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AD7142 Fiches technique(PDF) 6 Page - Analog Devices

No de pièce AD7142
Description  Programmable Controller for Capacitance Touch Sensors
Download  73 Pages
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Fabricant  AD [Analog Devices]
Site Internet  http://www.analog.com
Logo AD - Analog Devices

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AD7142
Rev. A | Page 5 of 72
PLASTIC OVERLAY
SENSOR BOARD
CBULK
CIN
CAPACITIVE SENSOR
Figure 2.
Table 2. Typical Average Current in Low Power Mode, AVCC, DVCC = 3.6 V, T= 25°C, Load of 50 pF on SRC Pin, No Load on SRC
Number of Conversion Stages (Current Values Expressed in μA)
Low Power Mode
Delay
Decimation
Rate
1
2
3
4
5
6
7
8
9
10
11
12
200 ms
128
26.4
33.3
40.1
46.9
53.5
60
66.5
72.8
79.1
85.2
91.3
97.3
256
35.6
49.1
62.2
74.9
87.3
99.3
111
122.3
133.4
144.2
154.7
164.9
400 ms
128
21.3
24.8
28.3
31.7
35.2
38.6
42
45.4
48.7
52
55.3
58.6
256
26
32.9
39.7
46.5
53.1
59.6
66.1
72.4
78.7
84.9
91
97
600 ms
128
19.6
21.9
24.3
26.6
28.9
31.2
33.5
35.8
38.1
40.4
42.6
44.8
256
22.7
27.4
32
36.6
41.1
45.6
50
54.4
58.8
63.1
67.4
71.6
800 ms
128
18.7
20.5
22.2
24
25.7
27.5
29.2
31
32.7
34.4
36.1
37.8
256
21.1
24.6
28.1
31.5
35
38.4
41.8
45.2
48.5
51.8
55.1
58.4
Table 3. Maximum Average Current in Low Power Mode, AVCC, DVCC = 3.6 V, Load of 50 pF on SRC Pin, No Load on SRC
Number of Conversion Stages (Current Values Expressed in μA)
Low Power Mode
Delay
Decimation
Rate
1
2
3
4
5
6
7
8
9
10
11
12
200 ms
128
45.4
53.6
61.5
69.4
77.1
84.7
92.2
99.6
106.8
113.9
121
127.9
256
56.2
72
87.2
102
116.3
130.2
143.7
156.8
169.5
181.8
193.8
205.5
400 ms
128
39.5
43.6
47.7
51.8
55.8
59.8
63.7
67.6
71.5
75.4
79.2
83
256
45
53.1
61.1
68.9
76.7
84.3
91.8
99.1
106.4
113.6
120.6
127.5
600 ms
128
37.5
40.3
43
45.8
48.5
51.2
53.9
56.5
59.2
61.8
64.5
67.1
256
41.2
46.7
52.1
57.4
62.7
67.9
73.1
78.2
83.3
88.3
93.3
98.2
800 ms
128
36.5
38.6
40.7
42.7
44.8
46.8
48.8
50.9
52.9
54.9
56.9
58.9
256
39.3
43.4
47.5
51.5
55.6
59.5
63.5
67.4
71.3
75.2
79
82.8


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