sx8646 Semtech Corporation, sx8646 Datasheet - Page 41

• Manufacturer Part Number: sx8646
• Description: Ultra Low Power, Capacitive Button Touch Controller 8 Sensors With Enhanced Led Drivers
• Manufacturer: Semtech Corporation

ADVANCED COMMUNICATIONS & SENSING
CapModeMisc
CapMode7_4, CapMode3_0:
Revision 7_4, February 10
Capacitive Sensors Parameters
Address
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 or disabled depending on the application.
Buttons and disabled CAP pins can be attributed freely (examples in Figure 41).
Name
CapPerComp
buttons
Bits
7:4
3:0
Table 15
Description
Reserved
Periodic Offset Compensation
Table 16 Possible
minimum
one
© 2010 Semtech Corp.
Capacitive Sensors Parameters
Ultra Low Power, Capacitive Button Touch Controller
41
CAP pin modes
default
eight
(8 sensors) with Enhanced LED Drivers
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
maximum
eight
DATASHEET
www.semtech.com
SX8646