SX8663 datasheet(26/64 Pages) SEMTECH

Part #	SX8663

Description	Capacitive Button Matrix (up to 36) and Proximity Controller with Individual LED Drivers and Buzzer Output

PDF	64 Pages

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Manufacturer	SEMTECH [Semtech Corporation]

Direct Link	http://www.semtech.com

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26 / 64 page

ADVANCED COMMUNICATIONS & SENSING

Rev5 4

th August 2011

www.semtech.com

SX8663

Capacitive Button Matrix (up to 36) and Proximity Controller

with Individual LED Drivers and Buzzer Output

Figure 28

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

Figure 29

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.

3.15.2 Fading Modes

The SX8663 supports two different fading modes, namely Single and Continuous. These fading modes can be

configured for each GPIO individually. Please see 5.7 “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 30

fading-in

OFF intensity

ON intensity

delay_off

fading-out

OFF intensity

OFF

Figure 30

Single Fading Mode

ii) Continuous Fading Mode:

SX8663 Datasheet(PDF) 26 Page - Semtech Corporation