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M41T82 Datasheet(PDF) 30 Page - STMicroelectronics

Part # M41T82
Description  Serial I2C bus RTC with battery switchover
PDF  61 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M41T82 Datasheet(HTML) 30 Page - STMicroelectronics

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Clock operation
M41T82-M41T83
30/61
Doc ID 12578 Rev 12
Figure 17.
Crystal accuracy across temperature
Table 7.
Analog calibration values
Addr
Analog
calibration
value
D7
D6
D5
D4
D3
D2
D1
D0
CXI, CXO
CLOAD
(1)
1.
CLOAD = 1/(1/CXI + 1/CXO).
ACS
(±)
AC6
(16 pF)
AC5
(8 pF)
AC4
(4 pF)
AC3
(2 pF)
AC2
(1 pF)
AC1
(0.5 pF)
AC0
(0.25 pF)
½(CXI, CXO)
12h
0 pF
x
0
0
0
0
0
0
0
25 pF
12.5 pF
3 pF
0
0
0
0
1
1
0
0
28 pF
14 pF
5 pF
0
0
0
1
0
1
0
0
30 pF
15 pF
–7 pF
1
0
0
1
1
1
0
0
18 pF
9 pF
9.75 pF(2)
2.
Maximum negative calibration value.
0
0
1
0
0
1
1
1
34.75 pF
17.4 pF
–18 pF(3)
3.
Maximum positive calibration value.
1
1
0
0
1
0
0
0
7 pF
3.5 pF
AI07888
–160
010
20
3040506070
Frequency (ppm)
Temperature
°C
80
–10
–20
–30
–40
–100
–120
–140
–40
–60
–80
20
0
–20
= –0.036 ppm/
°C2 ± 0.006 ppm/°C2
K
ΔF
= K x (T – T
O)
2
F
T
O = 25°C ± 5°C



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