SX8661 datasheet(32/88 Pages) SEMTECH

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ADVANCED COMMUNICATIONS & SENSING

DATASHEET

Revision v3.2, January 2011

www.semtech.com

SX8661

Low Power, Capacitive Button Touch and Proximity Controller

(8 sensors) with LED Drivers and Analog Output

3.18.2 GPO Dual Reporting

GPIOs configured as GPO will operate as digital outputs which can generate both standard low/high logic levels

and PWM low/high duty cycles levels. Typical application is LED ON/OFF control. This is the dual reporting mode.

The SX8661 offers additionally a triple reporting mode which allows the reporting of proximity by a medium strong

LED intensity (section 3.18.5).

Transitions between ON and OFF states can be triggered either automatically in Autolight mode or manually by

the host. This is illustrated in figures below.

Figure 31

LED Control in GPO mode, Autolight OFF

Figure 32

LED Control in GPO mode, Autolight ON (mapped to Button)

Additionally these transitions can be configured to be done with or without fading following a logarithmic or linear

function. This is illustrated in figures below.

Figure 33

GPO ON transition (LED fade in), normal polarity, (a) linear, (b) logarithmic

Figure 34

GPO ON transition (LED fade in), inverted polarity, (a) linear, (b) logarithmic

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