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参数资料
| 型号： | DS1501YSN |
| 厂商： | DALLAS SEMICONDUCTOR |
| 元件分类： | Timer or RTC |
| 英文描述： | 1 TIMER(S), REAL TIME CLOCK, PDSO28 |
| 封装： | 0.720 INCH, PLASTIC, SOIC-28 |
| 文件页数： | 2/30页 |
| 文件大小： | 291K |
| 代理商： | DS1501YSN |
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DS1501/DS1511
10 of 30
CLOCK ACCURACY
A standard 32.768 kHz quartz crystal should be directly connected to the DS1501 X1 and X2 oscillator
pins. The crystal selected for use should have a specified load capacitance (CL) of either 6 pF or 12.5 pF,
and the Crystal Select (CS) bit set accordingly. For more information on crystal selection and crystal
layout considerations, please consult Application Note 58, “Crystal Considerations with Dallas Real Time
Clocks.” The DS1501 can also be driven by an external 32.768 kHz oscillator. In order to achieve low
power operation when using an external oscillator, it may be necessary to connect the X1 pin to the
external oscillator signal through a series connection consisting of a resistor and a capacitor. A typical
configuration consists of a 1.0Meg resistor in series with a 100pf ceramic capacitor. When using an
external oscillator the X2 pin must be left open. Accuracy of DS1511 is better than ±1 min./month at
25°C.
USING THE CLOCK ALARM
The alarm settings and control for the DS1501/DS1511 reside within registers 08h - 0Bh (see Table 2).
The TIE bit and alarm mask bits AM1-AM4 must be set as described below for the IRQ or PWR outputs
to be activated for a matched alarm condition.
The alarm can be programmed to activate on a specific day of the month, day of the week, or repeat every
day, hour, minute, or second. It can also be programmed to go off while the DS1501/DS1511 is in the
battery-backed state of operation to serve as a system wake-up. Alarm mask bits AM1-AM4 control the
alarm mode. Table 3 shows the possible settings. Configurations not listed in the table default to the
once per second mode to notify the user of an incorrect alarm setting. When the RTC register values
match alarm register settings, the Time of Day/Date alarm Flag TDF bit is set to a "1". Once the TDF
flag is set, the TIE bit enables the alarm to activate the IRQ pin. The TPE bit enables the alarm flag to
activate the PWR pin.
ALARM MASK BITS Table 3
DY/DT
AM4
AM3
AM2
AM1
ALARM RATE
X
1
Once per Second
X
1
0
When seconds match
X
1
0
When minutes and seconds match
X
1
0
When hours, minutes, and seconds match
0
When date, hours, minutes, and seconds match
1
0
When day, hours, minutes, and seconds match
USING THE WATCHDOG TIMER
The watchdog timer can be used to restart an out-of-control processor. The watchdog timer is user
programmable in 10 milli-second intervals ranging from 0.01 seconds to 99.99 seconds. The user
programs the watchdog timer by setting the desired amount of time-out into the two BCD Watchdog
Registers (Address 0Ch and 0Dh). For example: writing 60h in the watchdog register 0Ch and 00h to
watchdog register 0Dh will set the watchdog time-out to 600 milli-seconds. If the processor does not
access the timer with a write within the specified period, both the Watchdog Flag WDF and the Interrupt
Request Flag IRQF will be set. If the Watchdog Enable bit WDE is enabled, then either IRQ or RST will
go active depending on the state of the Watchdog Steering Bit WDS. The watchdog will be reloaded and
restarted whenever the watchdog times out. The WDF bit will be set to a "1" regardless of the state of
WDE to serve as an indication to the processor that a watchdog time out has occurred.
相关PDF资料 |
PDF描述 |
|---|---|
| DS1511W | 1 TIMER(S), REAL TIME CLOCK, DMA28 |
| DS1511Y | 1 TIMER(S), REAL TIME CLOCK, DMA28 |
| DS1501YE | 1 TIMER(S), REAL TIME CLOCK, PDSO28 |
| DS1501WS | 1 TIMER(S), REAL TIME CLOCK, PDSO28 |
| DS1501Y | 1 TIMER(S), REAL TIME CLOCK, PDIP28 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1501YSN/T&R | 制造商:Maxim Integrated Products 功能描述:REAL TIME CLOCK PARALLEL 256BYTE 28SOIC - Tape and Reel |
| DS1501YSN+ | 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 |
| DS1501YSN+T&R | 制造商:Maxim Integrated Products 功能描述:IC RTC WDOG Y2K 5V IND 28-SOIC |
| DS1501YSN+T&R | 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 |
| DS1501YZ+ | 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 |
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