sx8645 Semtech Corporation, sx8645 Datasheet - Page 44

• Manufacturer Part Number: sx8645
• Description: Ultra Low Power, Capacitive Button And Wheel Touch Controller 12 Sensors With Enhanced Led Drivers
• Manufacturer: Semtech Corporation

ADVANCED COMMUNICATIONS & SENSING
Revision 7_5, February 10
Buttons and disabled CAP pins can be attributed freely (examples in Figure 46).
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)
Touch Controller (12 sensors) with Enhanced LED Drivers
Figure 46
© 2010 Semtech Corp.
Button examples
44
Ultra Low Power, Capacitive Button and Wheel
DATASHEET
www.semtech.com
SX8645