sx8661 Semtech Corporation, sx8661 Datasheet - Page 33

• Manufacturer Part Number: sx8661
• Description: Low Power, Capacitive Button Touch And Proximity Controller 8 Sensors With Led Drivers And Analog Output
• Manufacturer: Semtech Corporation

SX8661
Low Power, Capacitive Button Touch and Proximity Controller
(8 sensors) with LED Drivers and Analog Output
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
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 35 and Figure 36).
GPO OFF transition (LED fade out), normal polarity, (a) linear, (b) logarithmic
Figure 35
GPO OFF transition (LED fade out), inverted polarity, (a) linear, (b) logarithmic
Figure 36
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.
3.18.3 GPO Fading
The SX8661 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 37
Revision v3.2, January 2011
© 2011 Semtech Corp.
www.semtech.com
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