sx8644 Semtech Corporation, sx8644 Datasheet - Page 56

• Manufacturer Part Number: sx8644
• Description: Ultra Low Power, Capacitive Button And Slider Touch Controller 12 Sensors With Enhanced Led Drivers
• Manufacturer: Semtech Corporation

ADVANCED COMMUNICATIONS & SENSING
MapWakeupSize
The number of keys defining the wakeup sequence can be set from 1 to 6.
If the size is set to 0 then wakeup is done on any sensor event.
if the size is set to 6 then wakeup is done only by GPI or an I2C command.
MapWakeupValue0, MapWakeupValue1, MapWakeupValue2
For the wakeup sequence Btn2 -> Btn5 -> Btn6 ->Btn0 the required register settings are:
Revision 7_3, January 10
Mapping Parameters
Address
0x3D
0x3E
0x3F
- MapWakeupSize set to 0x04,
- key0 = 0x2
- key1 = 0x5
=> MapWakeupValue2 set to 0x52
- key2 = 0x6
Name
MapAutoLightGrp1Msb
MapAutoLightGrp1Lsb
MapSegmentHysteresis
Bits
2
1
0
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
7:0
Description
Btn2
Btn1
Btn0
Reserved
Slider Touch
Move High
Move Low
Btn11
Btn10
Btn9
Btn8
Btn7
Btn6
Btn5
Btn4
Btn3
Btn2
Btn1
Btn0
Defines the position hysteresis for detecting a segment change.
The hysteresis is defined as a percentage of the maximum slider position.
0x00: 0%
…
0x02: 2% (default)
…
0x64: 100%
This hysteresis applies to all segments of the slider.
Table 20
Touch Controller (12 sensors) with Enhanced LED Drivers
© 2009 Semtech Corp.
Mapping Parameters
56
Ultra Low Power, Capacitive Button and Slider
Defines Group1 sensor events:
0: OFF (default)
1: ON
If any of the enabled sensor events occurs the
Group0 event will occur as well.
All sensors events within the group can be
independently set.
DATASHEET
www.semtech.com
SX8644