AD7142_17 datasheet(5/70 Pages) AD

Part #	AD7142

Description	Programmable Controller for Capacitance Touch Sensors

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Data Sheet

AD7142

Rev. B | Page 5 of 70

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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