SI1142-A11-GM Silicon Labs

Si1141/42/43 2 PROXIMITY/AMBIENT LIGHT SENSOR IC WITH I C INTERFACE Features Pin Assignments Integrated infrared proximity detector Accurate lux measurements with IR Proximity detection adjustable from correction algorithm under 1 cm up to 200 cm Industry s lowest power consumption Three independent LED drivers 1.71 to 3.6 V supply voltage 15 current settings from 5.6 mA to 9 A average current (LED pulsed 360 mA for each LED driver 25.6 s every 800 ms at 180 mA 25.6 s LED driver pulse width plus 3 A Si114x supply) 50 cm proximity range with single < 500 nA standby current pulse (<3 klx) 25.6 s LED on time keeps total 15 cm proximity range with single power consumption duty cycle low pulse (>3 klx) without compromising performance Operates at up to 128 klx (direct or noise immunity sunlight) Internal and external wake support High reflectance sensitivity Built-in voltage supply monitor and 2 power-on reset controller < 1 W/cm Serial communications High EMI immunity without shielded Up to 3.4 Mbps data rate packaging Slave mode hardware address Integrated ambient light sensor decoding (0x5A) 100 mlx resolution possible, Small-outline 10-lead 2x2 mm QFN allowing operation under dark glass Temperature Range 1 to 128 klx dynamic range possible 40 to +85 C across two ADC range settings Applications Handsets Valve controls Heart rate monitoring Smoke detectors Pulse oximetry Touchless switches Wearables Touchless sliders Audio products Occupancy sensors Security panels Consumer electronics Tamper detection circuits Industrial automation Dispensers Display backlighting control Photo-interrupters Description The Si1141/42/43 is a low-power, reflectance-based, infrared proximity and ambient light sensor with I2C digital interface and programmable-event interrupt output. This touchless sensor IC includes an analog-to-digital converter, integrated high- sensitivity visible and infrared photodiodes, digital signal processor, and one, two, or three integrated infrared LED drivers with fifteen selectable drive levels. The Si1141/ 42/43 offers excellent performance under a wide dynamic range and a variety of light sources including direct sunlight. The Si1141/42/43 can also work under dark glass covers. The photodiode response and associated digital conversion circuitry provide excellent immunity to artificial light flicker noise and natural light flutter noise. With two or more LEDs, the Si1142/43 is capable of supporting multiple-axis proximity motion detection. The Si1141/42/43 devices are provided in a 10-lead 2x2 mm QFN package and are capable of operation from 1.71 to 3.6 V over the 40 to +85 C temperature range. Rev. 1.42 3/21 Copyright 2021 by Silicon Laboratories Si1141/42/43 Si1141/42/43 Functional Block Diagram Figure 1. Si1141 Basic Application Figure 2. Si1143 Application with Three LEDs and Separate LED Power Supply Note: For more application examples, refer to AN498: Si114x Designers Guide. 2 Rev. 1.42