Si1144-AAGX Data Short Optical Heart Rate Sensor Module with I2C Interface and HR Measurement Software The Si1144-AAGX is a low-power, reflectance-based, heart rate sensor. This optical heart rate sensor module includes an analogto-digital converter, integrated high-sensitivity photodiodes, host communications processor, a green high efficiency LED, and three integrated LED drivers with ninety selectable drive levels. The Si1144-AAGX offers excellent performance under a wide dynamic range and a variety of light sources from 525 nm to 940 nm. The Si1144-AAGX devices are provided in a 10-lead 4.9 x 2.85 x 1.2 mm LGA module package and are capable of operation from 1.71 to 3.6 V over the –40 to +85 °C temperature range. KEY FEATURES • Fully integrated heart rate sensor with ARM code library for extracting HR from the optical sensor data • Green LED with lens • High-sensitivity photodiode • Low-noise analog-to-digital converter and filtering • LED drivers • Optical blocking • Host communications and interrupts • Optional Movement compensation uses external accelerometer data • Accurate sensing of weak blood flow signals on the wrist • Three independent regulated LED drivers • Scalable from cost-sensitive single LED systems to high performance three LED systems Applications: • Fitness Bands • Smart Watches • Other Wearables • Healthcare • Programmable from 6 mA to 360 mA each • Integrated green LED ideal for wrist based heart rate applications • Add up to 2 external LEDs • Broad spectral sensitivity supports green through 940 nm LEDs • No additional optical blocking required • Low power consumption • 1.71 to 3.6 V supply voltage Sensor Die VDD Regulator Temp Visible Infrared LED1 A M U X ADC Filter LED Drivers LED3 LED2 LED1 • 25.6 μs LED “on” time keeps total power consumption duty cycle low without compromising performance or noise immunity LED3 • < 500 nA standby current LEDA LED2 • Built-in voltage supply monitor and power-on reset controller • I2C serial communications • Up to 3.4 Mbps data rate Digital Sequencer & Control Logic INT SCL SDA I2C Registers • Internal and external wake support Oscillator GND • Slave mode hardware address decoding (0x5A) • 10-lead 4.9 X 2.85 x 1.2 mm LGA Module package Si1144-AAGX Sensor Module Block Diagram silabs.com | Smart. Connected. Energy-friendly. • Temperature Range • –40 to +85 °C Rev. 0.9 Si1144-AAGX Data Short Si1144-AAGX Information 1. Si1144-AAGX Information Si1144-AAGX 4.9 x 2.85 x 1.3 mm LGA Module Application Schematic Table 1.1. Recommended Operating Conditions Parameter Symbol VDD Supply Voltage VDD OFF Supply Voltage Test Condition VDD VDD_OFF Min Typ Max Unit 1.71 — 3.6 V 1.0 V 50 mVpp OFF mode –0.3 VDD = 3.3 V — — T –40 25 85 °C SCL, SDA, Input High Logic Voltage I2CVIH VDD x 0.7 — VDD V SCL, SDA Input Low Logic I2CVIL 0 — VDD x 0.3 V l — 525 — nm VLED 4.1 — 5.0 V — — 250 mVpp — — 100 mVpp VDD Supply Ripple Voltage1 1 kHz–10 MHz Operating Temperature Voltage LED Emission Wavelength LED Supply Voltage LED Supply Ripple Voltage1 0–30 kHz 30 kHz–100 MHz Start-Up Time VDD above 1.71 V 25 — — ms LED3 Voltage Start-up VDD x 0.7 — — V 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-AAGX-GMR 4.9 x 2.85 x 1.2 mm LGA Module 3 LED drivers, 1 green LED integrated silabs.com | Smart. Connected. Energy-friendly. Rev. 0.9 | 1 Smart. Connected. Energy-Friendly Products Quality Support and Community www.silabs.com/products www.silabs.com/quality community.silabs.com Disclaimer Silicon Laboratories intends to provide customers with the latest, accurate, and in-depth documentation of all peripherals and modules available for system and software implementers using or intending to use the Silicon Laboratories products. Characterization data, available modules and peripherals, memory sizes and memory addresses refer to each specific device, and "Typical" parameters provided can and do vary in different applications. Application examples described herein are for illustrative purposes only. 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