5 and 6 Channel Capacitive Touch Sensor
Datasheet
Bits 2 - 0 - CAL_CFG[2:0] - Determines the update time and number of samples of the automatic re-
calibration routine. The settings applies to all sensors universally (though individual sensors can be
configured to support re-calibration - see Section 5.11).
Table 5.25 CAL_CFG Bit Decode
CAL_CFG[2:0]
RECALIBRATION
SAMPLES (SEE
UPDATE TIME (SEE
2
1
0
Note 5.1)
Note 5.2)
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
16
32
16
32
64
64
256
256
256
256
256
256 (default)
1024
2048
4096
7936
Note 5.1 Recalibration Samples refers to the number of samples that are measured and averaged
before the Base Count is updated however does not control the base count update period.
Once this target number of update cycles is reached, the device may wait additional time
as determined by the Update Time before the base count is updated as determiend by the
settings.
Note 5.2 Update Time refers to the amount of time (in polling cycle periods) that elapses before the
Base Count is updated. For those settings that have the Update Time greater than the
Recalibration Samples value, the device will wait (and continue to average the updated
base count) until the Update Time has elapsed before the base count is updated.
5.16 Sensor Threshold Registers
Table 5.26 Sensor Threshold Registers
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
Sensor 1
Threshold
30h
R/W
-
64
32
16
8
4
2
1
40h
Sensor 2
Threshold
31h
32h
33h
34h
35h
R/W
R/W
R/W
R/W
R/W
-
-
-
-
-
64
64
64
64
64
32
32
32
32
32
16
16
16
16
16
8
8
8
8
8
4
4
4
4
4
2
2
2
2
2
1
1
1
1
1
40h
40h
40h
40h
40h
Sensor 3
Threshold
Sensor 4
Threshold
Sensor 5
Threshold
Sensor 6
Threshold
SMSC CAP1005 / CAP1006
Revision 1.1 (08-05-09)
DATA4S1HEET
SMSC [ SMSC CORPORATION ]
