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参数资料
| 型号： | DS1500W |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | Timer or RTC |
| 英文描述： | REAL TIME CLOCK, PDIP32 |
| 封装： | DIP-32 |
| 文件页数： | 25/25页 |
| 文件大小： | 214K |
| 代理商： | DS1500W |
DS1500/DS1510
9 of 25
The timing associated with both the wake up and kickstarting sequence is illustrated in the Wake
Up/Kickstart Timing Diagram, Figure 9, in the Electrical Specifications 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 condition will cause the PWR pin to be driven low, as
described above. During interval 1, if the supply voltage on the DS1500/DS1510 VCCI pin rises above the
greater of VBAT or VPF before the power on timeout period (tPOTO) expires, then PWR will remain at the
active low level. If VCCI does not rise above the greater of VBAT or VPF 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 VCCI 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 VBAUX 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".
At the beginning of interval 3, the system processor has begun code execution and clears the interrupt
condition of TDF and/or KSF by writing zeroes to both of these control bits. As long as no other interrupt
within the DS1500/DS1510 is pending, the IRQ line will be taken inactive once these bits are reset, and
execution of the application software may proceed. During this time, both the wakeup and kickstart
functions may be used to generate status and interrupts. TDF will be set in response to a day/date, hours,
minutes, and seconds match condition. KSF will be set in response to a low going transition on KS . If the
associated interrupt enable bit is set (TDE and/or KIE) then the IRQ line will be driven low in response to
enabled event. In addition, the other possible interrupt sources within the DS1500/DS1510 may cause IRQ
to be driven low. While system power is applied, the on chip logic will always attempt to drive the PWR
pin active in response to the enabled kickstart or wake up condition. This is true even if PWR was
previously inactive as the result of power being applied by some means other than wake up or kickstart.
The system may be powered down under software control by setting the PAB bit to a “1”. This causes the
open-drain PWR pin to be placed in a high impedance state, as shown at the beginning of interval 4 in the
timing diagram. As VCCI voltage decays, the IRQ output pin will be placed in a high impedance state when
VCCI goes below VPF. If the system is to be again powered on in response to a wake up or kickstart, then
both the TDF and KSF flags should be cleared and TPE and/or KIE should be enabled prior to setting the
PAB bit.
During interval 5, the system is fully powered down. Battery backup of the clock calendar and nonvolatile
RAM is in effect and IRQ is tri-stated, and monitoring of wake up and kickstart takes place. If PRS="1",
PWR
stays active, otherwise if PRS="0", PWR is tri-stated.
SQUARE WAVE OUTPUT
The square wave output is enabled and disabled via the E32K bit. If the square wave is enabled E32K ="0")
and the oscillator is running, then a 32.768 kHz square wave will be output on the SQW pin. If the Battery
Backup 32 kHz enable bit (BB32) is enabled, and voltage is applied to VBAUX, then the 32.768 kHz square
wave will be output on the SQW pin in the absence of VCCI.
相关PDF资料 |
PDF描述 |
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| DS1500WN | REAL TIME CLOCK, PDIP32 |
| DS1500YE | REAL TIME CLOCK, PDSO32 |
| DS1500YEN | REAL TIME CLOCK, PDSO32 |
| DS1500YN | REAL TIME CLOCK, PDIP32 |
| DS1501WN | 1 TIMER(S), REAL TIME CLOCK, PDIP28 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1500WE | 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 |
| DS1500WE+ | 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 |
| DS1500WEN | 功能描述:IC RTC Y2KC W/NV CTRL 32-TSOP RoHS:否 类别:集成电路 (IC) >> 时钟/计时 - 实时时钟 系列:- 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:- 类型:时钟/日历 特点:警报器，闰年，SRAM 存储容量:- 时间格式:HH:MM:SS（12/24 小时） 数据格式:YY-MM-DD-dd 接口:SPI 电源电压:2 V ~ 5.5 V 电压 - 电源，电池:- 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-WDFN 裸露焊盘 供应商设备封装:8-TDFN EP 包装:管件 |
| DS1500WEN+ | 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 |
| DS1500WN | 功能描述:IC RTC Y2KC W/NV CTRL 32-DIP RoHS:否 类别:集成电路 (IC) >> 时钟/计时 - 实时时钟 系列:- 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:- 类型:时钟/日历 特点:警报器，闰年，SRAM 存储容量:- 时间格式:HH:MM:SS（12/24 小时） 数据格式:YY-MM-DD-dd 接口:SPI 电源电压:2 V ~ 5.5 V 电压 - 电源，电池:- 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-WDFN 裸露焊盘 供应商设备封装:8-TDFN EP 包装:管件 |
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