SI1143

Si 11 4 1 / 4 2 /43 P R O X I M I T Y /A M BI E N T L I G H T S E N S O R I C W I T H I 2 C I N T E R F A C E Features Pin Assignments  QuickSense™ integrated infrared proximity detector Proximity detection adjustable from under 1 cm to over 1 m Three independent LED drivers 15 current settings from 5.6 mA to 360 mA for each LED driver 25.6 µs LED driver pulse width  500 mm proximity range with single pulse (2.5 klx) Operates at up to 128 klx (direct sunlight) Minimum reflectance sensitivity < 1 µW/cm2 High EMI immunity without shielded  packaging  QuickSense™ 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 µs measurement cycle keeps total power consumption duty cycle low without compromising performance or noise immunity Industry's lowest power consumption 1.8 to 3.6 V supply voltage 9 µA average current (LED pulsed 25.6 µs every 800 ms at 180 mA plus 3 µA Si114x supply) < 500 nA standby current Internal and external wake support Built-in voltage supply monitor and power-on reset controller Serial communications Up to 3.4 Mbps data rate Slave mode hardware address decoding Small-outline 10-lead 2x2 mm QFN Temperature Range –40 to +85 °C DNC SDA SCL VDD INT 1 2 3 4 10 9 8 7 6 LED1 GND LED3 LED2 QFN-10 5 NC Applications         Handsets E-book readers Notebooks/Netbooks Portable consumer electronics Audio products Security panels Tamper detection circuits Dispensers          Valve controls Smoke detectors Touchless switches Touchless sliders Occupancy sensors Consumer electronics Industrial automation 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 highsensitivity 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 1.8 to 3.6 V over the –40 to +85 °C temperature range. Preliminary Rev. 0.5 1/11 Copyright © 2011 by Silicon Laboratories Si1141/42/43 This information applies to a product under development. Its characteristics and specifications are subject to change without notice. S i1141/42/43 Functional Block Diagram VDD Regulator Temp A M U X LED Drivers ADC Filter LED1 LED2 1 LED3 2 Visible INT SCL SDA Infrared Digital Sequencer & Control Logic I2C Registers Oscillator GND 1. Si1142 and Si1143 only. 2. Si1143 only. 3.3 V 30 ohm 5%, 1/16 W Host SDA SCL Si1141 SDA SCL VDD INT 0.1 uF INT LED1 GND CVDD CVDD 15 µF, 20%, >6 V Figure 1. Si1141 Basic Application 3.3 V 4.3 V No Pop Host Si1143 SDA SCL VDD INT 0.1 uF LED1 GND LED3 LED2 30 ohm 5%, 1/16 W 22 uF, 20%, >6V Figure 2. Si1143 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 Preliminary Rev. 0.5 S i1141/42/43 TABLE O F C ONTENTS Section Page 1. Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 2. Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 2.1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 2.2. Proximity Sensing (PS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 2.3. Ambient Light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10 2.4. Host Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 3. Operational Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 3.1. Off Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 3.2. Initialization Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 3.3. Standby Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 3.4. Forced Conversion Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14 3.5. Autonomous Operation Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15 4. Programming Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 4.1. Command and Response Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 4.2. Command Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 4.3. Resource Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 4.4. Signal Path Software Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 4.5. I2C Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25 4.6. Parameter RAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45 5. Pin Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60 6. Ordering Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61 7. Package Outline: 10-Pin QFN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62 Document Change List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .64 Contact Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .66 Preliminary Rev. 0.5 3 S i1141/42/43 1. Electrical Specifications Table 1. Recommended Operating Conditions Parameter VDD Supply Voltage VDD OFF Supply Voltage VDD Supply Ripple Voltage Operating Temperature SCL, SDA, Input High Logic Voltage SCL, SDA Input Low Logic Voltage PS Operation under Direct Sunlight IrLED Emission Wavelength IrLED Supply Voltage T I2CVIH I2CVIL Edc l VLED IrLED VF = 1.0 V nominal Applies if IrLEDs use separate supply rail 0–30 kHz 30 kHz–100 MHz VDD above 1.8 V Start-up Symbol VDD VDD_OFF Conditions includes ripple OFF mode VDD = 3.3 V 1 kHz–10 MHz Min 1.8 –0.3 — –40 VDDx0.7 0 — 750 VDD 50 25 — — — 850 — Typ 3.3 Max 3.6 1.0 TBD 85 VDD VDDx0.3 128 950 4.3 Units V V mVpp °C V V klx nm V IrLED Supply Ripple Voltage — — 20 VDDx0.77 250 100 — — TBD TBD — — mVpp mVpp ms V Start-Up Time LED3 Voltage Table 2. Absolute Maximum Ratings Parameter VDD Supply Voltage Operating Temperature Storage Temperature LED1, LED2, LED3 Voltage INT, SCL, SDA Voltage Maximum total current through LED1, LED2 and LED3 Maximum total current through GND ESD Rating Human Body Model at VDD = 0 V, TA < 85 °C at VDD = 0 V, TA < 85 °C Conditions Min –0.3 –40 –65 –0.5 –0.5 — — — Typ — — — — — — — — Max 4 85 85 3.6 3.6 500 600 2 Units V °C °C V V mA mA kV 4 Preliminary Rev. 0.5 S i1141/42/43 Table 3. Performance Characteristics1 Parameter IDD OFF Mode Symbol Ioff Conditions VDD < VDD_OFF (leakage from SCL, SDA, and INT not included) No ALS / PS Conversions No I2C Activity after t > TBD µs, VDD = 1.8 V No ALS / PS Conversions No I2C Activity after t > TBD µs, VDD =3.3 V Without LED influence, VDD = 3.3 V VDD = 3.3 V 1.8< VDD