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參數(shù)資料
| 型號(hào)： | M41T81MY |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | SERIAL ACCESS RTC WITH ALARMS |
| 中文描述： | 串行訪問時(shí)鐘用鬧鐘 |
| 文件頁數(shù)： | 4/28頁 |
| 文件大?。?/td> | 386K |
| 代理商： | M41T81MY |
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M41T81
4/28
SUMMARY DESCRIPTION
The M41T81 Serial Access TIMEKEEPER
SRAM is a low power Serial RTC with a built-in
32.768 KHz oscillator (external crystal controlled).
Eight bytes of the SRAM (see Table 10, page 16)
are used for the clock/calendar function and are
configured in binary coded decimal (BCD) format.
An additional 12 bytes of SRAM provide status/
control of Alarm, Watchdog and Square Wave
functions. Addresses and data are transferred se-
rially via a two line, bi-directional I
2
C interface. The
built-in address register is incremented automati-
cally after each WRITE or READ data byte.
The M41T81 has a built-in power sense circuit
which detects power failures and automatically
switches to the battery supply when a power fail-
ure occurs. The energy needed to sustain the
SRAM and clock operations can be supplied by a
small lithium button supply when a power failure
occurs. Functions available to the user include a
non-volatile, time-of-day clock/calendar, Alarm in-
terrupts, Watchdog Timer and programmable
Square Wave output. The eight clock address lo-
cations contain the century, year, month, date,
day, hour, minute, second and tenths/hundredths
of a second in 24 hour BCD format. Corrections for
28, 29 (leap year - valid until year 2100), 30 and 31
day months are made automatically.
The M41T81 is supplied in either an 8-pin SOIC or
an 18-pin (MY) or 28-pin (MX), 300mil SOIC pack-
age which includes an embedded 32kHz crystal.
The 8-pin and 28-pin, embedded crystal SOIC re-
quires only a user-supplied battery to provide non-
volatile operation.
Figure 4. Logic Diagram
Note: 1. For SO8 package only.
Table 1. Signal Names
Note: 1. For SO8 package only.
SCL
VCC
M41T81
VSS
SDA
IRQ/FT/OUT/SQW
VBAT
XI
(1)
XO
(1)
AI04613
XI
(1)
Oscillator Input
XO
(1)
Oscillator Output
IRQ/OUT/
FT/SQW
Interrupt / Output Driver / Frequency
Test / Square Wave (Open Drain)
SDA
Serial Data Input/Output
SCL
Serial Clock Input
V
BAT
Battery Supply Voltage
V
CC
Supply Voltage
V
SS
Ground
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| M41T81MX6TR | SERIAL ACCESS RTC WITH ALARMS |
| M41T81SMY6FT | Serial Access Real-Time Clock with Alarms |
| M41T81SMY6ET | Serial Access Real-Time Clock with Alarms |
| M41T81SM6ET | Serial Access Real-Time Clock with Alarms |
| M41T81SM6F | Serial Access Real-Time Clock with Alarms |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| M41T81MY6 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Serial Access Real-Time Clock with Alarms |
| M41T81MY6TR | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Serial Access Real-Time Clock with Alarms |
| M41T81S | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Serial access real-time clock with alarms |
| M41T81S_07 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Serial access real-time clock with alarms |
| M41T81S_12 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Serial access real-time clock (RTC) with alarms |
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