AN2604 - Application note

RTC calibration basics

7/14

Table 1.

Calibration table: compensation values in ppm and seconds per month

(30 days)

Calibration

value

Value in ppm

rounded to

the nearest

ppm

Value in seconds

per month (30

days) rounded to

the nearest

second

Calibration

value

Value in ppm

rounded to

the nearest

ppm

Value in seconds

per month (30

days) rounded to

the nearest

second

00

0

64

61

158

11

2

65

62

161

22

5

66

63

163

33

7

67

64

166

4

4

10

68

65

168

5

5

12

69

66

171

6

6

15

70

67

173

7

7

17

71

68

176

8

8

20

72

69

178

9

9

22

73

70

180

10

10

25

74

71

183

11

10

27

75

72

185

12

11

30

76

72

188

13

12

32

77

73

190

14

13

35

78

74

193

15

14

37

79

75

195

16

15

40

80

76

198

17

16

42

81

77

200

18

17

44

82

78

203

19

18

47

83

79

205

20

19

49

84

80

208

21

20

52

85

81

210

22

21

54

86

82

213

23

22

57

87

83

215

24

23

59

88

84

218

25

24

62

89

85

220

26

25

64

90

86

222

27

26

67

91

87

225

28

27

69

92

88

227

29

28

72

93

89

230

30

29

74

94

90

232