si1142 Silicon Laboratories, si1142 Datasheet

si1142

Manufacturer Part Number

si1142

Description

Proximity/ambient Light Sensor With I 2c Interface

Manufacturer

Silicon Laboratories

Datasheet

1.SI1142.pdf (2 pages)

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Description

The Si1142 is a low-power, reflectance-based

infrared proximity and ambient light sensor with I

digital

interrupt output. This device includes an integrated

high-sensitivity photodiode, digital converter, digital

signal processor, and two integrated infrared LED

drivers with selectable drive levels. The Si1142 offers

excellent performance under a wide dynamic range

of light sources including direct sunlight. The

photodiode

conversion circuitry provide excellent immunity to

artificial light flicker noise. The two infrared LED

driver device is capable of supporting advanced

proximity motion detection. The Si1142 supports

slave and autonomous modes of operation.

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.

Applications

- 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

Human Interface Products

interface

response

SDA

SCL

INT

and

Regulator

Temp

Infrared

Visible

and

programmable-threshold

associated

Proximity/Ambient Light Sensor with I

ADC

Digital Sequencer & Control Logic

digital

Features

QuickSense™ Integrated Infrared Proximity Detector

QuickSense™ Integrated Ambient Light Sensor

Industry's Lowest Power Consumption

Serial Communications

Small-outline 10-Lead 2x2 mm QFN Package

Temperature Range: –40 to +85 °C

Filter

Two independent LED drivers

Fifteen current settings from 6 mA to 416 mA for each LED

driver

25.6 µs 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 µW/cm

High EMI immunity without shielded packaging

10 mlx resolution possible, allowing operation under dark glass

1 to 128 klx dynamic range possible across two ADC range set-

tings

17-bit resolution

Accurate lux measurements possible with IR correction algo-

rithm

25.6 µs measurement cycle keeps total power consumption

duty cycle low without compromising performance or noise

immunity

1.8 to 3.6 V supply voltage

9.7 µA average dc current draw

Assuming single PS channel, ALS Visible + ALS IR every

800 ms,

3 µA average current for sensors and internal circuitry, and

6.7 µA average current for external LED (assuming 209 mA for

25.6 µs 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

SMBus (I

Slave mode hardware address recognition

C compatible) up to 3.4 Mbps data rate

Oscillator

Drivers

LED

LED2

GND

LED1

DNC

C Interface

Si1142

11.19.10

Related parts for si1142

si1142 Summary of contents

Page 1

... This device includes an integrated high-sensitivity photodiode, digital converter, digital signal processor, and two integrated infrared LED drivers with selectable drive levels. The Si1142 offers excellent performance under a wide dynamic range of light sources including direct sunlight. The photodiode response ...

Page 2

... QFN Package Symbol Min A 0. 0.30 aaa bbb ccc ddd Product Family LED Drivers Range[<2.5 klx] 2 500 mm Copyright © 2010 by Silicon Laboratories Si1142 2 C Interface Typ Max Units 3.3 3 °C — 128 klx — 500 nA 2 0.1 1 µW/cm — ...

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