sx8635 Semtech Corporation, sx8635 Datasheet - Page 47
sx8635
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
Datasheet
1.SX8635.pdf
(81 pages)
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ADVANCED COMMUNICATIONS & SENSING
5.4 Button Parameters
Revision 7_8, October 10
Button Parameters
Address
0x21
0x22
0x23
0x24
0x25
0x26
Name
BtnCfg
BtnAvgThresh
BtnCompNegThresh
BtnCompNegCntMax 7:0
BtnHysteresis
BtnStuckAtTimeout
Bits
7:6
5:4
3:2
1:0
7:0
7:0
7:0
7:0
Description
Defines the buttons events reporting method.
00: Multiple reporting of all touches and releases (default)
01: Single reporting of the first button touch. Next button touches and releases are
ignored until release of the first button.
10: Reserved
11: Reserved
Defines the buttons interrupt (for all buttons)
00 : Interrupts masked
01 : Triggered on Touch
10 : Triggered on Release
11 : Triggered on Touch and Release (default)
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 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-> samples
Defines the button hysteresis corresponding to a percentage of the CAP thresholds
(defined in Table 18).
0x00: 0%
…
0x0A: 10% (default)
…
0x64: 100%
All buttons use the same hysteresis
Defines the stuck at timeout.
0x00: OFF (default)
(12 sensors) with Enhanced LED Drivers and Proximity Sensing
© 2010 Semtech Corp.
Low Power, Capacitive Button and Wheel Touch Controller
47
DATASHEET
www.semtech.com
SX8635
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