TSL2571 datasheet(16/39 Pages) OSRAM

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ams Datasheet

Page 15

[v1-01] 2018-Mar-27

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TSL2571 − 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 ALS 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 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 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 ALS

occurrences before an interrupt is generated. The persistence

(APERS) value. See the persistence 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 17:

Programmable Interrupt

CH0

ADC

CH0

Data

CH0

Upper Limit

Lower Limit

AIHTH(r 07), AIHTL(r 06)

ALS Persistence

AILTH(r 05), AILTL(r 04)

APERS(r 0x0C, b3:0)

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