Si1143 2 Proximity/Ambient Light Sensor with I C Interface Description Features The Si1143 is a low-power, reflectance-based infrared proximity and ambient light sensor with I2C digital interface and programmable-threshold interrupt output. This device includes an integrated high-sensitivity photodiode, digital converter, digital signal processor, and three integrated infrared LED drivers with selectable drive levels. The Si1143 offers excellent performance under a wide dynamic range of light sources including direct sunlight. The photodiode response and associated digital conversion circuitry provide excellent immunity to artificial light flicker noise. The three infrared LED driver device is capable of supporting advanced infrared proximity motion detection. The Si1143 supports slave and autonomous modes of operation. QuickSenseTM Integrated Infrared Proximity Detector The device is provided in an 10-lead 2x2 mm QFN package and is capable of operation from 1.8 to 3.6 V over the -40 to +85 C temperature range. Handsets eReaders Notebooks/netbooks/tablet PCs Portable consumer electronics Audio products Security panels Tamper detection circuits Dispensers Valve controls Smoke detectors Touchless switches Occupancy sensors Consumer electronics Industrial automation Display backlighting control Photo-interrupter VDD - driver 25.6 s LED driver pulse width 500 mm proximity range with single pulse (<2.5 kLx) 150 mm proximity range with single pulse (>2.5 kLx) Operates at up to 128 klux (direct sunlight) Minimum reflectance sensitivity < 1 W/cm2 High EMI immunity without shielded packaging QuickSenseTM Integrated Ambient Light Sensor - 10 mlx resolution possible, allowing operation under dark glass - 1 to 128 klx dynamic range possible across two ADC range settings - 17-bit resolution - Accurate lux measurements possible with IR correction algorithm - 25.6 s measurement cycle keeps total power consumption Industry's Lowest Power Consumption - 1.8 to 3.6 V supply voltage - 9.7 A average dc current draw Assuming single PS channel, ALS Visible + ALS IR every 800 ms, 3 A average current for sensors and internal circuitry, and 6.7 A average current for external LED (assuming 209 mA for 25.6 s every 800 ms) < 20 nA powered down current - < 500 nA standby current - Internal and external wake support - Built-in voltage supply monitor and power-on reset controller Serial Communications - SMBus (I2C compatible) up to 3.4 Mbps data rate - Slave mode hardware address recognition Small-outline 10-Lead 2x2 mm QFN Package Temperature Range: -40 to +85 C LED1 Regulator Temp Visible INT - duty cycle low without compromising performance or noise immunity Applications - - Three independent LED drivers - Fifteen current settings from 6 mA to 416 mA for each LED Infrared A M U X LED Drivers ADC Human Interface Products LED3 Filter Digital Sequencer & Control Logic NC SCL SDA LED2 DNC 2 IC Register Map Oscillator GND Copyright (c) 2010 by Silicon Laboratories 11.19.10 Si1143 2 Proximity/Ambient Light Sensor with I C Interface Selected Electrical Specifications (TA = -40 to +85 C unless otherwise specified) Parameter Supply Voltage Conditions Min Typ Max Units -40 to +85 C, VDD to VSS 1.8 3.3 3.6 V -40 25 85 C Operating Temperature PS Operation under Direct Sunlight (Edc) VDD = 3.3 V -- -- 128 klx IDO Standby Mode VDD = 3.3 V -- -- 500 nA Min. Detectable Reflectance Input VDD = 3.3 V -- 0.1 1 W/cm2 10m -- 128k lx 100-1000 Lux -- -- 5 % 10-100 Lux -- -- 10 % 3-10 Lux -- -- 30 % ALS Dynamic Range ALS Linearity 10-Pin QFN Package 1 SCL 2 V DD 3 INT 4 QFN-10 9 LED1 8 GND 7 LED3 6 LED2 NC 5 SDA 10 DNC Pin Assignments (Preliminary) Note: Connect any unused LED drivers to V DD. Symbol A b D e E L aaa bbb ccc ddd Min 0.55 0.20 0.30 Millimeters Typ 0.65 0.25 2.00 BSC 0.50 BSC 2.00 BSC 0.35 0.10 0.10 0.08 0.10 Max 0.75 0.30 0.40 Product Family Part Number Pkg LED Drivers Range[<2.5 klx] Range[>2.5 klx] Supply Voltage Si1143-A10-GM QFN-10 3 500 mm 150 mm 1.8-3.6 V Human Interface Products Copyright (c) 2010 by Silicon Laboratories Silicon Laboratories and Silicon Labs are trademarks of Silicon Laboratories Inc. Other products or brandnames mentioned herein are trademarks or registered trademarks of their respective holders. 11.19.10