SX8661Z datasheet(31/87 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

The fading out (e.g. after a button is released) is identical to the fading in but an additional off delay can be added

before the fading starts (Figure 33 and Figure 34).

intensity OFF

intensity ON

fading steps

dec. time

trigger

time

intensity OFF

intensity ON

fading steps

(b)

trigger

off delay

dec. time

off delay

Figure 33

GPO OFF transition (LED fade out), normal polarity, (a) linear, (b) logarithmic

time

intensity OFF

intensity ON

fading steps

dec. time

(a)

trigger

time

intensity OFF

intensity ON

fading steps

dec. time

(b)

trigger

off delay

Figure 34

GPO OFF transition (LED fade out), inverted polarity, (a) linear, (b) logarithmic

Please note that standard high/low logic signals are just a specific case of GPO mode and can also be generated

simply by setting inc/dec time to 0 (i.e. OFF) and programming intensity OFF/ON to 0x00 and 0xFF.

3.17.3 GPO Fading

The SX8661Z supports two different fading modes, namely Single and Continuous. These fading modes can be

configured for each GPIO individually. Please see 5.9 “GPIO Parameters” for more information on how to

configure this feature.

i) Single Fading Mode:

The GPO pin fades in when the associated button is touched and it fades out when it is released. This is shown in

Figure 35

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