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M41ST84W bảng dữ liệu(PDF) 20 Page - STMicroelectronics

tên linh kiện M41ST84W
Giải thích chi tiết về linh kiện  3.0/3.3 V I2C serial RTC with 44 bytes of NVRAM and supervisory functions
PDF  34 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
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M41ST84W bảng dữ liệu(HTML) 20 Page - STMicroelectronics

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Clock operation
M41ST84W
20/34
Figure 12.
Crystal accuracy across temperature
Figure 13.
Clock calibration
3.4
Setting alarm clock registers
Address locations 0Ah-0Eh contain the alarm settings. The alarm can be configured to go
off at a prescribed time on a specific month, date, hour, minute, or second, or repeat every
year, month, day, hour, minute, or second. It can also be programmed to go off while the
M41ST84W is in the battery backup to serve as a system wakeup call.
Bits RPT5-RPT1 put the alarm in the repeat mode of operation. Table 4 shows the possible
configurations. Codes not listed in the table default to the once per second mode to quickly
alert the user of an incorrect alarm setting.
AI00999b
–160
0
10203040506070
Frequency (ppm)
Temperature
°C
80
–10
–20
–30
–40
–100
–120
–140
–40
–60
–80
20
0
–20
= K x (T –TO)
2
K = –0.036 ppm/
°C2 ± 0.006 ppm/°C2
TO = 25°C ± 5°C
F
AI00594B
NORMAL
POSITIVE
CALIBRATION
NEGATIVE
CALIBRATION



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