TCS34713FN datasheet(16/39 Pages) OSRAM

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[v1-01] 2018-Mar-27

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TCS3471 − Principles Of Operation

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 it’s 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 range. An interrupt

can be generated when the RGBC Clear data (CDATA) falls

outside of the desired light level range, as determined by the

values in the RGBC interrupt low threshold registers (AILTx) and

RGBC interrupt high threshold registers (AIHTx). It is important

to note that the low threshold value must be less than the high

threshold value for proper operation.

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 RGBC

occurrences before an interrupt is generated. The persistence

value. See the Persistence Register (0x0C) for details on the

persistence filter values. Once the persistence filter generates

an interrupt, it will continue until a special function interrupt

clear command is received (see Command Register).

Figure 19:

Programmable Interrupt

Clear

ADC

Clear

Data

Clear

Upper Limit

Lower Limit

AIHTH(r 07), AIHTL(r 06)

RGBC Persistence

AILTH(r 05), AILTL(r 04)

PPERS(r 0x0C, b3:0)

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