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TCS3472 Datasheet(PDF) 10 Page - ams AG

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

TCS3472 Datasheet(HTML) 10 Page - ams AG

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TCS3472
COLOR LIGHT-TO-DIGITAL CONVERTER
with IR FILTER
TAOS135 − AUGUST 2012
9
The LUMENOLOGY
r Company
r
r
Copyright
E 2012, TAOS Inc.
www.taosinc.com
Interrupts
The interrupt feature simplifies and improves system efficiency by eliminating the need to poll the sensor for
light intensity values outside of a user-defined range. While the interrupt function is always enabled and its
status is available in the status register (0x13), the output of the interrupt state can be enabled using the RGBC
interrupt enable (AIEN) field in the enable register (0x00).
Two 16-bit interrupt threshold registers allow the user to set limits below and above a desired light level. An
interrupt can be generated when the Clear data (CDATA) is less than the Clear interrupt low threshold (AILTx)
or is greater than the Clear interrupt high threshold (AIHTx).
It is important to note that the thresholds are evaluated in sequence, first the low threshold, then the high
threshold. As a result, if the low threshold is set above the high threshold, the high threshold is ignored and only
the low threshold is evaluated.
To further control when an interrupt occurs, the device provides a persistence filter. The persistence filter allows
the user to specify the number of consecutive out-of-range Clear occurrences before an interrupt is generated.
The persistence filter register (0x0C) allows the user to set the Clear persistence filter (APERS) value. See the
persistence filter register for details on the persistence filter value. Once the persistence filter generates an
interrupt, it will continue until a special function interrupt clear command is received (see command register).
Clear
ADC
Clear
Data
Clear
Upper Limit
Lower Limit
AIHTH(r0x 07), AIHTL(r0x 06)
Clear Persistence
AILTH(r 0x05), AILTL(r0x 04)
APERS(r 0x0C, b3:0)
Figure 8. Programmable Interrupt


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