TCS3472

COLOR LIGHT-TO-DIGITAL CONVERTER

with IR FILTER

TAOS135 − AUGUST 2012

2

r

r

Copyright

E 2012, TAOS Inc.

The LUMENOLOGY

r Company

www.taosinc.com

Functional Block Diagram

SDA

INT

SCL

Wait Control

Clear ADC

Upper Limit

Lower Limit

Interrupt

GND

Red ADC

Green ADC

Blue ADC

Clear Data

Red Data

Green Data

Blue Data

RGBC Control

Blue

Green

Red

Clear

IR-Blocking

Filter

Detailed Description

The TCS3472 light-to-digital converter contains a 3

× 4 photodiode array, four analog-to-digital converters

× 4

photodiode array is composed of red-filtered, green-filtered, blue-filtered, and clear (unfiltered) photodiodes.

In addition, the photodiodes are coated with an IR-blocking filter. The four integrating ADCs simultaneously

convert the amplified photodiode currents to a 16-bit digital value. Upon completion of a conversion cycle, the

results are transferred to the data registers, which are double-buffered to ensure the integrity of the data. All

of the internal timing, as well as the low-power wait state, is controlled by the state machine.

enabled, and user-defined thresholds are exceeded, the active-low interrupt is asserted and remains asserted

until it is cleared by the controller. This interrupt feature simplifies and improves the efficiency of the system

software by eliminating the need to poll the TCS3472. The user can define the upper and lower interrupt

thresholds and apply an interrupt persistence filter. The interrupt persistence filter allows the user to define the

number of consecutive out-of-threshold events necessary before generating an interrupt. The interrupt output

is open-drain, so it can be wire-ORed with other devices.