TSL26721 datasheet(20/47 Pages) OSRAM

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[v1-01] 2019-Nov-20

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TSL2672 − Principles Of Operation

Interrupts

The interrupt feature simplifies and improves system efficiency

by eliminating the need to poll the sensor for proximity values

outside 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 proximity interrupt enable (PIEN) field in the Enable register

(0x00).

Two 16-bit interrupt threshold registers allow the user to set

limits below and above a desired proximity range. An interrupt

can be generated when the proximity data (PDATA) is less than

the proximity interrupt low threshold (PILTx) or is greater than

the proximity interrupt high threshold (PIHTx).

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

an interrupt persistence feature. The persistence filter allows

the user to specify the number of consecutive out-of-range

proximity occurrences before an interrupt is generated. The

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

proximity persistence filter (PPERS) values. 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 22:

Programmable Interrupt

Prox

ADC

Prox

Data

Prox

Integration

Channel 0

Upper Limit

Lower Limit

Prox Persistence

PILTH(r 0x09), PILTL(r 0x08)

PIHTH(r 0x0B), PIHTL(r 0x0A)

PPERS(r 0x0C, b7:4)

Channel 1

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