SX8644I05AWLTRT Semtech, SX8644I05AWLTRT Datasheet - Page 57

• Manufacturer Part Number: SX8644I05AWLTRT
• Description: 12-ch Capacitive Touch Solution (Button & Slider)
• Manufacturer: Semtech

ADVANCED COMMUNICATIONS & SENSING
MapAutoLight0, MapAutoLight1, MapAutoLight2, MapAutoLight3
MapAutoLightGrp0Msb, MapAutoLightGrp0Lsb, MapAutoLightGrp1Msb, MapAutoLightGrp1Lsb
Revision 7_3, January 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 Slider Segment event is mapped, the number of GPOs mapped to it determines the number of slider
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 Slider Segment event then the slider is split in
two segments. GPO[0] will turn ON for a touch on the slider segment [0, SldPosMax/2] and GPO[1] for a touch
on the slider segment [SldPosMax/2, SldPosMax].
- MapAutoLight3[3:0] should be set to 0x0C (ie Group0).
- MapAutoLightGrp0 should be set to 0x0003 (ie Btn0 or Btn1)
- key3 = 0x0
=> MapWakeupValue2 set to 0x06
MapAutoLight
BtnX
Slider Touch
Slider Move High
Slider Move Low
Slider Segment
Table 21
Autolight Mapping, Sensor Information
Touch Controller (12 sensors) with Enhanced LED Drivers
© 2009 Semtech Corp.
Segment Touched
Move High
Move Low
GPO ON
Touch
Touch
57
Ultra Low Power, Capacitive Button and Slider
(with Autolight ON)
Move High or Release
Move Low or Release
Segment Released
GPO OFF
Release
Release
and the sensor information which
DATASHEET
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SX8644