SI1145-A10-GM Silicon Labs

Si1145/46/47 2 PROXIMITY/UV/AMBIENT LIGHT SENSOR IC WITH I C INTERFACE Features Pin Assignments Integrated infrared proximity detector Integrated UV index sensor Proximity detection adjustable from Industry s lowest power consumption under 1 cm to over 50 cm 1.71 to 3.6 V supply voltage Three independent LED drivers 9 A average current (LED pulsed 15 current settings from 5.6 mA to 25.6 s every 800 ms at 180 mA 360 mA for each LED driver plus 3 A Si114x supply) 25.6 s LED driver pulse width < 500 nA standby current 50 cm proximity range with single Internal and external wake support pulse (<3 klx) Built-in voltage supply monitor and 15 cm proximity range with single power-on reset controller pulse (>3 klx) 25.6 s LED on time keeps total Operates at up to 128 klx (direct power consumption duty cycle low sunlight) without compromising performance High reflectance sensitivity or noise immunity 2 2 < 1 W/cm I C Serial communications High EMI immunity without shielded Up to 3.4 Mbps data rate packaging Slave mode hardware address Integrated ambient light sensor decoding 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 Accurate lux measurements with IR correction algorithm Applications Handsets Valve controls E-book readers Smoke detectors Notebooks/Netbooks Touchless switches Portable consumer electronics Touchless sliders Audio products Occupancy sensors Security panels Consumer electronics Tamper detection circuits Industrial automation Dispensers Display backlighting control Photo-interrupters Description The Si1145/46/47 is a low-power, reflectance-based, infrared proximity, ultraviolet 2 (UV) index, and ambient light sensor with I C 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 Si1145/46/47 offers excellent performance under a wide dynamic range and a variety of light sources including direct sunlight. The Si1145/46/ 47 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 Si1146/47 is capable of supporting multiple-axis proximity motion detection. The Si1145/46/47 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. 1.4 4/20 Copyright 2020 by Silicon Laboratories Si1145/46/47 Not Recommended for New Designs Si1145/46/47 Functional Block Diagram Figure 1. Si1145 Basic Application Figure 2. Si1147 Application with Three LEDs and Separate LED Power Supply Note: For more application examples, refer to AN498: irLED Selection Guide for Si114x Proximity Applications. 2 Rev. 1.4 Not Recommended for New Designs