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CAP1028 Datasheet(PDF) 48 Page - SMSC Corporation

Part # CAP1028
Description  8 Channel Capacitive Touch Sensor with 2 LED Drivers
PDF  71 Pages
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Manufacturer  SMSC [SMSC Corporation]
Direct Link  http://www.smsc.com
Logo SMSC - SMSC Corporation

CAP1028 Datasheet(HTML) 48 Page - SMSC Corporation

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8 Channel Capacitive Touch Sensor with 2 LED Drivers
Datasheet
Revision 1.1 (08-05-09)
48
SMSC CAP1028
DATASHEET
5.16
Sensor Threshold Registers
The Sensor Threshold registers store 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.
When the BUT_LD_TH bit is set (see Section 5.15 - bit 7), writing data to the Sensor 1 Threshold
register will update all of the sensor threshold registers (31h - 37h inclusive).
5.17
Sensor Noise Threshold Registers
The Sensor Noise Threshold registers control the value of a secondary internal threshold to detect
noise and improve the automatic recalibration routine. If a Capacitive Touch Sensor output exceeds
the Sensor Noise Threshold but does not exceed the sensor threshold, then it is determined to be
caused by a noise spike. That sample is not used by the automatic re-calibration routine.
The Sensor Noise Threshold is proportional to the programmed threshold as shown in Table 5.28.
Table 5.26 Sensor Threshold Registers
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
30h
R/W
Sensor 1
Threshold
-64
32
16
8
4
2
1
40h
31h
R/W
Sensor 2
Threshold
-64
32
16
8
4
2
1
40h
32h
R/W
Sensor 3
Threshold
-64
32
16
8
4
2
1
40h
33h
R/W
Sensor 4
Threshold
-64
32
16
8
4
2
1
40h
34h
R/W
Sensor 5
Threshold
-64
32
16
8
4
2
1
40h
35h
R/W
Sensor 6
Threshold
-64
32
16
8
4
2
1
40h
36h
R/W
Sensor 7
Threshold
-64
32
16
8
4
2
1
40h
37h
R/W
Sensor 8
Threshold
-64
32
16
8
4
2
1
40h
Table 5.27 Sensor Noise Threshold Registers
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
38h
R/W
Sensor Noise
Threshold 1
CS4_BN_TH
[1:0]
CS3_BN_TH
[1:0]
CS2_BN_TH
[1:0]
CS1_BN_TH
[1:0]
55h
39h
R/W
Sensor Noise
Threshold 2
CS8_BN_TH
[1:0]
CS7_BN_TH
[1:0]
CS6_BN_TH
[1:0]
CS5_BN_TH
[1:0]
55h



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