sx8635 Semtech Corporation, sx8635 Datasheet - Page 43
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
CapModeMisc
CapMode11_8, CapMode7_4, CapMode3_0:
Revision 7_8, October 10
Capacitive Sensors Parameters
Address
0x1A
0x1B
0x1C
0x1D
0x1E
0x1F
0x70
By default the ASI is using a common sensitivity for all capacitive sensors as in the usual case overlay material
and sensors sizes are about equal. The register bits CapSensitivity0_1[7:4] determine the sensitivity for all
sensors in common sensitivity mode.
It might be required to have a different, individual, sensitivity for each CAP pin (for example proximity sensor
set to max sensitivity while touch sensors are set to a lower one). This can be obtained by setting
CapModeMisc[2:0] to “100” The individual sensitivity mode results in longer sensing periods than required in
common sensitivity mode.
The CAP pins can be set as a button, part of a wheel or disabled depending on the application.
Name
CapThresh7
CapThresh8
CapThresh9
CapThresh10
CapThresh11
CapPerComp
CapProxEnable
buttons
wheel
Bits
7:0
7:0
7:0
7:0
7:0
7:4
3:0
7:0
Table 15
(of four sensors)
Description
CAP7 Touch Threshold
CAP8 Touch Threshold
CAP9 Touch Threshold
CAP10 Touch Threshold
CAP11 Touch Threshold
Reserved
Periodic Offset Compensation
Enables proximity sensing:
0x46: OFF
0x74: ON
(12 sensors) with Enhanced LED Drivers and Proximity Sensing
Table 16 Possible
minimum
zero
one
© 2010 Semtech Corp.
Low Power, Capacitive Button and Wheel Touch Controller
Capacitive Sensors Parameters
43
(of six sensors)
CAP pin modes
default
one
six
Defines the periodic offset compensation.
0x0: OFF (default)
0x1: 1 second
0x2: 2 seconds
…
0x7: 7 seconds
0x8: 16 seconds
0x9: 18 seconds
…
0xE: 28 seconds
0xF: 60 seconds
(of twelve sensors)
maximum
eight
one
DATASHEET
www.semtech.com
SX8635
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