TCS3771 datasheet(2/49 Pages) OSRAM

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[v1-31] 2018-Apr-04

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TCS3771

Color Light-To-Digital Converter with

Proximity Sensing

The TCS3771 family of devices provides red, green, blue, and

clear (RGBC) light sensing and proximity detection (when

coupled with an external IR LED). They detect light intensity

under a variety of lighting conditions and through a variety of

attenuation materials. The proximity detection feature allows a

large dynamic range of operation for use in short distance

detection behind dark glass such as in a cell phone or for longer

distance measurements for applications such as presence

detection for monitors or laptops. The programmable proximity

detection enables continuous measurements across the entire

range. In addition, an internal state machine provides the ability

to put the device into a low power mode in between RGBC and

proximity measurements providing very low average power

consumption.

The TCS3771 is directly useful in lighting conditions containing

minimal IR content such as LED RGB backlight control, reflected

LED color sampler, or fluorescent light color temperature

detector. With the addition of an IR blocking filter, the device is

an excellent ambient light sensor, color temperature monitor,

and general purpose color sensor.

The proximity function is targeted specifically towards

battery-powered mobile devices, LCD monitor, laptop, and

flat-panel television applications. In cell phones, the proximity

detection can detect when the user positions the phone close

to their ear. The device is fast enough to provide proximity

information at a high repetition rate needed when answering

a phone call. It can also detect both close and far distances so

the application can implement more complex algorithms to

provide a more robust interface. In laptop or monitor

applications, the product is sensitive enough to determine

whether a user is in front of the laptop using the keyboard or

away from the desk. This provides both improved green power

saving capability and the added security to lock the computer

when the user is not present.

Ordering Information and Content Guide appear at end of

datasheet.

General Description

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