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TCS3471 Datasheet(PDF) 2 Page - TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS

Part # TCS3471
Description  COLOR LIGHT-TO-DIGITAL CONVERTER
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Manufacturer  TAOS [TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS]
Direct Link  http://www.taosinc.com
Logo TAOS - TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS

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TCS3471
COLOR LIGHT-TO-DIGITAL CONVERTER
TAOS115 − MARCH 2011
2
r
r
Copyright
E 2011, TAOS Inc.
The LUMENOLOGY
r Company
www.taosinc.com
Functional Block Diagram
SDA
VDD
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
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 I2C 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 I2C 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
TYPE
DESCRIPTION
NAME
NO.
TYPE
DESCRIPTION
GND
3
Power supply ground. All voltages are referenced to GND.
INT
5
O
Interrupt — open drain.
NC
4
Do not connect
SCL
2
I
I2C serial clock input terminal — clock signal for I2C serial data.
SDA
6
I/O
I2C serial data I/O terminal — serial data I/O for I2C .
VDD
1
Supply voltage.


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