TCS3471 参数 Datasheet PDF下载

TCS3471

COLOR LIGHT-TO-DIGITAL CONVERTER

TAOS115 − MARCH 2011

Functional Block Diagram

Wait Control

V

DD

RGBC Control

Clear

Red

Green

GND

Blue

Clear ADC

Red ADC

Green ADC

Blue ADC

Clear Data

Red Data

Green Data

Blue Data

Lower Limit

Upper Limit

I

2

C Interface

SCL

Interrupt

INT

SDA

Detailed Description

The TCS3471 light-to-digital device contains a 4

×

4 photodiode array, integrating amplifiers, ADCs,

accumulators, clocks, buffers, comparators, a state machine, and an I

2

C interface. The 4

×

4 photodiode array

is composed of red-filtered, green-filtered, blue-filtered, and clear photodiodes — four of each type. Four

integrating ADCs simultaneously convert the amplified photodiode currents to a digital value providing up to 16

bits of resolution. Upon completion of the conversion cycle, the conversion result is transferred to the data

registers. The transfers are double-buffered to ensure that the integrity of the data is maintained.

Communication to the device is accomplished through a fast (up to 400 kHz), two-wire I

2

C serial bus for easy

connection to a microcontroller or embedded controller.

The TCS3471 provides a separate pin for level-style interrupts. When interrupts are enabled and a pre-set value

is exceeded, the interrupt pin is asserted and remains asserted until cleared by the controlling firmware. The

interrupt feature simplifies and improves system efficiency by eliminating the need to poll a sensor for a light

intensity value. An interrupt is generated when the value of an RGBC conversion exceeds either an upper or

lower threshold. In addition, a programmable interrupt persistence feature allows the user to determine how

many consecutive exceeded thresholds are necessary to trigger an interrupt.

Terminal Functions

TERMINAL

NAME

GND

INT

NC

SCL

SDA

V

DD

NO.

3

5

4

2

6

1

I

I/O

O

TYPE

DESCRIPTION

Power supply ground. All voltages are referenced to GND.

Interrupt — open drain.

Do not connect

I

2

C serial clock input terminal — clock signal for I

2

C serial data.

I

2

C serial data I/O terminal — serial data I/O for I

2

C .

Supply voltage.

Copyright

E

2011, TAOS Inc.

r

r

The

LUMENOLOGY

r

Company

2

www.taosinc.com