參數(shù)資料
型號(hào)： M41T81M6F
廠商： STMICROELECTRONICS
元件分類： 時(shí)鐘/數(shù)據(jù)恢復(fù)及定時(shí)提取
英文描述： 1 TIMER(S), REAL TIME CLOCK, PDSO8
封裝： 0.150 INCH, LEAD FREE, PLASTIC, SOIC-8
文件頁(yè)數(shù)： 25/29頁(yè)
文件大?。?/td> 454K
代理商： M41T81M6F
M41T81
Description
Doc ID 7529 Rev 10
1
Description
The M41T81 is a low-power serial RTC with a built-in 32.768 kHz oscillator (external crystal
controlled). Eight bytes of the SRAM 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 serially via a two line, bidirectional I2C interface. The built-in address register is
incremented automatically 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 failure 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
interrupts, watchdog timer and programmable square wave output. The eight clock address
locations 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 an 8-pin SOIC.
Figure 1.
Logic diagram
Table 1.
Signal names
XI
Oscillator input
XO
Oscillator output
IRQ/OUT/FT/SQW
Interrupt / output driver / frequency test / square wave (open drain)
SDA
Serial data input/output
SCL
Serial clock input
VBAT
Battery supply voltage
VCC
Supply voltage
VSS
Ground
SCL
VCC
M41T81
VSS
SDA
IRQ/FT/OUT/SQW
VBAT
XI
XO
AI04613
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
M41T81M6F-CUT TAPE 制造商:ST 功能描述:M41T Series 2 V Serial I2C Real Time Clock with Alarm - SOIC-8
M41T81M6TR 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Serial Access Real-Time Clock with Alarms
M41T81MX 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:SERIAL ACCESS RTC WITH ALARMS
M41T81MX6 功能描述:實(shí)時(shí)時(shí)鐘 Serial 512 (64x8) 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(shí)間格式:HH:MM:SS RTC 存儲(chǔ)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(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube
M41T81MX6TR 功能描述:實(shí)時(shí)時(shí)鐘 Serial 512 (64x8) 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(shí)間格式:HH:MM:SS RTC 存儲(chǔ)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(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube
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