sx8644 Semtech Corporation, sx8644 Datasheet - Page 28

• Manufacturer Part Number: sx8644
• Description: Ultra Low Power, Capacitive Button And Slider Touch Controller 12 Sensors With Enhanced Led Drivers
• Manufacturer: Semtech Corporation

SX8644
Ultra Low Power, Capacitive Button and Slider
Touch Controller (12 sensors) with Enhanced LED Drivers
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
GPO ON transition (LED fade in), inverted polarity, (a) linear, (b) logarithmic
Figure 32
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).
GPO OFF transition (LED fade out), normal polarity, (a) linear, (b) logarithmic
Figure 33
GPO OFF transition (LED fade out), inverted polarity, (a) linear, (b) logarithmic
Figure 34
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 (ie OFF) and programming intensity OFF/ON to 0x00 and 0xFF.
Revision 7_3, January 10
© 2009 Semtech Corp.
www.semtech.com
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