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TCS3472 Datasheet(PDF) 3 Page - ams AG

Part # TCS3472
Description  COLOR LIGHT-TO-DIGITAL CONVERTER with IR FILTER
Download  27 Pages
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Manufacturer  AMSCO [ams AG]
Direct Link  http://www.ams.com
Logo AMSCO - ams AG

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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
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
IR-Blocking
Filter
Detailed Description
The TCS3472 light-to-digital converter contains a 3
× 4 photodiode array, four analog-to-digital converters
(ADC) that integrate the photodiode current, data registers, a state machine, and an I2C interface. The 3
× 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.
Communication of the TCS3472 data is accomplished over a fast, up to 400 kHz, two-wire I2C serial bus. The
industry standard I2C bus facilitates easy, direct connection to microcontrollers and embedded processors.
In addition to the I2C bus, the TCS3472 provides a separate interrupt signal output. When interrupts are
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.


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