SX8661Z datasheet(30/87 Pages) SEMTECH

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ADVANCED COMMUNICATIONS & SENSING

DATASHEET

Revision v4.0, February 2016

www.semtech.com

SX8661Z

Low Power, Capacitive Button Touch and Proximity Controller

(8 sensors) with LED Drivers and Analog Output

3.17.2 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 SX8661Z offers additionally a triple reporting mode which allows the reporting of proximity by a medium

strong LED intensity (section 3.17.5).

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.

I2C

OFF

SX8661

HOST

SX8661

HOST

GpoCtrl = 1

I2C

GpoCtrl = 0

Figure 29

LED Control in GPO mode, Autolight OFF

OFF

Figure 30

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.

time

intensity ON

intensity OFF

fading steps

inc. time

time

intensity ON

intensity OFF

fading steps

inc. time

(a)

(b)

trigger

Figure 31

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

time

intensity ON

intensity OFF

fading steps

inc. time

time

intensity ON

intensity OFF

fading steps

inc. time

(a)

(b)

trigger

Figure 32

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

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