sx8639 Semtech Corporation, sx8639 Datasheet - Page 44

• Manufacturer Part Number: sx8639
• Description: Low Power, Capacitive Button And Wheel Touch Controller 8 Sensors With Enhanced Led Drivers And Proximity Sensing
• Manufacturer: Semtech Corporation

ADVANCED COMMUNICATIONS & SENSING
Revision 7_8, September 10
Disabled CAP pins inside the wheel sensor attribution sequence are allowed, but CAP buttons inside a wheel
are not allowed (see example Figure 47 with CAP3 in a correct and a not allowed configuration).
The physical order of the wheel sensors on the PCB should correspond to the incremental CAP pin numbers.
Crossing wheel PCB sensors and CAP number is not allowed. Figure 48 shows a valid configuration and a
wrong configuration where CAP5 andCAP6 are not routed correctly on the PCB.
Figure 47
Button and Wheel good/bad configuration examples (I)
(8 sensors) with Enhanced LED Drivers and Proximity Sensing
Figure 46
© 2010 Semtech Corp.
Low Power, Capacitive Button and Wheel Touch Controller
Button examples
44
DATASHEET
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SX8639