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参数资料
| 型号： | DS1511 |
| 厂商： | Maxim Integrated Products, Inc. |
| 英文描述： | Y2KC Watchdog Real Time Clock(Y2KC看门狗实时时钟) |
| 中文描述： | Y2K兼容、看门狗实时时钟 |
| 文件页数： | 8/22页 |
| 文件大小： | 178K |
| 代理商： | DS1511 |
DS1501/DS1511
071098 8/22
IRQ AND FLAG WAVEFORMS
Figure 2b
A0–A4
IRQ
ADDRESS 0Eh
15 ns MIN
HIGH–Z
OE
ACTIVE FLAG BIT(S)
WAKE UP/KICKSTART
The DS1501/DS1511 incorporates a wake up feature
which can power on at a pre–determined date through
activation of the PWR output pin. In addition, the kick-
start feature can allow the system to be powered up in
response to a low going 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 modem ring detect signal. In order to use
either the wake up or the kickstart features, the
DS1501/DS1511 must have a battery connected to the
V
BAUX
pin and the oscillator must be running.
The wake up feature is controlled through the Time of
Day/Date Alarm Power Enable bit ‘TPE’ in Control B
register (B4 of 0Fh). Setting TPE to “1” enables the
wake up feature, clearing TPE to “0” disables it. Simi-
larly, the kickstart feature is controlled through the Kick-
start Interrupt Enable bit ‘KIE’ in Control B register (B2 of
0Fh).
A wake up sequence will occur as follows: When wake
up is enabled via TPE = “1” 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 (Time of Day/Date alarm In-
terrupt Enable bit) (B3 of 0Fh). When the match condi-
tion occurs, the PWR pin will automatically be driven
low. This output can be used to turn on the main system
power supply which provides V
CC
voltage to the
DS1501/DS1511 as well as the other major compo-
nents in the system. Also, at this time, the Time of Day/
Date alarm Flag will be set, indicating that a wake up
condition has occurred.
While the system is powered down, 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 condi-
tion. Also at this time, the Kickstart Flag (KSF, register
0Eh) will be set, indicating that a kickstart condition has
occurred.
The timing associated with both the wake up and kick-
starting sequences is illustrated in the Wake Up/Kick-
start Timing Diagram, Figure 8, in the Electrical Specifi-
cations section of this datasheet. 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 condi-
tion 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 the battery
switch voltage (V
SW
) 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 battery
switch voltage (V
SW
) in 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 subse-
quent
power on.
system
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1511FP000 | 制造商:Thomas & Betts 功能描述:100A,CON,4P5W,MG,511,220V |
| DS1511MR000 | 制造商:Thomas & Betts 功能描述:100A,NLT,4P5W,MG,511,220V |
| DS1511W | 功能描述:实时时钟 RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
| DS1511W+ | 功能描述:实时时钟 Y2K-Compliant Watchdog RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
| DS1511Y | 功能描述:实时时钟 RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
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