TSL27711 datasheet(20/51 Pages) OSRAM

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ams Datasheet

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[v1-00] 2016-Mar-22

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TSL2771 − Principles Of Operation

Figure 22:

Proximity ADC Count vs. Relative Distance

Interrupts

The interrupt feature simplifies and improves system efficiency

by eliminating the need to poll the sensor for light intensity or

proximity 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 proximity interrupt enable (PIEN) or

ALS interrupt enable (AIEN) fields in the enable register (0x00).

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

limits below and above a desired light level and proximity

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). Likewise, an out-of-range proximity interrupt can be

generated when the proximity data (PDATA) falls below the

proximity interrupt low threshold (PILTx) or exceeds the

proximity interrupt high threshold (PIHTx). 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 or

proximity occurrences before an interrupt is generated. The

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

persistence (APERS) and the proximity persistence (PPERS)

values. See the persistence register for details on the

persistence filter values. Once the persistence filter generates

Relative Distance

y 2y 4y

200

400

600

800

1000

100 mA,

64 Pulses

100 mA,

16 Pulses

100 mA,

4 Pulses

100 mA,

1 Pulse

25 mA,

1 Pulse

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