Multiple Channel Capacitive Touch Sensor and LED Driver
Datasheet
5.11 Sensor Delta Count Registers
Table 5.14 Sensor Delta Count Registers
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
Sensor 1 Delta
Count
10h
R
Sign
64
32
16
8
4
2
1
00h
Sensor 2 Delta
Count
11h
12h
13h
14h
15h
16h
17h
18h
19h
1Ah
1Bh
1Ch
1Dh
R
R
R
R
R
R
R
R
R
R
R
R
R
Sign
Sign
Sign
Sign
Sign
Sign
Sign
Sign
Sign
Sign
Sign
Sign
Sign
64
64
64
64
64
64
64
64
64
64
64
64
64
32
32
32
32
32
32
32
32
32
32
32
32
32
16
16
16
16
16
16
16
16
16
16
16
16
16
8
8
8
8
8
8
8
8
8
8
8
8
8
4
4
4
4
4
4
4
4
4
4
4
4
4
2
2
2
2
2
2
2
2
2
2
2
2
2
1
1
1
1
1
1
1
1
1
1
1
1
1
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
Sensor 3 Delta
Count
Sensor 4 Delta
Count
Sensor 5 Delta
Count
Sensor 6 Delta
Count
Sensor 7 Delta
Count
Sensor 8 Delta
Count
Sensor 9 Delta
Count
Sensor 10
Delta Count
Sensor 11
Delta Count
Sensor 12
Delta Count
Sensor 13
Delta Count
Sensor 14
Delta Count
The Sensor Delta Count registers store the delta count that is compared against the threshold used to
determine if a touch has been detected. The count value represents a change in input due to the
capacitor associated with a touch on one of the sensors and is referenced to a calibrated base “Not
touched” count value. The delta is an instantaneous change and is updated once per sensor per
sensing cycle (see Section 4.4.4 - sensor cycle).
The value presented is a standard 2’s complement number. In addition, the value is capped at a value
of 7Fh. A reading of 7Fh indicates that the sensitivity settings are too high and should be adjusted
accordingly (see Section 5.13).
The value is also capped at a negative value of FFh for negative delta counts which may result upon
a release.
SMSC CAP1014
Revision 1.65 (08-11-09)
DATA4S1HEET
SMSC [ SMSC CORPORATION ]
