples that are averaged on chip before being written to the FIFO. www.maximintegrated.com SMP_AVE[2:0] SAMPLE AVERAGE 000 1 (no averaging) 001 2 010 4 011 8 100 16 101 32 110 32 111 32 Maxim Integrated │  30 MAX86150 Integrated Photoplethysmogram and Electrocardiogram Bio-Sensor Module For Mobile Health Prox Interrupt Threshold (0x10) BIT 7 6 5 4 3 Field PROX_INT_THRESH[7:0] Reset 0x00 Access Type 2 1 0 Write, Read PROX_INT_THRESH: Proximity Mode Interrupt Threshold* This register sets the IR ADC count that triggers the beginning of the PPG mode specified in the FIFO Data Control Register. The threshold is defined as the 8 MSB bits of the ADC count. For example, if PROX_INT_THRESH[7:0] = 0x01, then an ADC value of 1023 (decimal) or higher triggers the PROX interrupt. If PROX_INT_THRESH[7:0] = 0xFF, then only a saturated ADC triggers the interrupt. LED1 PA (0x11) BIT 7 6 5 4 Field 3 2 1 0 LED1_PA[7:0] Reset 0x00 Access Type Write, Read LED1_PA: LED 1 (IR) Current Pulse Amplitude. These bits set the nominal current pulse amplitude of LED 1 as shown in the table below. LED1_RGE[1:0] 00 (50mA) 01 (100mA) LED1_PA[7:0] LED Current [mA] LED Current [mA] 00000000 0 0 00000001 0.2 0.4 00000010 0.4 0.8 00000011 0.6 1.2 11111100 50.4 100.8 11111101 50.6 101.2 11111110 50.8 101.6 11111111 51 102 LSB 0.2 0.4 ............ www.maximintegrated.com Maxim Integrated │  31 MAX86150 Integrated Photoplethysmogram and Electrocardiogram Bio-Sensor Module For Mobile Health LED2 PA (0x12) BIT 7 6 5 4 3 Field LED2_PA[7:0] Reset 0x00 Access Type 2 1 0 Write, Read LED2_PA: LED 2 (RED) Current Pulse Amplitude These bits set the nominal current pulse amplitude of LED 2 as shown in the table below. LED2_RGE[1:0] 00(50mA) 01(100mA) LED2_PA[7:0] LED Current[mA] LED Current[mA] 00000000 0 0 00000001 0.2 0.4 00000010 0.4 0.8 00000011 0.6 1.2 11111100 50.4 100.8 11111101 50.6 101.2 11111110 50.8 101.6 11111111 51 102 LSB 0.2 0.4 ............ LED Range (0x14) BIT 7 6 5 4 3 2 1 0 Field — — — — LED2_RGE[1:0] Reset — — — — 0x00 0x00 Access Type — — — — Write, Read Write, Read LED1_RGE[1:0] LED2_RGE: LED 2 Current Control Range selection of the LED current. Refer to LED2_PA[7:0] for more details. LED2_RGE LED CURRENT (mA) 00 50 01 100 10 Not Applicable 11 Not Applicable LED1_RGE: LED 1 Current Control Range selection of the LED current. Refer to LED1_PA[7:0] for more details. LED1_RGE LED CURRENT (mA) 00 50 01 100 10 Not Applicable 11 Not Applicable www.maximintegrated.com Maxim Integrated │  32 MAX86150 Integrated Photoplethysmogram and Electrocardiogram Bio-Sensor Module For Mobile Health LED PILOT PA (0x15) BIT 7 6 5 4 Field 3 2 1 0 PILOT_PA[7:0] Reset 0x00 Access Type Write, Read PILOT_PA: Proximity Mode LED Pulse Amplitude. The purpose of PILOT_PA[7:0] is to set the LED power during the PROX mode, as well as in Multi-LED mode. These bits set the current pulse amplitude for the pilot mode as shown in the table below. When LED x is used, the respective LEDx_RGE is used to control the range of the LED driver in conjunction with PILOT_PA[7:0]. For instance, if LED1 is used in the PILOT mode, then, LED1_RGE[1:0] together with PILOT_PA[7:0] will be used to set the LED1 current. LEDx_RGE[1:0] 00 (50mA) 01 (100mA) PILOT_PA[7:0] LED Current[mA] LED Current[mA] 00000000 0 0 00000001 0.2 0.4 00000010 0.4 0.8 00000011 0.6 1.2 11111100 50.4 100.8 11111101 50.6 101.2 11111110 50.8 101.6 11111111 51 102 LSB 0.2 0.4 ............ www.maximintegrated.com Maxim Integrated │  33 MAX86150 Integrated Photoplethysmogram and Electrocardiogram Bio-Sensor Module For Mobile Health ECG Configuration 1 (0x3C) BIT 7 6 5 4 3 2 1 0 Field — — — — — ECG_ADC_ CLK ECG_ADC_OSR[1:0] Reset — — — — — 0x0 0x0 Access Type — — — — — Write, Read Write, Read ECG_ADC_CLK: Please refer to ECG_ADC_OSR ECG_ADC_OSR: ECG ADC Oversampling Ratio These bit sets the over sampling ratio (OSR) of the ECG ADC. ECG_ADC_OSR together with the ADC clock frequency (ECG_ADC_CLK) set the ECG sample rate. The following table shows typical values only. {ECG_ADC_CLK, ECG_ADC_ OSR[1:0]} ECG SAMPLE RATE FILTER BANDWIDTH (70%) FILTER BANDWIDTH (90%) UNITS 000 1600 420 232 Hz 001 800 210 116 Hz 010 400 105 58 Hz 011 200 52 29 Hz 100 3200 840 464 Hz 101 1600 420 232 Hz 110 800 210 116 Hz 111 400 105 58 Hz www.maximintegrated.com Maxim Integrated │  34 MAX86150 Integrated Photoplethysmogram and Electrocardiogram Bio-Sensor Module For Mobile Health ECG Configuration 3 (0x3E) BIT 7 6 5 4 3 2 1 0 Field — — — — PGA_ECG_GAIN[1:0] IA_GAIN[1:0] Reset — — — — 0x0 0x2 Access Type — — — — Write, Read Write, Read PGA_ECG_GAIN: ECG PGA Gain Options These bit set the gain of the ECG PGA as shown below. PGA_ECG_GAIN GAIN UNITS 00 1 V/V 01 2 V/V 10 4 V/V 11 8 V/V IA_GAIN: Instrumentation Amplifier Gain Options These bit set the gain of the Instrumental Amplifier (IA) AFE as shown below. IA_GAIN GAIN UNITS 00 5 V/V 01 9.5 V/V 10 20 V/V 11 50 V/V Part ID (0xFF) BIT 7 6 5 Field Reset Access Type 4 3 2 1 0 PART_ID[7:0] 0x1E Read Only PART_ID: Part Identifier This register stores the Part identifier for the chip. www.maximintegrated.com Maxim Integrated │  35 MAX86150 Integrated Photoplethysmogram and Electrocardiogram Bio-Sensor Module For Mobile Health Applications Information Power Sequencing and Requirements Power-Up Sequencing It is recommended to power the VDD_ANA supply first, followed by the VDD_DIG and the LED power supplies (VLED). VDD_ANA and VDD_DIG can be powered on at the same time. The interrupt and I2C pins can be pulled up to an external voltage even when the power supplies are not powered up. After the power is established, an interrupt occurs to alert the system that the sensor is ready for operation. Reading the I2C interrupt register clears the interrupt, as shown in the Figure 3. Power-Down Sequencing The sensor is designed to be tolerant of any power-supply sequencing on power-down. I2C Interface The MAX86150 features an I2C/SMBus-compatible, 2-wire serial interface consisting of a serial data line (SDA) and a serial clock line (SCL). SDA and SCL facilitate communication between the MAX86150 and the master at clock rates up to 400kHz. The master generates SCL and initiates data transfer on the bus. The master device writes data to the MAX86150 by transmitting the proper slave address followed by data. Each transmit sequence is framed by a START (S) or REPEATED START (Sr) condition and a STOP (P) condition. Each word transmitted to the MAX86150 is 8 bits long and is followed by an acknowledge clock pulse. A master reading data from the MAX86150 transmits the proper slave address followed by a series of nine SCL pulses. The MAX86150 transmits data on SDA in sync with the master-generated SCL pulses. The master acknowledges receipt of each byte of data. Each read sequence is framed by a START (S) or REPEATED START (Sr) condition, a not acknowledge, and a STOP (P) condition. SDA operates as both an input and an open-drain output. A pullup resistor, typically greater than 1000Ω, is required on SDA. SCL operates only as an input. A pullup resistor, typically greater than 1000Ω, is required on SCL if there are multiple masters on the bus, or if the single master has an open-drain SCL output. Series resistors in line with SDA and SCL are optional. Series resistors protect the digital inputs of the MAX86150 from high-voltage spikes on the bus lines and minimize crosstalk and undershoot of the bus signals. VDD_ANA VDD_DIG VLED INT SDA, SCL PWR_RDY INTERRUPT HIGH (I/O PULLUP) READ TO CLEAR INTERRUPT HIGH (I/O PULLUP) Figure 3. Power-Up Sequence of the Power Supply Rails www.maximintegrated.com Maxim Integrated │  36 MAX86150 Integrated Photoplethysmogram and Electrocardiogram Bio-Sensor Module For Mobile Health Bit Transfer Slave Address One data bit is transferred during each SCL cycle. The data on SDA must remain stable during the high period of the SCL pulse. Changes in SDA while SCL is high are control signals. See the START and STOP Conditions section. A bus master initiates communication with a slave device by issuing a START condition followed by the 7-bit slave ID. When idle, the MAX86150 waits for a START condition followed by its slave ID. The serial interface compares each salve ID bit by bit, allowing the interface to power down and disconnect from SCL immediately if an incorrect slave ID is detected. After recognizing a START condition followed by the correct slave ID, the MAX86150 is programmed to accept or send data. The LSB of the slave ID word is the read/write (R/W) bit. R/W indicates whether the master is writing to or reading data from the MAX86150 (R/W = 0 selects a write condition, R/W = 1 selects a read condition). After receiving the proper slave ID, the MAX86150 issues an ACK by pulling SDA low for one clock cycle. START and STOP Conditions SDA and SCL idle high when the bus is not in use. A master initiates communication by issuing a START condition. A START condition is a high-to-low transition on SDA with SCL high. A STOP condition is a low-to-high transition on SDA while SCL is high . A START condition from the master signals the beginning of a transmission to the MAX86150. The master terminates transmission, and frees the bus, by issuing a STOP condition. The bus remains active if a REPEATED START condition is generated instead of a STOP condition. Figure 4 shows the START, STOP, and REPEATED START of the I2C conditions The MAX86150 slave ID consists of seven fixed bits, B7–B1 (set to 0b1011110). The most significant slave ID bit (B7) is transmitted first, followed by the remaining bits. Early STOP Conditions B7 B6 B5 B4 B3 B2 B1 B0 The MAX86150 recognizes a STOP condition at any point during data transmission except if the STOP condition occurs in the same high pulse as a START condition. For proper operation, do not send a STOP condition during the same SCL high pulse as the START condition. S 1 Sr 0 1 1 1 1 0 RW WRITE READ ADDRESS ADDRESS 0xBC 0xBD P SCL SDA Figure 4. START, STOP, and REPEATED START Conditions www.maximintegrated.com Maxim Integrated │  37 MAX86150 Integrated Photoplethysmogram and Electrocardiogram Bio-Sensor Module For Mobile Health Acknowledge read mode. An acknowledge is sent by the master after each read byte to allow data transfer to continue. A not acknowledge is sent when the master reads the final byte of data from the MAX86150, followed by a STOP condition. The acknowledge bit (ACK) as shown in Figure 5 is a clocked 9th bit that the MAX86150 uses to handshake receipt each byte of data when in write mode. The MAX86150 pulls down SDA during the entire mastergenerated 9th clock pulse if the previous byte is successfully received. Monitoring ACK allows for detection of unsuccessful data transfers. An unsuccessful data transfer occurs if a receiving device is busy or if a system fault has occurred. In the event of an unsuccessful data transfer, the bus master retries communication. The master pulls down SDA during the 9th clock cycle to acknowledge receipt of data when the MAX86150 is in Write Data Format For the write operation, send the slave ID as the first byte followed by the register address byte and then one or more data bytes. The register address pointer increments automatically after each byte of data received, so for example the entire register bank can be written by at one time. Terminate the data transfer with a STOP condition. The write operation is shown in the Figure 6. CLOCK PULSE FOR ACKNOWLEDMENT START CONDITION SCL 1 2 8 9 NOT ACKNOWLEDGE SDA ACKNOWLEDGE Figure 5. I2C Acknowledge S 1 1 0 1 1 1 0 R/W =0 ACK A7 D6 D5 D4 D3 A5 A4 A3 A2 A1 A0 ACK REGISTER ADDRESS SLAVE ID D7 A6 D2 D1 D0 ACK P DATA BYTE S = START CONDITION P= STOP CONDITION ACK = ACKNOWLEDGE BY THE RECEIVER INTERNAL ADDRESS POINTER AUTOINCREMENT(FOR WRITING MULTIPLE BYTES) Figure 6. Writing One Data Byte to MAX86150 www.maximintegrated.com Maxim Integrated │  38 MAX86150 Integrated Photoplethysmogram and Electrocardiogram Bio-Sensor Module For Mobile Health Read Data Format For the read operation, two I2C operations must be performed. First, the slave ID byte is sent followed by the I2C register that you wish to read. Then a REPEAT START (Sr) condition is sent, followed by the read slave ID. The MAX86150 then begins sending data beginning with the register selected in the first operation. The read pointer increments automatically, so the MAX86150 continues sending data from additional registers in sequential order until a STOP (P) condition is received. The exception to this is the FIFO_DATA register, at which the read pointer no longer increments when reading additional bytes. To read the next register after FIFO_DATA, an I2C write command is necessary to change the location of the read pointer. Figure 7 and Figure 8 show the process of reading one byte or multiple bytes of data respectively. An initial write operation is required to send the read register address. Data is sent from registers in sequential order, starting from the register selected in the initial I2C write operation. If the FIFO_DATA register is read, the read pointer does not automatically increment, and subsequent bytes of data contain the contents of the FIFO. Figure 7. Reading One Byte of Data from MAX86150 S 1 0 1 1 1 1 0 R/W =0 ACK A7 A6 A5 1 0 1 1 1 1 0 R/W =1 ACK D7 D6 D5 D6 D5 D4 D3 D2 D1 D0 AM D7 D6 A1 A0 ACK D4 D3 D2 D1 D0 AM D5 D4 D3 D2 D1 D0 NACK P DATA n DATA n-1 S = START CONDITION Sr = REPEATED START CONDITION P= STOP CONDITION A2 DATA 1 DATA BYTE D7 A3 REGISTER ADDRESS SLAVE ID Sr A4 ACK = ACKNOWLEDGE BY THE RECEIVER NACK = NOT ACKNOWLEDGE AM = ACKNOWLEDGE BY THE MASTER Figure 8. Reading Multiple Bytes of Data from the MAX86150 www.maximintegrated.com Maxim Integrated │  39 MAX86150 Integrated Photoplethysmogram and Electrocardiogram Bio-Sensor Module For Mobile Health FIFO Description Each sample comprises of up to four elements. The actual number of elements in a sample depends on: Overview ●● FIFO Data Control Register 1 The FLEX FIFO is designed to support configurable number of elements. So the number of elements in each sample is configurable. All elements are of same width, but can be interpreted differently, depending on how the FIFO data is configured. MS bits of any element that is smaller than this width is padded with zeroes. Reading FIFO through the I2C returns only the active FIFO data corresponding to the current configuration. ●● FIFO Data Control Register 2 FIFO Data Types FIFO Data Control Registers Table 1 shows the FIFO Data Control registers that are used for enabling any of the PPG modes (e.g., HR, SpO2, etc), ECG mode. The design is also scalable to support any: FD1, FD2, FD3, and FD4 (FDx[3:0]) are configured as shown in the Table 2 to hold data as programmed. It also shows the format of the data in the FIFO. ●● Element width in number of bits ●● Sample length in number of elements ●● FIFO depth in number of samples Table 1. FIFO Data Control registers ADDRESS REGISTER NAME HARDWIRED VALUE 0x09 FIFO Data Configuration Register 1 00 FD2[3:0] FD1[3:0] 0x0A FIFO Data Configuration Register 2 00 FD4[3:0] FDS3[3:0] B7 B6 B5 B4 B3 B2 B1 B0 Table 2. FDx Format Configurations FDX[3:0] DATA TYPE 0000 None N/A 0001 PPG PPG_DATA[18:0] for LED1 (IR) MS bits should be masked 0010 PPG PPG_DATA[18:0] for LED2 (Red) MS bits should be masked 0011 Reserved Reserved 0100 Reserved Reserved 0101 PPG PPG_DATA[18:0] for Pilot LED1 (IR) MS bits should be masked 0110 PPG PPG_DATA[18:0] for Pilot LED2 (Red) MS bits should be masked 0111 Reserved Reserved 1000 Reserved Reserved 1001 ECG ECG_DATA[17:0] 1010 Reserved Reserved 1011 Reserved Reserved 1100 Reserved Reserved 1101 Reserved Reserved 1110 Reserved Reserved 1111 Reserved Reserved www.maximintegrated.com FIFO CONTENT OR DATA DESCRIPTION NOTE MS bits padded with zeroes Maxim Integrated │  40 MAX86150 Integrated Photoplethysmogram and Electrocardiogram Bio-Sensor Module For Mobile Health If a configuration uses only one element, FD2, FD3, and FD4 are programmed as zeroes, and FD1 is programmed to the required data type. ●● If a configuration uses all four elements, FD1, FD2, FD3, and FD4 are programmed to the required data types. PPG data is left justified as shown in Table 3. In other words, the MSB bit is always in the bit 18 position regardless of ADC resolution setting, and the LSBs are padded with '0'. FIFO_DATA[23:19] are don't care and should be masked. ●● If a configuration uses only two elements, FD3 and FD4 are programmed as zeroes, and FD1 and FD2 are programmed to the required data types. ●● If a configuration uses only three elements, FD4 is programmed as zeroes, and FD1, FD2, and FD3 are programmed to the required data types. ECG Data is right justified, FIFO_DATA[23:18]are always padded with '0'. Table 3. FIFO Data Format​ FIFO_DATA FIFO_DATA[0] FIFO_DATA[1] FIFO_DATA[2] FIFO_DATA[3] FIFO_DATA[4] FIFO_DATA[5] FIFO_DATA[6] FIFO_DATA[7] FIFO_DATA[8] FIFO_DATA[9] FIFO_DATA[10] 0 BYTE 3 FIFO_DATA[11] x 0 FIFO_DATA[12] x 0 FIFO_DATA[13] FIFO_DATA[18] x 0 FIFO_DATA[14] FIFO_DATA[19] x 0 FIFO_DATA[15] FIFO_DATA[20] x 0 FIFO_DATA[16] FIFO_DATA[21] PPG (19-bit) ECG (18-bit) FIFO_DATA[17] ADC Resolution FIFO_DATA[22] BYTE 2 FIFO_DATA[23] BYTE 1 PPG elements are stored first, followed by ECG, as shown in the examples below: Example 1: Configurations for 3 elements: PPG (LED 1) + PPG (LED2) + ECG FD1[3:0] FD2[3:0] FD3[3:0] FD4[3:0] 0001 (PPG) 0010 (PPG) 1001 (ECG) 0000 (None) Example 2: Configurations for 2 elements: PPG (LED 2) + ECG FD1[3:0] FD2[3:0] FD3[3:0] FD4[3:0] 0010 (PPG) 1001 (ECG) 0000 (None) 0000 (None) Example 3: Configurations for 2 elements: PPG (LED 1) + PPG (LED2) FD1[3:0] FD2[3:0] FD3[3:0] FD4[3:0] 0001 (PPG) 0010 (PPG) 0000 (None) 0000 (None) Example 4: Configurations for 1 element: ECG FD1[3:0] FD2[3:0] FD3[3:0] FD4[3:0] 1001 (ECG) 0000 (None) 0000 (None) 0000 (None) Example 5: Configurations for 1 element: PPG (LED 1) FD1[3:0] FD2[3:0] FD3[3:0] FD4[3:0] 0001 (PPG) 0000 (None) 0000 (None) 0000 (None) www.maximintegrated.com Maxim Integrated │  41 MAX86150 Integrated Photoplethysmogram and Electrocardiogram Bio-Sensor Module For Mobile Health Table 4. Sample of FIFO Data Index INDEX WITHIN A SAMPLE the samples. This allows rereading (or retrying) samples from the FIFO. FIFO_DATA[23:0] 0 FD1 data, if enabled 1 FD2 data, if enabled 2 FD3 data, if enabled 3 FD4 data, if enabled FIFO Data Read, FIFO_DATA[7:0]: This is a read-only register and is used to get data from the FIFO. Reading FIFO_DATA register does not automatically increment the register address. So burst reading this register, reads the same address over and over. The length of a sample is determined by the number of active elements in the sample. Each element is three bytes long. In order to read one complete sample the FIFO_DATA register has to be read N times, where A sample in the FIFO is shown in Table 4. FIFO Handling Only the elements corresponding to the active FIFO data are pushed onto the FIFO, and only these are read through the I2C. The unused FIFO data are not read through the I2C, so they are don’t care and not padded with zeroes. The FIFO handling registers are shown in Table 5. Write Pointer to the FIFO, FIFO_WR_PTR[4:0]: This points to the location where the next sample will be written. This pointer advances for each sample pushed on to the FIFO. Read Pointer to the FIFO, FIFO_RD_PTR[4:0]: This points to the location from where the AP gets the next sample from the FIFO through the I2C interface. This advances each time a sample is popped from the FIFO. The AP can also write to this pointer after reading N = (Number of active elements) * (Number of bytes, 3) Reading from the FIFO Normally, reading registers from the I2C interface autoincrements the register address pointer, so that all the registers can be read in a burst read without an I2C restart event. In this case, this holds true for all registers except for the FIFO_DATA register (register 0x07). Reading the FIFO_DATA register does not automatically increment the register address. Burst reading this register reads data from the same address over and over. Each sample comprises multiple bytes of data, so multiple bytes should be read from this register (in the same transaction) to get one full sample. FIFO_RD_PTR advances only after burst reading the entire sample. Table 5. FIFO Handling Registers ADDRESS REGISTER NAME HARDWIRED VALUE 0x04 FIFO Write Pointer 00 FIFO_WR_PTR[4:0] 0x05 Overflow Counter 00 OVF_COUNTER[4:0] 0x06 FIFO Read Pointer 00 0x07 FIFO Data Register 00 0x08 FIFO Configuration 00 www.maximintegrated.com B7 B6 B5 B4 B3 B2 B1 B0 FIFO_RD_PTR[4:0] FIFO_DATA[7:0] A_FULL_ CLR A_FULL_ TYPE FIFO_ROLLS_ON_ FULL FIFO_A_FULL[3:0] Maxim Integrated │  42 MAX86150 Integrated Photoplethysmogram and Electrocardiogram Bio-Sensor Module For Mobile Health Each sample is read from the FIFO in the following order, when all four Elements are active (Table 6). Table 6. FIFO Sample Elements Order with four active elements FIFO_RD_PTR[4:0] n Sample: n+1 Sample: . . . . www.maximintegrated.com 1st read Element 1[23:16] n 2nd read Element 1[15:8] n 3rd read Element 1[7:0] n 4th read Element 2[23:16] n 5th read Element 2[15:8] n 6th read Element 2[7:0] n 7th read Element 3[23:16] n 8th read Element 3[15:8] n 9th read Element 3[7:0] n 10th read Element 4[23:16] n 11th read Element 4[15:8] n 12th read Element 4[7:0] n 13th read Element 1[23:16] n+1 14th read Element 1[15:8] n+1 15th read Element 1[7:0] n+1 16th read Element 2[23:16] n+1 17th read Element 2[15:8] n+1 18th read Element 2[7:0] n+1 19th read Element 3[23:16] n+1 20th read Element 3[15:8] n+1 21st read Element 3[7:0] n+1 22nd read Element 4[23:16] n+1 23rd read Element 4[15:8] n+1 24th read Element 4[7:0] n+1 . . . . . . . . . . . . Maxim Integrated │  43 MAX86150 Integrated Photoplethysmogram and Electrocardiogram Bio-Sensor Module For Mobile Health Each sample is read from the FIFO in the following order, when any two Elements are active (Table 7). Table 7. FIFO Sample Elements Order with two active elements FIFO_RD_PTR[4:0] n Sample: n+1 Sample: . . . . 1st read Element 1[23:16] n 2nd read Element 1[15:8] n 3rd read Element 1[7:0] n 4th read Element 2[23:16] n 5th read Element 2[15:8] n 6th read Element 2[7:0] n 7th read Element 1[23:16] n+1 8th read Element 1[15:8] n+1 9th read Element 1[7:0] n+1 10th read Element 2[23:16] n+1 11th read Element 2[15:8] n+1 12th read Element 2[7:0] n+1 . . . . Enable Push on FIFO FULL, FIFO_ROLLS_ON_FULL: This bit determines whether samples get pushed on to the FIFO when it is full. If push is enabled when FIFO is full, old samples are lost. Otherwise, new samples are lost. Overflow counter, OVF_COUNTER[4:0]: When the FIFO is full, samples are lost. OVF_COUNTER counts the number of samples lost. It saturates at 0x1F. When a complete sample is popped from the FIFO (when the read pointer advances), and OVF_COUNTER is reset to zero. FIFO Almost Full Counter, FIFO_AFULL_COUNT[3:0]: This determines the amount of space available in the FIFO, to declare that it is almost full. FIFO Almost Full status, and Interrupt Enable, A_FULL and MSK_A_FULL: When the FIFO is almost full, the almost full interrupt is asserted if it is enabled by the MSK_A_FULL bit. This prompts the AP to read some samples before the FIFO gets full. A_FULL bit is cleared when the status register is read. The AP reads the FIFO_WR_PTR and FIFO_RD_PTR to calculate the number of samples available in the FIFO, and read as many samples as it needs up to a maximum of available samples. The AP can then choose to write the new read pointer to the FIFO_RD_PTR register. If necessary to retry, the AP updates the FIF_RD_PTR register with appropriate value. www.maximintegrated.com . . . . . . . . Example: Following is an example of the pseudo code: First transaction: Get the FIFO_WR_PTR and FIFO_RD_ PTR: START; Send device address + write mode Send address of FIFO_WR_PTR; REPEATED_START; Send device address + read mode Read FIFO_WR_PTR; Read OVF_COUNTER; Read FIFO_RD_PTR; STOP; AP evaluates the number of samples to be read from the FIFO: If OVF_COUNTER is zero, NUM_AVAILABLE_SAMPLES = FIFO_WR_PTR – FIFO_RD_PTR (Note: pointer wrap around should be taken into account) If OVF_COUNTER is non-zero some samples are lost, and NUM_AVAILABLE_SAMPLES = 32 NUM_SAMPLES_TO_READ = < less than or equal to NUM_AVAILABLE_SAMPLES > Maxim Integrated │  44 MAX86150 Next transaction: Read NUM_SAMPLES_TO_READ samples from the FIFO: START; Send device address + write mode Send address of FIFO_DATA; REPEATED_START; Send device address + read mode for (i = 0; i < NUM_SAMPLES_TO_READ; i++) { Read FIFO_DATA; Save Data_Item1[23:16]; Read FIFO_DATA; Save Data_Item1[15:8]; Read FIFO_DATA; Save Data_Item1[7:0]; Read FIFO_DATA; Save Data_Item2[23:16]; Read FIFO_DATA; Save Data_Item2[15:8]; Read FIFO_DATA; Save Data_Item2[7:0]; Read FIFO_DATA; Save Data_Item3[23:16]; Read FIFO_DATA; Save Data_Item3[15:8]; Read FIFO_DATA; Save Data_Item3[7:0]; } STOP; Next transaction: Write to FIFO_RD_PTR register. If the pervious transaction was successful, FIFO_RD_PTR points to the next sample in the FIFO, and this transaction is not necessary. Otherwise, the AP updates the FIFO_ RD_PTR appropriately to New_FIFO_RD_PTR, so that the samples are reread. www.maximintegrated.com Integrated Photoplethysmogram and Electrocardiogram Bio-Sensor Module For Mobile Health START; Send device address + write mode Send address of FIFO_RD_PTR; Write New_FIFO_RD_PTR; STOP; FIFO Flush The FIFO gets flushed if FIFO_EN = 1, and if any of the following conditions are met: ●● I2C write to any of the PPG Configuration registers ●● I2C write to any of the ECG Configuration registers ●● I2C write to any of the FIFO Data Control registers ●● At the rising edge of FIFO_EN ●● Enter and exit PROX mode When the FIFO gets flushed, FIFO_WR_PTR and FIFO_ RD_PTR are reset to zero, and the contents of the FIFO are lost. If FIFO contents should not be lost, set FIFO_EN = 0, before writing to any of the registers listed above. Note: FIFO_EN bit is in the System Control register. Data is pushed to the FIFO, when FIFO_EN = 1. When FIFO_ EN = 0, push to FIFO is disabled, but it holds the status of the FIFO (FIFO pointers and the actual data). FIFO Organization Figure 9 shows how the samples are organized in the FIFO when all four elements in a sample are active. Figure 10 shows how the samples are organized in the FIFO when only two elements in a sample are active. Maxim Integrated │  45 MAX86150 Integrated Photoplethysmogram and Electrocardiogram Bio-Sensor Module For Mobile Health I2C BYTE 1 FIFO POINTERS[4:0] 0x00 0x01 0x02 0x1F I2C BYTE 2 I2C BYTE 3 23 ….……... 16, 15 ….….......... 8, 7 …...…....…. 0 RAM PHYSICAL ADDRESS[6:0] ELEMENT 1, SAMPLE N 0x00 ELEMENT 2, SAMPLE N 0x01 ELEMENT 3, SAMPLE N 0x02 ELEMENT 4, SAMPLE N 0x03 ELEMENT 1, SAMPLE N+1 0x04 ELEMENT 2, SAMPLE N+1 0x05 ELEMENT 3, SAMPLE N+1 0x06 ELEMENT 4, SAMPLE N+1 0x07 ELEMENT 1, SAMPLE N+2 0x08 ELEMENT 2, SAMPLE N+2 0x09 ELEMENT 3, SAMPLE N+2 0x0A ELEMENT 4, SAMPLE N+2 0x0B ELEMENT 1, SAMPLE N+31 0x7C ELEMENT 2, SAMPLE N+31 0x7D ELEMENT 3, SAMPLE N+31 0x7E ELEMENT 4, SAMPLE N+31 0x7F Figure 9. Example of FIFO Organization with Four Active Elements www.maximintegrated.com Maxim Integrated │  46 MAX86150 Integrated Photoplethysmogram and Electrocardiogram Bio-Sensor Module For Mobile Health I2C BYTE 1 FIFO POINTERS[4:0] 0x00 0x01 0x02 0x1F I2C BYTE 2 I2C BYTE 3 23 ….……... 16, 15 ….….......... 8, 7 …...…....…. 0 RAM PHYSICAL ADDRESS[6:0] ELEMENT 1, SAMPLE N 0x00 ELEMENT 2, SAMPLE N 0x01 NOT USED 0x02 NOT USED 0x03 ELEMENT 1, SAMPLE N+1 0x04 ELEMENT 2, SAMPLE N+1 0x05 NOT USED 0x06 NOT USED 0x07 ELEMENT 1, SAMPLE N+2 0x08 ELEMENT 2, SAMPLE N+2 0x09 NOT USED 0x0A NOT USED 0x0B ELEMENT 1, SAMPLE N+31 0x7C ELEMENT 2, SAMPLE N+31 0x7D NOT USED 0x7E NOT USED 0x7F Figure 10. Example of FIFO Organization with Two Active Elements MAX86150 Integrated Photoplethysmogram and Electrocardiogram Bio-Sensor Module For Mobile Health NC Typical Application Circuit NC NC 50kΩ Note 1 10pF 50kΩ NC ECG _N ECG _P 10pF NC INTB SDA HOST PROCESSOR SCL 22 21 2 20 3 19 4 18 5 6 MAX86150 17 16 7 15 8 14 9 13 10 11 12 C1_P C1_N 1μF VREF GND _ANA 1μF GND _DIG PGND VLED 3.3V VDD _ANA 1.8V VDD _DIG NC NC 1kΩ note 2 1kΩ note 2 1kΩ note 2 NC 1 D1.8V 0.1μF 10μF 0.1μF 4.7μF PGND 0.1μF GND_ANA 4.7μF GND _DIG VDDIO note 5 Note 3 D1.8V Note 1: The RC Circuits added to the ECG_P and ECG_N are for Current Limiting and RF/EMI filtering purposes. It’s value are system dependent. . Note 2: The value of I 2C and INTB pull up resistors should be based on the system design Note 3: We suggest dedicated 1.8V for VDD _ANA whenever possible, otherwise VDD_ANA is suggested to be isolated from other supplies, such as VDD_DIG. Note 4: Use common design practice to isolate noise coupling between GND planes . Note 5: VDDIO is the system I/O voltage supply. 1.8V 0 0 Note 4 Ordering Information PART TEMP RANGE PIN-PACKAGE MAX86150EFF+T -40°C to +85°C 22-Lead OESIP +Denotes a lead(Pb)-free/RoHS-compliant package. T = Tape-and-reel. www.maximintegrated.com Maxim Integrated │  48 MAX86150 Integrated Photoplethysmogram and Electrocardiogram Bio-Sensor Module For Mobile Health Revision History REVISION NUMBER REVISION DATE 0 12/15 Initial release 1 11/16 General updates and typo corrections 12/18 Updated the General Description, Benefits and Features, Absolute Maximum Ratings, Package Information, Electrical Characteristics, Pin Description, Detailed Description, LED Driver, and Electrocardiogram (ECG) sections; updated the Register Map and Interrupt Enable 1 (0x02), FIFO Data Control Register 1 (0x09), PPG Configuration (0x0E), Prox Interrupt threshold (0x10), LED Pilot PA (0x15), and ECG Configuration (0x3C) register tables; replaced all Typical Operating Characteristics; added ECG and PPG Synchronization section 2 PAGES CHANGED DESCRIPTION — 1–47 1–13, 15–20 22, 27, 30, 31 32, 34–35 For pricing, delivery, and ordering information, please visit Maxim Integrated’s online storefront at https://www.maximintegrated.com/en/storefront/storefront.html. Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance. Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc. © 2018 Maxim Integrated Products, Inc. │  49