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參數(shù)資料
| 型號： | DS1543 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 64K NV Timekeeping RAM(64K非易失性計時 RAM) |
| 中文描述： | 計時64K的非易失存儲器（64K的非易失性計時的RAM） |
| 文件頁數(shù)： | 2/19頁 |
| 文件大小： | 165K |
| 代理商： | DS1543 |
DS1543
070198 2/19
DESCRIPTION
The DS1543 is a full function real–time clock/calendar
(RTC) with a RTC alarm, watchdog timer, power–on
reset, battery monitor, and 8K x 8 non–volatile static
RAM. User access to all registers within the DS1543 is
accomplished with a bytewide interface as shown in Fig-
ure 1. The RTC registers contain year, month, date, day,
hours, minutes, and seconds data in 24 hour BCD for-
mat. Corrections for day of month and leap year are
made automatically.
The RTC registers are double buffered into an internal
and external set. The user has direct access to the
external set. Clock/calendar updates to the external set
of registers can be disabled and enabled to allow the
user to access static data. Assuming the internal oscil-
lator is turned on, the internal set of registers are contin-
uously updated; this occurs regardless of external reg-
isters settings to guarantee that accurate RTC
information is always maintained.
The DS1543 has interrupt (IRQ/FT) and reset (RST)
outputs which can be used to control CPU activity. The
IRQ/FT interrupt output can be used to generate an
external interrupt when the RTC register values match
user programmed alarm values. The interrupt is always
available while the device is powered from the system
supply and can be programmed to occur when in the
battery backed state to serve as a system wake–up.
Either the IRQ/FT or RST outputs can also be used as a
CPU watchdog timer, CPU activity is monitored and an
interrupt or reset output will be activated if the correct
activity is not detected within programmed limits. The
DS1543 power–on reset can be used to detect a system
power down or failure and hold the CPU in a safe reset
state until normal power returns and stabilizes; the RST
output is used for this function.
The DS1543 also contains its own power fail circuitry
which automatically deselects the device when the V
CC
supply enters an out of tolerance condition. This feature
provides a high degree of data security during unpre-
dictable system operation brought on by low V
CC
levels.
PACKAGES
The DS1543 is available in two packages (28–pin DIP
and 34–pin PowerCap module). The 28–pin DIP style
module integrates the crystal, lithium energy source,
and silicon all in one package. The 34–pin PowerCap
module board is designed with contacts for connection
to a separate PowerCap (DS9034PCX) that contains
the crystal and battery. This design allows the Power-
Cap to be mounted on top of the DS1543P after the
completion of the surface mount process. Mounting the
PowerCap after the surface mount process prevents
damage to the crystal and battery due to the high tem-
peratures required for solder reflow. The PowerCap is
keyed to prevent reverse insertion. The PowerCap
Module board and PowerCap are ordered separately
and shipped in separate containers. The part number
for the PowerCap is DS9034PCX.
DS1543 BLOCK DIAGRAM
Figure 1
CLWATCHDOG
COUNTDOWN
POWER CONTROL
WAND POWER–ON
RESET
16 x 8
CLOCK AND CONTROL
REGISTERS
8176 x 8
CE
WE
OE
V
CC
RST
IRQ/FT
A0–A12
DQ0–DQ7
32.768 KHz
V
BAT
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS1543-100 | 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 |
| DS1543-100+ | 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 |
| DS1543-70 | 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 |
| DS1543-85 | 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 |
| DS1543-85+ | 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 |
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