ISL29018IROZ-EVALZ【PDF 1/19 页】EVALUATION BOARD FOR ISL29018

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Digital Ambient Light Sensor and Proximity Sensor with

Interrupt Function

ISL29018

The ISL29018 is an integrated ambient and infrared light to

digital converter with a built-in IR LED driver and I 2 C 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 ISL29018 supports both hardware and software interrupts

that remain asserted until the host clears it through I 2 C interface

for ambient light sensing and proximity detection.

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

ISL29018 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.

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

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 I 2 C)

- 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

? 90 μ A Max Operating Current

? Software Shutdown and Automatic Shutdown

- 0.5 μ A Max Shutdown Current

Easy to Use

? I 2 C (SMBus Compatible) Output

? No Complex Algorithms Needed

? Temperature Compensated

? Small Form Factor

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

Additional Features

? I 2 C and SMBus Compatible

? 1.7V to 3.63V Supply for I 2 C Interface

? 2.25V to 3.63V Sensor Power Supply

? Pb-Free (RoHS compliant)

October 8, 2012

FN6619.4

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

Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.

All other trademarks mentioned are the property of their respective owners.

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