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CAP1128 Datasheet(PDF) 49 Page - Microchip Technology

Part # CAP1128
Description  8 Channel Capacitive Touch Sensor with 2 LED Drivers
PDF  75 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

CAP1128 Datasheet(HTML) 49 Page - Microchip Technology

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 2015 Microchip Technology Inc.
DS00001622B-page 49
CAP1128
of approximately 0.25% of the base capacitance (or a
ΔC of 25fF from a 10pF base
capacitance). Conversely a value of 1x is the least sensitive setting available. At these
settings, the MSB of the Delta Count register corresponds to a delta count of 8192 counts
out of ~25,000 which corresponds to a touch of approximately 33% of the base capacitance
(or a
ΔC of 3.33pF from a 10pF base capacitance).
6.23
Standby Threshold Register
The Standby Threshold register 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 pad changes due to the capacitance associated with a
touch. If the sensor input change exceeds the threshold settings, a touch is detected.
6.24
Sensor Input Base Count Registers
The Sensor Input Base Count registers store the calibrated “Not Touched” input value from the capacitive touch sensor
inputs. These registers are periodically updated by the re-calibration routine.
TABLE 6-41:
STBY_SENSE BIT DECODE
STBY_SENSE[2:0]
Sensitivity Multiplier
210
0
0
0
128x (most sensitive)
001
64x
0
1
0
32x (default)
011
16x
100
8x
101
4x
110
2x
1
1
1
1x - (least sensitive)
TABLE 6-42:
STANDBY THRESHOLD REGISTER
ADDR
R/W
Register
B7
B6
B5B4
B3B2
B1B0
Default
43h
R/W
Standby Thresh-
old
-64
32
16
8
4
2
1
40h
TABLE 6-43:
SENSOR INPUT BASE COUNT REGISTERS
ADDR
R/W
Register
B7
B6
B5B4
B3B2
B1B0
Default
50h
R
Sensor Input 1
Base Count
128
64
32
16
8
4
2
1
C8h
51h
R
Sensor Input 2
Base Count
128
64
32
16
8
4
2
1
C8h
52h
R
Sensor Input 3
Base Count
128
64
32
16
8
4
2
1
C8h
53h
R
Sensor Input 4
Base Count
128
64
32
16
8
4
2
1
C8h
54h
R
Sensor Input 5
Base Count
128
64
32
16
8
4
2
1
C8h
55h
R
Sensor Input 6
Base Count
128
64
32
16
8
4
2
1
C8h
56h
R
Sensor Input 7
Base Count
128
64
32
16
8
4
2
1
C8h
57h
R
Sensor Input 8
Base Count
128
64
32
16
8
4
2
1
C8h



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