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CAP1114 датащи(PDF) 74 Page - Microchip Technology

номер детали CAP1114
подробное описание детали  Multiple Channel Capacitive Touch Sensor and LED Driver
PDF  102 Pages
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производитель  MICROCHIP [Microchip Technology]
домашняя страница  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

CAP1114 датащи(HTML) 74 Page - Microchip Technology

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Multiple Channel Capacitive Touch Sensor and LED Driver
Datasheet
Revision 1.1 (02-04-11)
74
SMSC CAP1114
DATASHEET
The Sampling Configuration Register controls the length of the sampling window of selected Capacitive
Touch Sensor channels as indicated in the Sampling Channel Select register.
Increasing the sampling window time will have two effects. The first effect will be to increase the
effective sensitivity of that particular channel so that a touch may be detected with a smaller
ΔC.
However, at the larger sampling times, the resolution of the measurement is reduced.
The second effect will be increase the overall round robin rate (and all timing associated with the round
robin rate such as re-calibration times, repeat rate times, and maximum duration times).
All Capacitive Touch Sensors default to a sampling time of 2.5ms. Increasing the sampling time of any
single channel will increase the overall polling cycle by the same amount.
Bits 2 - 0 - OVERSAMP_RATE[2:0] - Determine the time to take a single sample. This setting applies
to all selected sensors.
6.38
Sensor Base Count Registers
Table 6.56 OVERSAMP_RATE Bit Decode
OVERSAMP_RATE[2:0]
SENSOR SAMPLING
TIME
21
0
1
0
0
40.96ms
1
0
1
20.48ms
1
1
0
10.24ms
11
1
5.12ms
0
0
0
2.56ms (default)
00
1
1.28ms
01
0
0.64ms
01
1
0.32ms
Table 6.57 Sensor Base Count Registers
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
50h
R
Sensor 1 Base
Count
128
64
32
16
8
4
2
1
00h
51h
R
Sensor 2 Base
Count
128
64
32
16
8
4
2
1
00h
52h
R
Sensor 3 Base
Count
128
64
32
16
8
4
2
1
00h
53h
R
Sensor 4 Base
Count
128
64
32
16
8
4
2
1
00h
54h
R
Sensor 5 Base
Count
128
64
32
16
8
4
2
1
00h
55h
R
Sensor 6 Base
Count
128
64
32
16
8
4
2
1
00h



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