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參數(shù)資料
| 型號： | M41T83ZQA6E |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 時鐘/數(shù)據(jù)恢復及定時提取 |
| 英文描述： | 1 TIMER(S), REAL TIME CLOCK, QCC16 |
| 封裝： | 4 X 4 MM, ROHS COMPLIANT, QFN-16 |
| 文件頁數(shù)： | 35/61頁 |
| 文件大?。?/td> | 983K |
| 代理商： | M41T83ZQA6E |
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Clock operation
M41T82-M41T83
Doc ID 12578 Rev 12
The M41T8x only checks the battery when powered by VCC. It does not check the battery
while in backup mode. Thus, users are advised that during long periods in backup mode,
the battery can drop to a level at which timekeeping may fail or data becomes corrupted. If,
at power-up, a battery low is indicated, data integrity should be verified.
Forcing a battery check
If it is desired to check the battery at an arbitrary time, one common technique is for the
application software to write the time to just before midnight, 23:59:59, and then wait two
seconds thereby letting the clock rollover and causing the BL bit to update. The application
then restores the time back to its previous value plus two seconds.
3.11
Century bits
These two bits will increment in a binary fashion at the turn of the century, and handle all
leap years correctly. See Table 14 for additional explanation.
3.12
Oscillator fail detection
If the oscillator fail (OF) bit is internally set to a '1,' this indicates that the oscillator has either
stopped, or was stopped for some period of time. This bit can be used to judge the validity of
the clock and date data. This bit will be set to '1' any time the oscillator stops.
In the event the OF bit is found to be set to '1' at any time other than the initial power-up, the
STOP bit (ST) should be written to a '1,' then immediately reset to 0. This will restart the
oscillator. The following conditions can cause the OF bit to be set:
●
The first time power is applied (defaults to a '1' on power-up).
Note:
If the OF bit cannot be written to '0' four seconds after the initial power-up, the STOP bit (ST)
should be written to a '1,' then immediately reset to 0.
●
The voltage present on V
CC or battery is insufficient to support oscillation.
●
The ST bit is set to '1.'
●
External interference of the crystal
For the M41T83, if the oscillator fail interrupt enable bit (OFIE) is set to a '1,' the
IRQ1/FT/OUT pin will also be asserted (see Section 3.13 and Section 3.14 for additional
conditions which apply). The IRQ1/FT/OUT output is de-asserted by resetting the OF bit to
0, NOT by reading the flags register. The OF bit will remain a '1' until written to 0. Reading
the flags register has no effect on OF.
Table 14.
Century bits examples
CB0
CB1
Leap Year?
Example(1)
1.
Leap year occurs every four years (for years evenly divisible by four), except for years evenly divisible by
100. The only exceptions are those years evenly divisible by 400 (the year 2000 was a leap year, year
2100 is not).
00
Yes
2000
0
1
No
2100
1
0
No
2200
1
No
2300
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| M41T83RMY6E | 1 TIMER(S), REAL TIME CLOCK, PDSO18 |
| M41T83ZQA6F | 1 TIMER(S), REAL TIME CLOCK, QCC16 |
| M41T82SM6E | 1 TIMER(S), REAL TIME CLOCK, PDSO8 |
| M41T83ZMY6E | 1 TIMER(S), REAL TIME CLOCK, PDSO18 |
| M41T83ZMY6F | 1 TIMER(S), REAL TIME CLOCK, PDSO18 |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| M41T83ZQA6F | 功能描述:實時時鐘 Serial I2C bus RTC RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時間格式:HH:MM:SS RTC 存儲容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| M41T93 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Serial SPI bus RTC with battery switchover |
| M41T93_07 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Serial SPI bus RTC with battery switchover |
| M41T93_08 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Serial SPI bus RTC with battery switchover |
| M41T93_11 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Serial SPI bus real-time clock with battery switchover |
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