sx8647 Semtech Corporation, sx8647 Datasheet - Page 53

• Manufacturer Part Number: sx8647
• Description: Ultra Low Power, Capacitive Wheel Touch Controller 8 Sensors With Enhanced Led Drivers
• Manufacturer: Semtech Corporation

ADVANCED COMMUNICATIONS & SENSING
Revision 7_6, February 10
Examples:
- If GPO[0] should change state accordingly to rotate clockwise then MapAutoLight3[3:0] should be set to
0x0F.
- If GPO[0] should change state accordingly to a wheel touch then Group1 can be used as following:
When the Wheel Segment event is mapped, the number of GPOs mapped to it determines the number of
wheel segments. The GPO with the lowest pin index is mapped on the segment with the smallest positions.
E.g. if two GPOs (e.g.GPO[0] and GPO[1]) are mapped to the Wheel Segment event then the wheel is split in
two segments. GPO[0] will turn ON for a touch on the wheel segment [0, WhlPosMax/2] and GPO[1] for a
touch on the wheel segment [WhlPosMax/2, WhlPosMax].
- MapAutoLight3[3:0] should be set to 0x0D (ie Group1).
- MapAutoLightGrp1 should be set to 0x4000 (ie segment)
© 2010 Semtech Corp.
Touch Controller (8 sensors) with Enhanced LED Drivers
53
Ultra Low Power, Capacitive Wheel
DATASHEET
www.semtech.com
SX8647