SX8635I05AWLTRT SEMTECH [Semtech Corporation], SX8635I05AWLTRT Datasheet - Page 43

• Manufacturer Part Number: SX8635I05AWLTRT
• Description: Low Power, Capacitive Button and Wheel Touch Controller with Enhanced LED
• Manufacturer: SEMTECH [Semtech Corporation]

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