sx8635 Semtech Corporation, sx8635 Datasheet - Page 58

• Manufacturer Part Number: sx8635
• Description: Low Power, Capacitive Button And Wheel Touch Controller 12 Sensors With Enhanced Led Drivers And Proximity Sensing
• Manufacturer: Semtech Corporation

ADVANCED COMMUNICATIONS & SENSING
MapAutoLight0, MapAutoLight1, MapAutoLight2, MapAutoLight3
MapAutoLightGrp0Msb, MapAutoLightGrp0Lsb, MapAutoLightGrp1Msb, MapAutoLightGrp1Lsb
Revision 7_8, October 10
These registers define the mapping between the GPO pins
will control its ON/OFF state.
The mapping can be done to a specific sensor event but also on groups (in this case any sensor event in the
group will control the GPO).
Table 21 defines for each selectable sensor event, which action will trigger corresponding GPO to switch ON
or OFF.
Examples:
- If GPO[0] should change state accordingly to Btn4 then MapAutoLight3[3:0] should be set to 0x04.
- If GPO[0] should change state accordingly to Btn0 or Btn1 then Group0 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].
MapAutoLight
BtnX
Wheel Touch
Wheel Rotation Clock Wise
Wheel Rotation Counter Clock Wise
Wheel Segment
- MapAutoLight3[3:0] should be set to 0x0C (ie Group0).
- MapAutoLightGrp0 should be set to 0x0003 (ie Btn0 or Btn1)
=> MapWakeupValue2 set to 0x52
- key2 = 0x6
- key3 = 0x0
=> MapWakeupValue2 set to 0x06
Table 21
(12 sensors) with Enhanced LED Drivers and Proximity Sensing
Autolight Mapping, Sensor Information
Rotation Counter Clock Wise
© 2010 Semtech Corp.
Low Power, Capacitive Button and Wheel Touch Controller
Rotation Clock Wise
Segment Touched
GPO ON
Touch
Touch
58
(with Autolight ON)
Rotation Clock Counter Wise or Release
Rotation Clock Wise or Release
and the sensor information which
Segment Released
GPO OFF
Release
Release
DATASHEET
www.semtech.com
SX8635