TCS3471 Datasheet, PDF (3/23 Pages) TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS – COLOR LIGHT-TO-DIGITAL CONVERTER

TCS3471
COLOR LIGHT-TO-DIGITAL CONVERTER
TAOS115 − MARCH 2011
Functional Block Diagram
Wait Control
Interrupt
INT
V_DD
RGBC Control
Upper Limit
SCL
Clear ADC Clear Data
Clear
Lower Limit
Red ADC Red Data
Red
Green ADC Green Data
Green
SDA
lid ^GND
Blue ADC Blue Data
Blue
ill va 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
t _{is composed of red-filtered, green-filtered, blue-filtered, and clear photodiodes — four of each type. Four}
G _s 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
A ^{t 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
s ^{n 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
e _{is exceeded, the interrupt pin is asserted and remains asserted until cleared by the controlling firmware. The}
m ^{t 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
a ^{n 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.
co _{Terminal Functions}
l _TERMINAL
NAME NO.
a _GND
3
ic ^INT
5
NC
4
SCL
2
n _SDA
6
Tech ^VDD
1
TYPE
DESCRIPTION
Power supply ground. All voltages are referenced to GND.
O
Interrupt — open drain.
Do not connect
I
I²C serial clock input terminal — clock signal for I²C serial data.
I/O
I²C serial data I/O terminal — serial data I/O for I²C .
Supply voltage.
Copyright E 2011, TAOS Inc.
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www.taosinc.com
The LUMENOLOGY r Company
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