sx8635 Semtech Corporation, sx8635 Datasheet - Page 51

• 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
5.5 Wheel Parameters
Revision 7_8, October 10
Wheel Parameters
Address
0x27
0x28
0x29
0x2B
0x2C
0x2D
0x2E
0x2F
0x30
Name
WhlCfg
WhlStuckAtTimeout
WhlHysteresis
WhlNormMsb
WhlNormLsb
WhlAvgThresh
WhlCompNegThresh
WhlCompNegCntMax
WhlRotateThresh
Bits
7:4
3:2
1:0
7:0
7:0
7:0
7:0
7:0
7:0
7:0
7:0
(12 sensors) with Enhanced LED Drivers and Proximity Sensing
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 Wheel Touch/Release Hysteresis.
0x00: 0
0x01: 4
…
0x03: 12 (default)
…
0xFF: 1020
Wheel Norm Msb
Wheel 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 rotate clockwise or counter clockwise.
The threshold is a percentage of the maximum wheel position.
0x00: 0%
…
0x02: 2% (default)
© 2010 Semtech Corp.
Low Power, Capacitive Button and Wheel Touch Controller
51
Defines the 16 bits wheel norm (default 0x0140)
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SX8635