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參數(shù)資料
| 型號： | M48T201V-85MH6TR |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 時鐘/數(shù)據(jù)恢復(fù)及定時提取 |
| 英文描述： | 1 TIMER(S), REAL TIME CLOCK, PDSO44 |
| 封裝： | SNAPHAT, PLASTIC, SOH-44 |
| 文件頁數(shù)： | 9/32頁 |
| 文件大小： | 448K |
| 代理商： | M48T201V-85MH6TR |
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M48T201Y, M48T201V
Table 9. Power Down/Up Mode AC Characteristics
Note: 1. Valid for Ambient Operating Temperature: TA = 0 to 70°C or –40 to 85°C; VCC = 4.5 to 5.5V or 3.0 to 3.6V (except where noted).
2. VPFD (max) to VPFD (min) fall time of less than tF may result in deselection/write protection not occurring until 200s after VCC pass-
es VPFD (min).
3. VPFD (min) to VSS fall time of less than tFB may cause corruption of RAM data.
4. tREC (min) = 20ms for industrial temperature Grade 6 device.
CLOCK OPERATION
TIMEKEEPER Registers
The M48T201Y/V offers 16 internal registers
which contain TIMEKEEPER, Alarm, Watchdog,
Flag, and Control data (see Table 10, page 18).
These registers are memory locations which con-
tain external (user accessible) and internal copies
of the data (usually referred to as BiPORT
TIMEKEEPER cells). The external copies are in-
dependent of internal functions except that they
are updated periodically by the simultaneous
transfer of the incremented internal copy. TIME-
KEEPER and Alarm Registers store data in BCD.
Control, Watchdog and Flags (Bits D0 to D3) Reg-
isters store data in Binary Format.
Reading the Clock
Updates to the TIMEKEEPER registers should be
halted before clock data is read to prevent reading
data in transition. The BiPORT TIMEKEEPER
cells in the RAM array are only data registers and
not the actual clock counters, so updating the reg-
isters can be halted without disturbing the clock it-
self.
Updating is halted when a '1' is written to the
READ Bit, D6 in the Control Register (7FFF8h). As
long as a '1' remains in that position, updating is
halted. After a halt is issued, the registers reflect
the count; that is, the day, date, and time that were
current at the moment the halt command was is-
sued.
All of the TIMEKEEPER registers are updated si-
multaneously. A halt will not interrupt an update in
progress. Updating occurs approximately 1 sec-
ond after the READ Bit is reset to a '0.'
Setting the Clock
Bit D7 of the Control Register (7FFF8h) is the
WRITE Bit. Setting the WRITE Bit to a '1,' like the
READ Bit, halts updates to the TIMEKEEPER reg-
isters. The user can then load them with the cor-
rect day, date, and time data in 24-hour BCD
format (see Table 10, page 18).
Resetting the WRITE Bit to a '0' then transfers the
values of all time registers (7FFFFh-7FFF9h,
7FFF1h) to the actual TIMEKEEPER counters and
allows normal operation to resume. After the
WRITE Bit is reset, the next clock update will occur
approximately one second later.
Note: Upon power-up following a power failure,
both the WRITE Bit and the READ Bit will be reset
to '0.'
Stopping and Starting the Oscillator
The oscillator may be stopped at any time. If the
device is going to spend a significant amount of
time on the shelf, the oscillator can be turned off to
minimize current drain on the battery. The STOP
Bit is located at Bit D7 within the Seconds Register
(7FFF9h). Setting it to a '1' stops the oscillator.
When reset to a '0,' the M48T201Y/V oscillator
starts within one second.
Note: It is not necessary to set the WRITE Bit
when setting or resetting the FREQUENCY TEST
Bit (FT) or the STOP Bit (ST).
Symbol
Parameter(1)
Min
Max
Unit
tF
(2)
VPFD (max) to VPFD (min) VCC Fall Time
300
s
tFB
(3)
VPFD (min) to VSS VCC Fall Time
M48T201Y
10
s
M48T201V
150
s
tR
VPFD (min) to VPFD (max) VCC Rise Time
10
s
tREC
(4)
VPFD (max) to RST High
40
200
ms
tRB
VSS to VPFD (min) VCC Rise Time
5s
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PDF描述 |
|---|---|
| M48T201Y-70MH6 | 1 TIMER(S), REAL TIME CLOCK, PDSO44 |
| M48T201Y-70MHTR | 1 TIMER(S), REAL TIME CLOCK, PDSO44 |
| M48T212V-70MH1 | 0 TIMER(S), REAL TIME CLOCK, PDSO44 |
| M48T212V-70MH6TR | 0 TIMER(S), REAL TIME CLOCK, PDSO44 |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| M48T201VMH | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:3.3V-5V TIMEKEEPER CONTROLLER |
| M48T201VSH | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:3.3V-5V TIMEKEEPER CONTROLLER |
| M48T201Y | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:3.3V-5V TIMEKEEPER CONTROLLER |
| M48T201Y_07 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:5.0 or 3.3V TIMEKEEPER㈢ supervisor |
| M48T201Y_09 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:5.0 or 3.3 V TIMEKEEPER? supervisor |
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