Si1143-AAGX Data Short Optical Heart Rate Sensor Module with I2C Interface KEY FEATURES The Si1143-AAGX is a low-power, reflectance-based, heart rate sensor module with integrated 525 nm green LED, two additional LED driver outputs, I2C digital interface, and programmable-event interrupt output. This optical heart rate sensor module includes an analogto-digital converter, integrated high-sensitivity photodiodes, host communications processor, and three integrated LED drivers with fifteen selectable drive levels. The Si1143-AAGX offers excellent performance under a wide dynamic range and a variety of light sources from 525 nm to 940 nm. The Si1143-AAGX devices are provided in a 10- lead 4.9x2.85x1.2 mm QFN package and are capable of operation from 1.71 to 3.6 V over the –40 to +85 °C temperature range. • LED drivers • Optical blocking • Host communications and interrupts • Programmable from 6 mA to 360 mA each • Integrated green LED ideal for wrist based heart rate applications • Add up to 2 external LEDs Regulator Temp Visible Infrared LED1 A M U X ADC Filter LED Drivers LEDA LED1 LED3 LED2 LED3 LED2 Digital Sequencer & Control Logic INT SCL • Low-noise analog-to-digital converter and filtering • Three independent regulated LED drivers • Scalable from cost-sensitive single LED systems to high performance three LED systems Si1143 Optical Heart Rate Sensor SDA • High-sensitivity photodiode • Accurate sensing of weak blood flow signals on the wrist Applications: • Fitness Bands • Smart Watches • Other Wearables • Healthcare VDD • Fully integrated heart rate module IC • Green LED with lens I2C Registers Oscillator GND • 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 • 25.6 µs LED “on” time keeps total power consumption duty cycle low without compromising performance or noise immunity • < 500 nA standby current • Internal and external wake support Si1143-AAGX Sensor Module Block Diagram • Built-in voltage supply monitor and power-on reset controller • I2C serial communications • Up to 3.4 Mbps data rate • Slave mode hardware address decoding (0x5A) • 10-lead 4.9x2.85x1.2 mm LGA Module • Temperature Range • –40 to +85 °C silabs.com | Smart. Connected. Energy-friendly. Rev. 0.9 Si1143-AAGX Data Short Si1143-AAGX Information 1. Si1143-AAGX Information Si1143-AAGX Module Application Schematic with up to 3 LEDs and Separate LED Power Supply Table 1.1. Recommended Operating Conditions Parameter VDD Supply Voltage VDD OFF Supply Voltage Symbol 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 0.77 — — 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 Si1143-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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