TMD2671

DIGITAL PROXIMITY DETECTOR

TAOS144B − SEPTEMBER 2012

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The LUMENOLOGY

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Copyright

E 2012, TAOS Inc.

www.taosinc.com

Features

IR LED in a Single Optical Module

− Calibrated to 100-mm Detection

− Integrated IR LED and Synchronous LED

Driver

− 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 TMD2671 family of devices provides a complete proximity detection system and digital interface logic in

a single 8-pin package. The proximity detector includes a digital proximity sensor with integrated LED driver,

and IR LED. The proximity function is calibrated to 100 mm (without cover glass), thus eliminating the need for

end-equipment or sub-assembly factory calibration. The proximity detection feature operates from sunlight to

dark rooms. The wide dynamic range also allows for operation in short distance detection behind dark glass

such as with a cell phone. An internal state machine provides the ability to put the device into a low-power mode

providing very low average power consumption. The addition of the micro-optics lenses within the module

provide highly efficient transmission and reception of infrared energy, which lowers overall power dissipation

for the detection function.

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 screen when the user may accidently deploy

a touch.

An interrupt output pin is provided for connection to the host processor. This interrupt pin can be used to

eliminate the need to poll the device on a repetitive basis. There is also a digital filter that compares the proximity

ADC results to programmed values so that an interrupt is only generated upon a proximity event.

The TMD2671 is packaged in a very small form factor 8-pin optical package. The PCB board area required is

makes the TMD2671 device suitable for very thin mechanical applications.

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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