TSL2671

DIGITAL PROXIMITY DETECTOR

TAOS118 − JANUARY 2011

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The LUMENOLOGY

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Copyright

E 2011, TAOS Inc.

www.taosinc.com

Features

Driver in a Single Device

− Programmable Number of IR Pulses

− Programmable Current Sink for the IR

LED — No Limiting Resistor Needed

− Programmable Interrupt Function with

Upper and Lower Threshold

− Covers a 2000:1 Dynamic Range

− Programmable from 2.72 ms

to > 8 Seconds

− Wait State — 65

mA Typical Current

− Dedicated Interrupt Pin

Applications

Description

The TSL2671 family of devices provides a complete proximity detection system and digital interface logic in a

single 6-pin package. The device includes a digital proximity sensor with integrated LED driver for the required

external IR LED. The proximity function offers a wide range of performance, with four programmable LED drive

currents and a pulse repetition range of 1 to 32 pulses. The proximity detection circuitry compensates for

ambient light, allowing it to operate in environments ranging from bright sunlight to dark rooms. This wide

dynamic range also allows operation in short-distance detection applications behind dark glass, such as cell

phones. An internal state machine provides the ability to put the device into a low-power mode for very low

average power consumption.

The proximity function specifically targets near-field proximity applications. In cell phones, for example, the

proximity detection function can detect when the user positions the phone close to their ear. The device is fast

enough to provide proximity information at the 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.

400 kHz. 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 generated only upon a proximity event.

The TSL2671 is supplied in a very small form factor 2-mm

× 2-mm, 6-pin optical package, requiring very little

PCB area. Also, the package height is only 0.65 mm high, which makes the TSL2671 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 FN

DUAL FLAT NO-LEAD

(TOP VIEW)

SCL 2

GND 3

6 SDA

5 INT

4 LDR

Package Image Not Actual Size