TSL27711 datasheet(2/51 Pages) OSRAM

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[v1-00] 2016-Mar-22

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TSL2771

Light-to-Digital Converter with

Proximity Sensing

The TSL2771 family of devices provides both ambient light

sensing (ALS) and proximity detection (when coupled with an

external IR LED). The ALS approximates human eye response to

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 ALS and proximity

measurements providing very low average power

consumption.

While useful for general purpose light sensing, the device is

particularly useful for display management with the purpose of

extending battery life and providing optimum viewing in

diverse lighting conditions. Display panel and keyboard

backlighting can account for up to 30 to 40 percent of total

platform power. The ALS features are ideal for use in tablets,

notebook PCs, LCD monitors, flat-panel televisions, and cell

phones.

The proximity function is targeted specifically towards cell

phone, 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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