SI1141(2011) View Datasheet(PDF) - Silicon Laboratories

Part Name

Description

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SI1141
(Rev.:2011)

PROXIMITY/AMBIENT LIGHT SENSOR IC WITH I2C INTERFACE

Silicon Laboratories 

Si1141/42/43

PROXIMITY/AMBIENT LIGHT SENSOR IC WITH I2C INTERFACE

Features

 QuickSense™ integrated infrared

Accurate lux measurements

proximity detector

possible with IR correction

Proximity detection adjustable from

algorithm

under 1 cm to over 1 m

25.6 µs measurement cycle keeps

Three independent LED drivers

total power consumption duty cycle

15 current settings from 5.6 mA to

low without compromising

360 mA for each LED driver

performance or noise immunity

25.6 µs LED driver pulse width  Industry's lowest power consumption

500 mm proximity range with single 1.8 to 3.6 V supply voltage

pulse (<2.5 klx)

9 µA average current (LED pulsed

150 mm proximity range with single

25.6 µs every 800 ms at 180 mA

pulse (>2.5 klx)

plus 3 µA Si114x supply)

Operates at up to 128 klx (direct

< 500 nA standby current

sunlight)

Internal and external wake support

Minimum reflectance sensitivity

Built-in voltage supply monitor and

< 1 µW/cm2

power-on reset controller

High EMI immunity without shielded  Serial communications

packaging

Up to 3.4 Mbps data rate

 QuickSense™ integrated ambient

Slave mode hardware address

light sensor

decoding

10 mlx resolution possible, allowing  Small-outline 10-lead 2x2 mm QFN

operation under dark glass

 Temperature Range

1 to 128 klx dynamic range possible –40 to +85 °C

across two ADC range settings

17-bit resolution

Applications

 Handsets

 E-book readers

 Notebooks/Netbooks

 Portable consumer electronics

 Audio products

 Security panels

 Tamper detection circuits

 Dispensers

Description

 Valve controls

 Smoke detectors

 Touchless switches

 Touchless sliders

 Occupancy sensors

 Consumer electronics

 Industrial automation

 Display backlighting control

 Photo-interrupters

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 1.8 to 3.6 V over the –40 to +85 °C

temperature range.

Pin Assignments

SDA

SCL

VDD

INT

DNC

10

1

9

2

8

QFN-10

3

7

4

6

5

NC

LED1

GND

LED3

LED2

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.

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