CAP1028 Datasheet, PDF (52/71 Pages) SMSC Corporation – 8 Channel Capacitive Touch Sensor with 2 LED Drivers

8 Channel Capacitive Touch Sensor with 2 LED Drivers
Datasheet
Table 5.34 STBY_SENSE Bit Decode
STBY_SENSE[2:0]
2
1
0
0
0
0
0
0
1
0
1
0
0
1
1
1
0
0
1
0
1
1
1
0
1
1
1
5.21 Standby Threshold Register
SENSITIVITY MULTIPLIER
128x (most sensitive)
64x
32x (default)
16x
8x
4x
2x
1x - (least sensitive)
ADDR R/W
43h
R/W
REGISTER
Standby
Threshold
Table 5.35 Standby Threshold Register
B7
B6
B5
B4
B3
B2
B1
B0 DEFAULT
-
64
32
16
8
4
2
1
40h
The Standby Threshold registers stores the delta threshold that is used to determine if a touch has
been detected. When a touch occurs, the input signal of the corresponding sensor changes due to the
capacitance associated with a touch. If the sensor input change exceeds the threshold settings, then
a touch is detected.
5.22 Sensor Base Count Registers
Table 5.36 Sensor Base Count Registers
ADDR R/W
REGISTER
B7
B6
50h
R
Sensor 1 Base
Count
128
64
51h
R
Sensor 2 Base
Count
128
64
52h
R
Sensor 3 Base
Count
128
64
53h
R
Sensor 4 Base
Count
128
64
54h
R
Sensor 5 Base
Count
128
64
B5
B4
B3
B2
32
16
8
4
32
16
8
4
32
16
8
4
32
16
8
4
32
16
8
4
Revision 1.1 (08-05-09)
52
DATASHEET
B1
B0 DEFAULT
2
1
C8h
2
1
C8h
2
1
C8h
2
1
C8h
2
1
C8h
SMSC CAP1028