TCS3404_11 Datasheet, PDF (3/41 Pages) ams AG – DIGITAL COLOR SENSORS

TCS3404, TCS3414
DIGITAL COLOR SENSORS
TAOS137A − APRIL 2011
A synchronization input (SYNC) provides precise external control of sensor integration allowing the internal
conversion cycles to be synchronized to a pulsed light source. Furthermore, the synchronization feature
supports the following advanced modes of operation to maximize flexibility across a broad range of hardware
systems: (1) sync for one internal-time cycle, and (2) accumulate for specified number of pulses. The device
also supports free-running and serial-bus-controlled integration modes if precise coupling between the sensor
and light source is not required.
Four parallel analog-to-digital converters (ADC) transform the photodiode currents to an SMBus (TCS3404) or
I²C (TCS3414) digital output that, in turn, can be input to a microprocessor. The RGB values can be read in a
single read cycle to minimize the number of read command protocols defined in the communication interface.
The slave address for this device is 39h (0111001b). A single SMB-Alert style interrupt (TCS3404) as well as
lid ^{a single traditional level-style interrupt (TCS3414) can be dynamically configured for any one of the four}
channels including a corresponding high/low threshold setting. The interrupt will remain asserted until the
firmware clears the interrupt.
a _{The TCS3404/14 devices can help (1) automatically adjust the display brightness of a backlight to extend}
battery, increase lamp life, and provide optimum viewing in diverse lighting conditions, (2) white-color balance
v _{display panel and/or captured images in diverse lighting conditions, and (3) manage RGB LED backlighting to}
ill ^{maintain color consistency over a long period of time.}
These devices are also ideal in controlling keyboard illumination in low ambient light conditions. Chromaticity
coordinates (x,y) can be used to derive color temperature for the purpose of white-color balancing of displays
t _{and/or captured images. Illuminance, in lux, can be used to approximate the human eye response of ambient}
G ^{light and to manage exposure control in digital cameras. The TCS3404/14 devices are ideal in notebook/tablet}
s _{PCs, LCD monitors, flat-panel televisions, cell phones, and digital cameras. Additional applications include}
street light control, security lighting, sunlight harvesting, and automotive instrumentation clusters.
s ^{A nt Functional Block Diagram}
e _{IR-Blocking Filter}
m ^{t (CS Package Only)}
a ⁿ _{Red Channel}
co _{Green Channel}
al _{Blue Channel}
ic_{Clear Channel}
Integrating
A/D Converter
Integrating
A/D Converter
Integrating
A/D Converter
Integrating
A/D Converter
chn ^VDD
Te^SYNC
Command
Register
Synchronization
4-Parallel ADC
Registers
Interrupt
Two-Wire Serial Interface
INT
SCL
SDA
Copyright E 2011, TAOS Inc.
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The LUMENOLOGY r Company
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