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参数资料
| 型号： | DS17885E-3 |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | Timer or RTC |
| 英文描述： | 1 TIMER(S), REAL TIME CLOCK, PDSO28 |
| 封装： | TSOP-28 |
| 文件页数： | 16/35页 |
| 文件大小： | 662K |
| 代理商： | DS17885E-3 |
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The timing associated with both the wake-up and kick-
starting sequences is illustrated in the Wake-
Up/Kickstart Timing Diagram (Figure 6). The timing
associated with these functions is divided into five inter-
vals, labeled 1 to 5 on the diagram.
The occurrence of either a kickstart or wake-up condition
causes the PWR pin to be driven low, as described
above. During interval 1, if the supply voltage on the
DS17x85/DS17x87 VCC pin rises above the greater of
VBAT or VPF before the power-on timeout period (tPOTO)
expires, then PWR remains at the active-low level. If VCC
does not rise above the greater of VBAT or VPF in this
time, then the PWR output pin is turned off and returns to
its high-impedance level. In this event, the IRQ pin also
remains tri-stated. The interrupt flag bit (either WF or KF)
associated with the attempted power-on sequence
remains set until cleared by software during a subse-
quent system power-on.
If VCC is applied within the timeout period, then the sys-
tem power-on sequence continue as shown in intervals
2 to 5 in the timing diagram. During interval 2, PWR
remains active and IRQ is driven to its active-low level,
indicating that either WF or KF 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 is
automatically cleared to 0 in response to a successful
power-on. The PWR line remains active as long as the
PAB remains cleared to 0.
DS17285/DS17287/DS17485/DS17487/DS17885/DS17887
Real-Time Clocks
____________________________________________________________________
23
Figure 6. Wake-Up/Kickstart Timing Diagram
Note: Wake-up/kickstart timeout is generated only when the oscillator is enabled and the countdown chain is not reset.
VBAT
VIH
tKSPW
tPOTP
VIH
1
2
3
45
VIL
HIGH-IMPEDANCE
VIL
VPF
0V
*CONDITION
VPF < VBAT
*THIS CONDITION CAN OCCUR WITH THE 3V DEVICE.
NOTE: THE TIME INTERVALS SHOWN ABOVE ARE REFERENCED IN THE WAKE-UP/KICKSTART SECTION.
*CONDITION
VBAT > VPF
WF/KF
(INTERNAL)
KS
PWR
IRQ
Table 6. Wake-Up/Kickstart Timing
(TA =+25°C)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Kickstart-Input Pulse Width
tKSPW
2s
Wake-Up/Kickstart Power-On
Timeout
tPOTO
2s
相关PDF资料 |
PDF描述 |
|---|---|
| DS17285-3 | 1 TIMER(S), REAL TIME CLOCK, PDIP24 |
| DS17885SN-5 | 1 TIMER(S), REAL TIME CLOCK, PDSO24 |
| DS17287-3 | 1 TIMER(S), REAL TIME CLOCK, PDIP24 |
| DS17487-5 | 1 TIMER(S), REAL TIME CLOCK, PDIP24 |
| DS17885-5 | 1 TIMER(S), REAL TIME CLOCK, PDIP24 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DS17885E-3+ | 功能描述:实时时钟 3V/5V RTC 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 |
| DS17885E3+W | 制造商:Maxim Integrated Products 功能描述:3 VOLT RTC 8K RAM TSOP WAIVER PBFRE - Rail/Tube |
| DS17885E3-W | 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 |
| DS17885E5 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Real-Time Clocks |
| DS17885E-5 | 功能描述:实时时钟 3V/5V RTC 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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