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Features
D Digital Proximity Detector, LED Driver, and
IR LED in a Single Optical Module
TMD2671
DIGITAL PROXIMITY DETECTOR
TAOS144B ? SEPTEMBER 2012
PACKAGE
MODULE?8
(TOP VIEW)
D Proximity Detection
? 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
V DD 1
SCL 2
GND 3
LEDA 4
8 SDA
7 INT
6 LDR
5 LEDK
? Programmable Interrupt Function with
Upper and Lower Threshold
Package Drawing is Not to Scale
D
D
D
D
D
Programmable Wait Timer
? Wait State — 65 m A Typical Current
? Programmable from 2.72 ms
to > 8 Seconds
I 2 C Interface Compatible
? Up to 400 kHz (I 2 C Fast Mode)
Dedicated Interrupt Pin
3.94 mm y 2.36 mm y 1.35 mm Package
Sleep Mode — 2.5 m A Typical
Applications
D Cell Phone Touch Screen Disable
D Automatic Speakerphone Enable
D Automatic Menu Popup
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.
Communication with the device is accomplished with a simple 2-wire I 2 C interface with data rates up to 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 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
only 9.36 mm 2, which is far smaller than discrete solutions. Also, the package height is only 1.35 mm, which
makes the TMD2671 device suitable for very thin mechanical applications.
r
1001 Klein Road S Suite 300 S Plano, TX 75074 S (972) 673-0759
The LUMENOLOGY r Company
Texas Advanced Optoelectronic Solutions Inc.
r
www.taosinc.com
Copyright E 2012, TAOS Inc.
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