sx8638 Semtech Corporation, sx8638 Datasheet - Page 28

• Manufacturer Part Number: sx8638
• Description: Low Power, Capacitive Button And Slider Touch Controller 8 Sensors With Enhanced Led Drivers And Proximity
• Manufacturer: Semtech Corporation

SX8638
Low Power, Capacitive Button and Slider Touch Controller
(8 sensors) with Enhanced LED Drivers and Proximity
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_6, September 10
© 2010 Semtech Corp.
www.semtech.com
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