M41T93_11 Datasheet, PDF (23/51 Pages) STMicroelectronics – Serial SPI bus real-time clock with battery switchover

M41T93
Clock operation
Table 4. Digital calibration values
Calibration value (binary)
Calibration value rounded to the nearest ppm
DC4 – DC0
0 (00000)
1 (00001)
2 (00010)
3 (00011)
4 (00100)
5 (00101)
6 (00110)
7 (00111)
8 (01000)
9 (01001)
10 (01010)
11 (01011)
12 (01100)
13 (01101)
14 (01110)
15 (01111)
16 (10000)
17 (10001)
18 (10010)
19 (10011)
20 (10100)
21 (10101)
22 (10110)
23 (10111)
24 (11000)
25 (11001)
26 (11010)
27 (11011)
28 (11100)
29 (11101)
30 (11110)
31 (11111)
N
Negative calibration (DCS = 0) Positive calibration (DCS = 1)
0
–2
–4
–6
–8
–10
–12
–14
–16
–18
–20
–22
–24
–26
–28
–31
–33
–35
–37
–39
–41
–43
–45
–47
–49
–51
–53
–55
–57
–59
–61
–63
N/491520 (per minute)
0
4
8
12
16
20
24
28
33
37
41
45
49
53
57
61
65
69
73
77
81
85
90
94
98
102
106
110
114
118
122
126
N/245760 (per minute)
Doc ID 12615 Rev 6
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