TMD2672

DIGITAL PROXIMITY DETECTOR

TAOS149C − AUGUST 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

TMD2671 Series

− Reduced Proximity Count Variation

*

− Programmable Offset Control Register

*

− Saturation Indicator

*

− Programmable Integration Time and Offset

− Current Sink Driver for IR LED

− 16,000:1 Dynamic Range

− Programmable Upper and Lower

Thresholds with Persistence Filter

− Low Power 2.2

mA Sleep State with User-

Selectable Sleep-After-Interrupt Mode

*

− 90

mA Wait State with Programmable Wait

Time from 2.7 ms to > 8 seconds

− Data Rates up to 400 kbit/s

or 1.8-V Bus

Applications

Automatic Speakerphone Enable

End Products and Market Segments

HDTVs

Description

The TMD2672 family of devices provides a complete proximity detection system and digital interface logic in

a single 8-pin surface mount module. The devices are register-set and pin-compatible with the TMD2671 series

and includes new and improved proximity detection features. The proximity detection includes improved

signal-to-noise and accuracy. A proximity offset register allows compensation for optical system crosstalk

between the IR LED and the sensor. To prevent false proximity data measurement readings, a proximity

saturation indicator bit signals that the internal analog circuitry has reached saturation. Interrupts have been

enhanced with the addition of a sleep-on-interrupt feature that also allows for a single cycle operation. The

device internal state machine provides the ability to put the device in a low-power mode in between proximity

measurements, providing very low average power consumption.

The proximity detection system includes an LED driver and an IR LED, which are factory trimmed to eliminate

the need for end-equipment calibration due to component variations.

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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