ISL29011 View Datasheet(PDF) - Intersil

Part Name

Description

Manufacturer

ISL29011

Digital Ambient Light Sensor and Proximity Sensor with Interrupt Function

Intersil 

®

Data Sheet

February 4, 2010

ISL29011

FN6467.3

Digital Ambient Light Sensor and

Proximity Sensor with Interrupt Function

The ISL29011 is an integrated ambient and infrared light to

digital converter with a built-in IR LED driver and I2C Interface

(SMBus Compatible). This device provides not only ambient

light sensing to allow robust backlight/display brightness

control but also infrared sensing to allow proximity estimation

featured with interrupt function.

For ambient light sensing, an internal ADC has been

designed based on the charge-balancing A/D conversion

technique. The ADC conversion time is nominally 90ms and

is user adjustable from 11µs to 90ms, depending on

oscillator frequency and ADC resolution. This ADC is

capable of rejecting 50Hz and 60Hz flicker noise caused by

artificial light sources. The lux-range-select feature allows

users to program the lux range for optimized counts/lux.

For proximity sensing, the ADC is used to digitize the output

signal from the photodiode array when the internal IR LED

driver is turned on and off for the programmed time periods

under user-selected modulation frequency to drive the

external IR LED. As this proximity sensor employs a noise

cancellation scheme to highly reject unwanted IR noise, the

digital output of proximity sensing decreases with distance.

The driver output current is user selectable up to 100mA to

drive different types of IR emitters LEDs.

Six different modes of operation can be selected via the I2C

interface: Programmable ALS once with auto power-down,

programmable IR sensing once, programmable proximity

sensing once, programmable continuous ALS sensing,

programmable continuous IR sensing and programmable

continuous proximity sensing. The programmable one-time

operation modes greatly reduce power because an immediate

automatic shutdown reduces overall supply current less than

0.5µA.

The ISL29011 supports both hardware and software

interrupts that remain asserted until the host clears it through

I2C interface for ambient light sensing and proximity

detection.

Designed to operate on supplies from 2.25V to 3.63V, the

ISL29011 is specified for operation over the -40°C to +85°C

ambient temperature range. It is packaged in a clear, Pb-free

8 Ld ODFN package.

Features

Proximity Sensing

• Ambient IR Cancellation During Proximity Sensing

- Works Under Direct Sunlight

• IR LED Driver with Programmable Source Current

- Adjustable Current Drive from 100mA to 12.5mA

• Programmable LED current Modulation Frequency

• Variable Conversion Resolution

Ambient Light Sensing

• Simple Output Code Directly Proportional to lux

• Adjustable Sensitivity up to 65 Counts per lux

• Selectable Range (via I2C)

- Range 1 = 0.015 lux to 1,000 lux

- Range 2 = 0.06 lux to 4,000 lux

- Range 3 = 0.24 lux to 16,000 lux

- Range 4 = 0.96 lux to 64,000 lux

• Integrated 50/60Hz Noise Rejection

• Works Under Various Light Sources, Including Sunlight

Ideal Spectral Response for Light and Proximity Sensor

• Light Sensor Close to Human Eye Response

- Excellent Light Sensor IR and UV Rejection

• Proximity sensor range from 850nm to 950nm

- Can use either 850nm or 950nm LED solution

Ultra Low Power

• 90μA Max Operating Current

• Software Shutdown and Automatic Shutdown

- 0.5μA Max Shutdown Current

Easy to Use

• I2C (SMBus Compatible) Output

• No Complex Algorithms Needed

• Temperature Compensated

• Small Form Factor

- 8 Ld 2.0mmx2.1mmx0.7mm ODFN Package

Additional Features

• I2C and SMBus Compatible

• 1.7V to 3.63V Supply for I2C Interface

• 2.25V to 3.63V Sensor Power Supply

• Pb-Free (RoHS compliant)

Applications

• Display and Keypad Dimming Adjustment and Proximity

Sensing for:

- Mobile Devices: Smart Phone, PDA, GPS

- Computing Devices: Notebook PC, Webpad

- Consumer Devices: LCD-TV, Digital Picture Frame, Digital

Camera

• Industrial and Medical Light and Proximity Sensing

1

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

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