MUX Si1144-A10 Data Short 2 Optical Heart Rate Sensor Chip with I C Interface and HR Measure- KEY FEATURES ment Software Library Sensor with ARM Cortex-M code The Si1144-A10 is a low-power, reflectance-based, heart rate sensor device combined with library for extracting HR a Cortex-M ARM code library containing the heart rate extraction algorithm. The heart rate Optional movement compensation algorithm provided in the library includes motion compensation using an external accelerom- uses external accelerometer data eter and is optimized to be accurate even in the difficult area of the wrist. Accurate sensing optimized for reading heart rate from the wrist 2 This optical heart rate sensor chip includes an I C digital interface, a programmable-event Integrated heart rate IC interrupt output, an analog-to-digital converter, integrated high sensitivity photodiodes, host High-sensitivity photodiode communications processor, and three integrated LED drivers capable of 6 to 360 mA output Low-noise analog-to-digital converter current. The Si1144-A10 offers excellent performance under a wide dynamic range and a and filtering variety of light sources from 525 nm to 940 nm. The Si1144-A10 devices are provided in a LED drivers 10-lead DFN package and are capable of operation from 1.71 to 3.6 V over the 40 to Host communications and interrupts +85C temperature range. Broad spectral sensitivity supports green through 940 nm LEDs Applications: Three independent regulated LED Fitness Bands drivers Smart Watches Scale cost-sensitive single LED systems to high performance three Other Wearables LED systems Healthcare Programmable from 6 to 360 mA each Low power consumption 1.71 to 3.6 V supply voltage Oscillator VDD Regulator Flexible duty cycle optimizes the power consumption. Photodiodes < 500 nA standby current LIGHT Internal and external wake support ADC LED1 LED . Built-in voltage supply monitor and Drivers . LED2 power-on reset controller (Currrent Temp Signal Sinks) LED3 * 2 Processor I C serial communications and Slave mode hardware address Control decoding (0x5A) Small outline 10-lead 2 mm x 2 mm INT DFN Temperature Range of 40 to +85 C SCL I2C Engine SDA * Pull up to VDD with 47 kOhm resistor Si1144-A10 Sensor Block Diagram silabs.com Smart. Connected. Energy-friendly. Rev. 0.9 Not Recommended for New DesignsSi1144-A10 Data Short Si1144-A10 Information 1. Si1144-A10 Information Si1144-A10 2 mm x 2 mm DFN Application Schematic Table 1.1. Recommended Operating Conditions Parameter Symbol Test Condition Min Typ Max Unit V Supply Voltage V 1.71 3.6 V DD DD V OFF Supply Voltage V OFF mode 0.3 1.0 V DD DD OFF 1 V = 3.3 V V Supply Ripple Voltage DD DD 50 mVpp 1 kHz10 MHz Operating Temperature T 40 25 85 C 2 SCL, SDA, Input High Logic Voltage V x 0.7 V V I C DD DD VIH 2 SCL, SDA Input Low Logic Voltage 0 V x 0.3 V I C DD VIL LED Emission Wavelength l 525 nm LED Supply Voltage VLED 4.1 5.0 V 1 030 kHz 250 mVpp LED Supply Ripple Voltage 30 kHz100 MHz 100 mVpp Start-Up Time V above 1.71 V 25 ms DD LED3 Voltage Start-up V x 0.7 V DD Note: 1. Supply voltage ripple sensitivity depends on the voltage at the LEDx pins when turned on. Table 1.2. Ordering Guide Part Number Package LED Drivers Si1144-A10-GMR 2 mm x 2 mm DFN 3 LED drivers silabs.com Smart. Connected. Energy-friendly. Rev. 0.9 1 Not Recommended for New Designs