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CAP1028 Datasheet(PDF) 37 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) 37 Page - SMSC Corporation

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8 Channel Capacitive Touch Sensor with 2 LED Drivers
Datasheet
SMSC CAP1028
37
Revision 1.1 (08-05-09)
DATASHEET
5.3
Noise Flag Status Registers
The Noise Flag Status registers store status bits that are generated from the analog block if the
detected noise is above the operating region of the analog detector. These bits indicate that the most
recently received data from the sensor is invalid and should not be used for touch detection.
Furthermore, so long as the bit is set for a particular channel, no decisions are made with the data. A
touch is not detected, and a release is not detected.
These bits are not sticky and will be cleared automatically if the analog block does not report a noise
error.
5.4
Sensor Delta Count Registers
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 4.5.1 - 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 5.5).
Table 5.4 Noise Flag Status Registers
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
0Ah
R
Noise Flag Status
CS8_
NOISE
CS7_
NOISE
CS6_
NOISE
CS5_
NOISE
CS4_
NOISE
CS3_
NOISE
CS2_
NOISE
CS1_
NOISE
00h
Table 5.5 Sensor Delta Count Registers
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
10h
R
Sensor 1 Delta
Count
Sign
64
32
16
8
4
2
1
00h
11h
R
Sensor 2 Delta
Count
Sign
64
32
16
8
4
2
1
00h
12h
R
Sensor 3 Delta
Count
Sign
64
32
16
8
4
2
1
00h
13h
R
Sensor 4 Delta
Count
Sign
64
32
16
8
4
2
1
00h
14h
R
Sensor 5 Delta
Count
Sign
64
32
16
8
4
2
1
00h
15h
R
Sensor 6 Delta
Count
Sign
64
32
16
8
4
2
1
00h
16h
R
Sensor 7 Delta
Count
Sign
64
32
16
8
4
2
1
00h
17h
R
Sensor 8 Delta
Count
Sign
64
32
16
8
4
2
1
00h



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