TCS3490 Datasheet, PDF (11/34 Pages) ams AG – Color Light-to-Digital Converter

TCS3490 − Functional Description
Functional Description
Communication with 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 device
typically draws only 235μA in color
operation and 1uA during power down.
The TCS3490 device provides ambient light sensing and color
temperature sensing. The internal state machine manages the
operation of the device. It controls the ALS functionality and
power down modes. Average power consumption is managed
via control of variable endurance low power wait cycles.
The interrupt feature improves system efficiency by eliminating
the need to poll the sensor. Two interrupt sources (ALS, ALS
saturation) can activate the open drain output pin. Each
interrupt source is enabled independently. ALS interrupts
appear when upper or lower thresholds are exceeded for a
consecutive number of sample readings.
The advanced digital color light sensor portion of the TCS3490
contains a segmented circular photodiode array used for color
measurements. This architecture provides stable color sensing
independent of the incident angle of light. Four integrating
analog-to-digital converters (ADCs) integrate light energy from
photodiodes simultaneously.
Figure 17:
Simplified ALS State Machine
Sleep
PON = 1
(0x80:b0)
Start
PON = 0
(0x80:b0)
RGBC
Wait
ams Datasheet
[v1-09] 2016-Jan-11
Page 11
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