sx8638 Semtech Corporation, sx8638 Datasheet - Page 51
sx8638
Manufacturer Part Number
sx8638
Description
Low Power, Capacitive Button And Slider Touch Controller 8 Sensors With Enhanced Led Drivers And Proximity
Manufacturer
Semtech Corporation
Datasheet
1.SX8638.pdf
(80 pages)
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ADVANCED COMMUNICATIONS & SENSING
5.5 Slider Parameters
Revision 7_6, September 10
Slider Parameters
Address
0x27
0x28
0x29
0x2B
0x2C
0x2D
0x2E
0x2F
0x30
Name
SldCfg
SldStuckAtTimeout
SldHysteresis
SldNormMsb
SldNormLsb
SldAvgThresh
SldCompNegThresh
SldCompNegCntMax 7:0
SldMoveThresh
Bits
7:4
3:2
1:0
7:0
7:0
7:0
7:0
7:0
7:0
7:0
Description
Reserved
Defines the number of samples at the scan period for determining a release
00: OFF, use incoming sample (default)
01: 2 samples debounce
10: 3 samples debounce
11: 4 samples debounce
Defines the number of samples at the scan period for determining a touch
00: OFF, use incoming sample (default)
01: 2 samples debounce
10: 3 samples debounce
11: 4 samples debounce
Defines the stuck at timeout.
0x00: OFF (default)
0x01: 1 second
…
0xFF: 255 seconds
Defines the Slider Touch/Release Hysteresis.
0x00: 0
0x01: 4
…
0x03: 12 (default)
…
0xFF: 1020
Slider Norm Msb
Slider Norm Lsb
Defines the positive threshold for disabling the processing filter averaging.
If ticks are above the threshold, then the averaging is suspended
0x00: 0
0x01: 4
…
0x50: 320 (default)
…
0xFF: 1020
Defines the negative offset compensation threshold.
0x00: 0
0x01: 4
…
0x50: 320 (default)
…
0xFF: 1020
Defines the number of ticks (below the negative offset compensation threshold)
which will initiate an offset compensation.
0x00: Reserved
0x01: 1 sample (default)
…
0xFF: 255 samples
Defines the threshold for detecting a move high or move low.
The threshold is a percentage of the maximum slider position.
0x00: 0%
…
0x02: 2% (default)
© 2010 Semtech Corp.
Low Power, Capacitive Button and Slider Touch Controller
(8 sensors) with Enhanced LED Drivers and Proximity
51
Defines the 16 bits slider norm (default 0x0180)
DATASHEET
www.semtech.com
SX8638
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