TSL25721 datasheet(17/41 Pages) OSRAM

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[v2-00] 2022-Nov-30

TSL2572 − Principles O f 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 ALS interrupt enable (AIEN) fields 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 ALS CH0 data (C0DATA) falls outside of

the desired light level range, as determined by the values in the

ALS interrupt low threshold registers (AILTx) and ALS interrupt

high threshold registers (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 ALS

occurrences before an interrupt is generated. The persistence

filter register (0x0C) allows the user to set the ALS persistence

filter (APERS) value. See the persistence filter register 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 18:

Programmable Interrupt

CH0

ADC

CH0

Data

CH0

Upper Limit

Lower Limit

AIHTH(r07), AIHTL(r06)

ALS Persistence

AILTH(r05), AILTL(r04)

APERS(r0x0C, b3:0)

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