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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)： | 2/30頁 |
| 文件大?。?/td> | 291K |
| 代理商： | DS1501WE |
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DS1501/DS1511
2 of 30
PIN DESCRIPTION
V
CC
A0-A4
DQ0-DQ7
CE
OE
WE
IRQ
PWR
- Supply Voltage
- Address Inputs
- Data I/O
- Chip Enable Input
- Output Enable Input
- Write Enable Input
- Interrupt Output (Open Drain)
- Power-On Output (Open Drain)
- Reset Output (Open Drain)
- Kickstart Input
- Square Wave Output
- Backup Battery Supply
- Auxiliary Battery Supply
- 32.768 kHz Crystal Pins
- Ground
- No Connection
RST
KS
SQW
V
BAT
V
BAUX
X1, X2
GND
NC
DESCRIPTION
The DS1501/DS1511 is a full function, year 2000-compliant, real-time clock/calendar (RTC) with a RTC
alarm, watchdog timer, power-on reset, battery monitors, 256 bytes nonvolatile static RAM, and a
32.768 kHz output. User access to all registers within the DS1501 is accomplished with a bytewide
interface as shown in Figure 1. The RTC registers contain century, year, month, date, day, hours,
minutes, and seconds data in 24-hour BCD format. 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. When the crystal oscillator is turned on, the internal set of registers are
continuously updated; this occurs regardless of external register settings to guarantee that accurate RTC
information is always maintained.
The DS1501/DS1511 contains its own power fail circuitry which automatically deselects the device when
the V
CC
supply falls below a power fail trip point. This feature provides a high degree of data security
during unpredictable system operation brought on by low V
CC
levels
The DS1501/DS1511 has interrupt (
IRQ
), power control (
PWR
), and reset (
RST
) outputs which can be
used to control CPU activity. The
IRQ
interrupt or
RST
outputs can be invoked as the result of a time of
day alarm, CPU watchdog alarm, or a kick start signal. The DS1501/1511 power control circuitry allows
the system to be powered on via an external stimulus, such as a keyboard or by a time and date (wake-up)
alarm. The
PWR
output pin can be triggered by one or either of these events, and can be used to turn on
an external power supply. The
PWR
pin is under software control, so that when a task is complete, the
system power can then be shut down. The DS1501/DS1511 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 DS1501 is a clock/calendar chip with the features described above. An external crystal and battery
are the only components required to maintain time-of-day and memory status in the absence of power.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 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: 安裝風格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
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