參數(shù)資料
型號(hào)： M41T00AUDD1E
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： REAL TIME CLOCK, DSO16
封裝： 5 X 4 MM, ROHS COMPLIANT, DFN-16
文件頁(yè)數(shù)： 9/42頁(yè)
文件大?。?/td> 333K
代理商： M41T00AUDD1E
M41T00AUD
M41T00AUD clock operation
Register 08 is the calibration register. Calibration is described in detail in the clock
calibration section. Bit D7 is the OUT bit and controls the discrete output pin IRQ/FT/OUT as
described in Table 5.
5.1.1
Halt bit operation
Bit D7 of register 09 h is the HT or halt bit. Whenever the device switches to backup power,
it sets the HT bit to 1 and stores the time of power-down in the transfer buffer registers. This
is known as power-down time stamp. During normal timekeeping, once per second, the
transfer buffer registers are updated with the current time. When HT is 1, that updating is
halted. The clock continues to keep time but the periodic updates do not occur.
Upon power-up, reads of the clock registers will return the time of power-down (assuming
adequate backup power was maintained while VCC was off). After the user clears the HT bit
by writing it to 0, subsequent reads of the clock registers will return the current time.
At power-up, the user can read the time of power-down, and then clear the HT bit to allow
updates. The next read will return the current time. Knowing both the power-up time and the
power-down time allows the user to calculate the duration of power-off.
In addition to the HT bit getting set to 1 automatically at power-down, the user can also write
it to 1 to halt updating of the registers.
5.1.2
Oscillator fail detect operation
Bits D5 and D4 of register 09 h contain the oscillator fail flag (OF) and the oscillator fail
interrupt enable bit (OFIE). If the 32 KHz oscillator drops four or more pulses in a row, as
might occur during an extended outage while backed up on a capacitor, the OF bit will be set
to 1. This provides an indication to the user of the integrity of the timekeeping operation.
Whenever the OF bit is a 1, the system should consider the time to be possibly corrupted
due to operating at too low a voltage. The OF bit will always be 1 at the initial power-up of
the device. The OF bit is cleared by writing it to 0. At the initial power-up, users should wait
three seconds for the oscillator to stabilize before clearing the OF bit.
OFIE can be used to enable the device to assert its interrupt output whenever an oscillator
failure is detected. The oscillator fail interrupt will drive the IRQ/FT/OUT pin as described in
Table 5. The interrupt is cleared by writing the OF bit to 0. Setting OFIE enables the
oscillator fail interrupt. Clearing it to 0 disables it, but the OF will continue to function
regardless of OFIE.
5.1.3
Trickle charger
Bits D6 and D3 to D0, of register 09h, control the trickle charge function. It is described in
detail in the trickle charge circuit section.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
M41T00AUDD1F 功能描述:實(shí)時(shí)時(shí)鐘 SERIAL RTC W/AUDIO 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
M41T00CAP 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Serial access real-time clock (RTC) with integral backup battery and crystal
M41T00CAPPC1 制造商:STMicroelectronics 功能描述:REAL TIME CLOCK SERL 8BYTE 16DFN - Bulk 制造商:STMicroelectronics 功能描述:IC RTC SERIAL W/AUDIO 24PDIP
M41T00M 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Serial Access TIMEKEEPER
M41T00M6 功能描述:實(shí)時(shí)時(shí)鐘 Serial 64 (8X8) 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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