FM3135 Integrated RTC/Alarm/FRAM & Embedded Crystal
Table 2. Calibration Adjustments
Positive Calibration for slow clocks: Calibration will achieve ± 2.17 PPM after calibration
Measured Frequency Range Error Range (PPM)
Min
Max
Min
0
2.18
Max
2.17
6.51
Program Calibration Register to:
000000
100001
100010
100011
100100
100101
100110
100111
101000
101001
101010
101011
101100
101101
101110
101111
110000
110001
110010
110011
110100
110101
110110
110111
111000
111001
111010
111011
111100
111101
111110
111111
0
1
2
3
4
5
6
7
8
512.0000
511.9989
511.9967
511.9944
511.9922
511.9900
511.9878
511.9856
511.9833
511.9811
511.9789
511.9767
511.9744
511.9722
511.9700
511.9678
511.9656
511.9633
511.9611
511.9589
511.9567
511.9544
511.9522
511.9500
511.9478
511.9456
511.9433
511.9411
511.9389
511.9367
511.9344
511.9322
511.9989
511.9967
511.9944
511.9922
511.9900
511.9878
511.9856
511.9833
511.9811
511.9789
511.9767
511.9744
511.9722
511.9700
511.9678
511.9656
511.9633
511.9611
511.9589
511.9567
511.9544
511.9522
511.9500
511.9478
511.9456
511.9433
511.9411
511.9389
511.9367
511.9344
511.9322
511.9300
6.52
10.85
15.19
19.53
23.87
28.21
32.55
36.89
41.23
45.57
49.91
54.25
58.59
62.93
67.27
71.61
75.95
80.29
84.63
88.97
93.31
97.65
101.99
106.33
110.67
115.01
119.35
123.69
128.03
132.37
136.71
10.86
15.20
19.54
23.88
28.22
32.56
36.90
41.24
45.58
49.92
54.26
58.60
62.94
67.28
71.62
75.96
80.30
84.64
88.98
93.32
97.66
102.00
106.34
110.68
115.02
119.36
123.70
128.04
132.38
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
Negative Calibration for fast clocks: Calibration will achieve ± 2.17 PPM after calibration
Measured Frequency Range Error Range (PPM)
Min
Max
Min
0
Max
2.17
Program Calibration Register to:
000000
0
1
2
3
4
5
6
7
8
512.0000
512.0011
512.0033
512.0056
512.0078
512.0100
512.0122
512.0144
512.0167
512.0189
512.0211
512.0233
512.0256
512.0278
512.0300
512.0322
512.0344
512.0367
512.0389
512.0411
512.0433
512.0456
512.0478
512.0500
512.0522
512.0544
512.0011
512.0033
512.0056
512.0078
512.0100
512.0122
512.0144
512.0167
512.0189
512.0211
512.0233
512.0256
512.0278
512.0300
512.0322
512.0344
512.0367
512.0389
512.0411
512.0433
512.0456
512.0478
512.0500
512.0522
512.0544
512.0567
2.18
6.52
6.51
000001
000010
000011
000100
000101
000110
000111
001000
001001
001010
001011
001100
001101
001110
001111
010000
010001
010010
010011
010100
010101
010110
010111
011000
10.85
15.19
19.53
23.87
28.21
32.55
36.89
41.23
45.57
49.91
54.25
58.59
62.93
67.27
71.61
75.95
80.29
84.63
88.97
93.31
97.65
101.99
106.33
110.67
10.86
15.20
19.54
23.88
28.22
32.56
36.90
41.24
45.58
49.92
54.26
58.60
62.94
67.28
71.62
75.96
80.30
84.64
88.98
93.32
97.66
102.00
106.34
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
011001
Rev. 1.2
Feb. 2009
Page 5 of 21
RAMTRON [ RAMTRON INTERNATIONAL CORPORATION ]
