ams Datasheet Page 1

[v1-21] 2016-Feb-16 Document Feedback

TMD2772/

TMD2772WA

Digital ALS and Proximity Module

The TMD2772/TMD2772WA family of devices provides digital

ambient light sensing (ALS), 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 TMD2771 family of devices and include new and

improved ALS and proximity detection features and are

available with 25° and 50° fields of view. The ALS enhancements

include a reduced-gain mode that extends the operating range

in sunlight. Proximity detection includes improved

signal-to-noise performance and more accurate factory

calibration. 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.

The TMD2772/TMD2772WA ALS is based on the ams patented

dual-diode technology that enables accurate results and

approximates human eye response to light intensity under a

variety of lighting conditions. 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.

Ordering Information and Content Guide appear at end of

datasheet.

Key Benefits & Features

The benefits and features of TMD2772/TMD2772WA, Digital ALS

and Proximity Module are listed below:

Figure 1:

Added Value of Using TMD2772/TMD2772WA

Benefits Features

• Minimizes board space requirements

• Ambient light sensing, proximity detection, and IR LED

in a single module

• Approximates human eye response over a

wide variety of lighting conditions. Achieves

accurate sensing behind spectrally dark glass.

• Ambient light sensing (ALS)

• Wide variety of programmable features which

enable 8,000,000:1 dynamic range with very high

sensitivity

General Description

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TMD2772/ TMD2772WA − General Description

Note(s):

1. New or Improved feature.

Applications

The TMD2772 applications include:

• Display Backlight Control

• Cell Phone Touch Screen Disable

• Mechanical Switch Replacement

• Industrial Process Control

• Medical Diagnostics

• Printer Paper Alignment

• Eliminates need for customer end-product

calibration.

• Reduces the proximity noise

• Control of system crosstalk and offset

• Prevents false proximity detection in bright

light

• Selectable IR power-level without external

resistor

• Enables wide operating range

• Proximity detection

• Calibrated and trimmed to provide consistent

reading

• Reduced proximity count variation

(1)

• Programmable offset

(1)

• Saturation indicator bit

(1)

•Programmable driver for IR LED

• 16,000:1 dynamic range

• Reduces external processor burden

• Maskable ALS and proximity interrupt

• Programmable upper and lower thresholds with

persistence filter

• Enables dynamic power dissipation control

• Power management

• Programmable average power consumption

• Programmable wait time from 2.7 ms to > 8

seconds

• Industry standard two-wire interface

• I²C fast mode compatible interface

• Data rates up to 400 kbit/s

• Input voltage levels compatible with V

or 1.8V

bus

• Small foot-print module • 3.94 mm x 2.36 mm x 1.35 mm package

• Optimize ambient light sensing angle

• Available with standard 25° (TMD2772) and wide 50°

(TMD2772WA)

Benefits Features

ams Datasheet Page 3

[v1-21] 2016-Feb-16 Document Feedback

TMD2772/ TMD2772WA − General Description

Block Diagram

The functional blocks of this device are shown below:

Figure 2:

TMD2772/TMD2772WA Block Diagram

Control

Programmable

Current Sink

I²C Interface

CH0

CH0 ADC

CH1 ADC

INT

SCL

SDA

LEDA LEDK LDR

CH1

LED

TMD2772/TMD2772WA