sx8638 Semtech Corporation, sx8638 Datasheet - Page 56

• Manufacturer Part Number: sx8638
• Description: Low Power, Capacitive Button And Slider Touch Controller 8 Sensors With Enhanced Led Drivers And Proximity
• 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 (may be required if proximity sensing is
enable, see § 3.17 for more details).
MapWakeupValue0, MapWakeupValue1, MapWakeupValue2
For the wakeup sequence Btn2 -> Btn5 -> Btn6 ->Btn0 the required register settings are:
Revision 7_6, September 10
Mapping Parameters
Address
0x3D
0x3E
0x3F
- MapWakeupSize set to 0x04,
- key0 = 0x2
- key1 = 0x5
=> MapWakeupValue2 set to 0x52
- key2 = 0x6
- key3 = 0x0
=> MapWakeupValue2 set to 0x06
Name
MapAutoLightGrp1Msb
MapAutoLightGrp1Lsb
MapSegmentHysteresis
Bits
0
7
6
5
4
3:0
7
6
5
4
3
2
1
0
7:0
Description
Btn0
Reserved
Slider Touch
Move High
Move Low
Reserved
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
© 2010 Semtech Corp.
Low Power, Capacitive Button and Slider Touch Controller
(8 sensors) with Enhanced LED Drivers and Proximity
Mapping Parameters
56
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
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SX8638