SX8644I05AWLTRT Semtech, SX8644I05AWLTRT Datasheet - Page 43

• Manufacturer Part Number: SX8644I05AWLTRT
• Description: 12-ch Capacitive Touch Solution (Button & Slider)
• Manufacturer: Semtech

ADVANCED COMMUNICATIONS & SENSING
CapModeMisc
CapMode11_8, CapMode7_4, CapMode3_0:
Revision 7_3, January 10
Capacitive Sensors Parameters
Address
0x1A
0x1B
0x1C
0x1D
0x1E
0x1F
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.
In special applications it might be required to have a different, individual, sensitivity for each CAP pin. This can
be obtained by setting bit CapModeMisc[2]. 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 slider or disabled depending on the application.
Name
CapThresh7
CapThresh8
CapThresh9
CapThresh10
CapThresh11
CapPerComp
buttons
slider
Bits
7:0
7:0
7:0
7:0
7:0
7:4
3:0
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
Table 16 Possible
minimum
Touch Controller (12 sensors) with Enhanced LED Drivers
zero
one
© 2009 Semtech Corp.
Capacitive Sensors Parameters
43
Ultra Low Power, Capacitive Button and Slider
(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
SX8644