TCS37717FN datasheet(21/49 Pages) OSRAM

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[v1-31] 2018-Apr-04

TCS3771 − Principles of Operation

The combination of LED power and number of pulses can be

used to control the distance at which the sensor can detect

proximity. Figure 24 shows an example of the distances covered

with settings such that each curve covers 2× the distance.

Counts up to 64 pulses provide a 16× range.

Figure 24:

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

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

generated when the proximity data (PDATA) falls below the

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