TMD2771

DIGITAL ALS

and PROXIMITY MODULE

TAOS143B − SEPTEMBER 2012

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The LUMENOLOGY

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Copyright

E 2012, TAOS Inc.

www.taosinc.com

Features

Detection, and IR LED in a Single Optical

Module

− Approximates Human Eye Response

− Programmable Analog Gain

− Programmable Integration Time

− Programmable Interrupt Function with

Upper and Lower Threshold

− Up to 16 Bits Resolution

− Very High Sensitivity — Operates Behind

Darkened Glass

− Up to 1,000,000:1 Dynamic Range

− Calibrated to 100-mm Detection

− Eliminates Factory Calibration of Prox

− Programmable Number of IR Pulses

− Programmable Current Sink for the IR

LED — No Limiting Resistor Needed

− Programmable Interrupt Function with

Upper and Lower Threshold

− Wait State — 65

mA Typical Current

− Programmable from 2.72 ms

to > 8 Seconds

Applications

Description

The TMD2771 family of devices provides digital ambient light sensing (ALS), a complete proximity detection

system, and digital interface logic in a single 8-pin package. The proximity detector includes a digital proximity

sensor, LED driver, and IR LED, which are trimmed to eliminate the need for end-equipment calibration due to

component variations. Excellent background light rejection allows the device to operate in environments from

sunlight to dark rooms. The wide dynamic range allows for operation in short distance detection such as a cell

phone (behind dark glass). 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.

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 notebook PCs, LCD monitors,

flat-panel televisions, and cell phones.

The proximity function specifically targets near-field proximity 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. This provides both improved

green power saving capability and the added security to lock the computer when the user is not present. The

addition of the micro-optics lenses within the device, provide highly efficient transmission and reception of

infrared energy, which lowers overall power dissipation.

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Texas Advanced Optoelectronic Solutions Inc.

1001 Klein Road

S Suite 300 S Plano, TX 75074 S (972) 673-0759

PACKAGE

MODULE−8

(TOP VIEW)

SCL 2

GND 3

LEDA 4

8 SDA

7 INT

6 LDR

5 LEDK

Package Drawing is Not to Scale