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參數(shù)資料
| 型號： | DS1501WE |
| 英文描述： | Real-Time Clock |
| 中文描述： | 實時時鐘 |
| 文件頁數(shù)： | 13/30頁 |
| 文件大?。?/td> | 291K |
| 代理商： | DS1501WE |
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DS1501/DS1511
13 of 30
WAKE UP/KICKSTART
The DS1501/DS1511 incorporates a wake up feature that can power the system on at a pre-determined
day/date and time through activation of the
PWR
output pin. In addition, the kickstart feature can allow
the system to be powered up in response to a high to low transition on the
KS
pin, without operating
voltage applied to the V
CC
pin. As a result, system power may be applied upon such events as key closure,
or a modem ring detect signal. In order to use the kickstart features, the DS1501/DS1511 must have an
auxiliary battery connected to the V
BAUX
pin. The oscillator must be running to make use of the wakeup
feature.
The wake up feature is controlled through the Time of Day/Date Power Enable bit TPE. Setting TPE to
"1" enables the wake up feature. Writing TPE to a "0" disables the wake up feature. The kickstart feature
is always enabled as long as V
BAUX
is present.
If the wake up feature is enabled, while the system is powered down (no V
CC
voltage), the clock/calendar
will monitor the current day or date for a match condition with day/date alarm register (0Bh). In
conjunction with the day/date alarm register, the hours, minutes, and seconds alarm bytes in the clock
calendar register map (02h, 01h, and 00h) are also monitored. As a result, a wake up will occur at the day
or date and time specified by the day/date, hours, minutes, and seconds alarm register values. This
additional alarm will occur regardless of the programming of the TIE bit. When the match condition
occurs, the
PWR
pin will automatically be driven low. This output can be used to turn on the main system
power supply that provides V
CC
voltage to the DS1501/DS1511 as well as the other major components in
the system. Also, at this time, the Time of Day/Date alarm Flag, TDF, will be set, indicating that a wake
up condition has occurred.
If V
BAUX
is present, while V
CC
is low, the
KS
input pin will be monitored for a low going transition of
minimum pulse width t
KSPW
. When such a transition is detected, the
PWR
line will be pulled low, as it is
for a wake up condition. Also at this time, the Kickstart Flag KSF will be set, indicating that a kickstart
condition has occurred. The
KS
input pin is always enabled and must not be allowed to float.
The timing associated with both the wake up and kickstarting sequence is illustrated in the Wake
Up/Kickstart Timing Diagram, Figure 3. The timing associated with these functions is divided into
5 intervals, labeled 1-5 on the diagram.
The occurrence of either a kickstart or wake up condition will cause the
PWR
pin to be driven low, as
described above. During interval 1, if the supply voltage on the DS1501/DS1511 V
CC
pin rises above V
SO
before the power on timeout period (t
POTO
) expires, then
PWR
will remain at the active low level. If V
CC
does not rise above the V
SO
in this time, then the
PWR
output pin will be turned off and will return to its
high impedance level. In this event, the
IRQ
pin will also remain tri-stated. The interrupt flag bit (either
TDF or KSF) associated with the attempted power on sequence will remain set until cleared by software
during a subsequent system power on.
If V
CC
is applied within the time-out period, then the system power on sequence will continue as shown in
intervals 2-5 in the timing diagram. During interval 2,
PWR
will remain active and
IRQ
will be driven to
its active low level, indicating that either TDF or KSF was set in initiating the power on. In the diagram
KS
is assumed to be pulled up to the V
BAUX
supply. Also at this time, the PAB bit will be automatically
cleared to "0" in response to a successful power on. The
PWR
line will remain active as long as the PAB
remains cleared to "0".
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| DS1501WS | Real-Time Clock |
| DS1501Y | Real-Time Clock |
| DS1501YE | Real-Time Clock |
| DS1501YS | Real-Time Clock |
| DS1501 | Y2K-Compliant Watchdog Real-Time Clocks |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS1501WE/T&R | 制造商:Maxim Integrated Products 功能描述:IC RTC WDOG Y2KC 3.3V 28-TSOP |
| DS1501WE/T&R | 功能描述:實時時鐘 Y2K-Compliant Watchdog 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(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| DS1501WE/T&R/C02 | 功能描述:實時時鐘 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(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| DS1501WE/TR | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Y2K-Compliant Watchdog Real-Time Clocks |
| DS1501WE+ | 功能描述:實時時鐘 Y2K-Compliant Watchdog 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(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
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