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參數(shù)資料
| 型號(hào)： | DS1238A |
| 英文描述： | CAP 3.0UF 250VAC METALLIZED POLY |
| 中文描述： | 微管理器芯片 |
| 文件頁數(shù)： | 8/13頁 |
| 文件大小： | 211K |
| 代理商： | DS1238A |
DS1238A
8 of 13
POWER SWITCHING
Figure 8
Note: If freshness on the DS1238A is not used,
PF
on the DS1336 may be tied to OUT1. This will free IN4, OUT4,
and V
BAT01
for system use.
TIMING DIAGRAMS
This section provides a description of the timing diagrams shown in Figure 9 and Figure 10. Figure 9
illustrates the relationship for power down. As V
CC
falls, the IN pin voltage drops below V
TP
. As a result,
the processor is notified of an impending power failure via an active
NMI
. This gives the processor time
to save critical data in nonvolatile SRAM. As the power falls further, V
CC
crosses V
CCTP
, the power
monitor trip point. When V
CC
reaches V
CCTP
, and active RST and
RST
are given. At this time,
CEO
is
brought high to write-protect the RAM. When the V
CC
reaches V
BAT
, a power-fail is issued via the PF
pin.
Figure 10 shows the power-up sequence. As V
CC
slews above V
BAT
, the PF pin is deactivated. An active
reset occurs as well as an
NMI
. Although the
NMI
may be short due to slew rates, reset will be
maintained for the standard t
RPU
timeout period . At a later time, if the IN pin falls below V
TP
, a new
NMI
will occur. If the processor does not issue an
ST
, a watchdog reset will also occur. The second
NMI
and
RST are provided to illustrate these possibilities.
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PDF描述 |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS1238A-10 | 功能描述:監(jiān)控電路 RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| DS1238A-10+ | 功能描述:監(jiān)控電路 RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| DS1238A10N | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog IC |
| DS1238A-10N | 功能描述:監(jiān)控電路 RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| DS1238A-10N+ | 功能描述:監(jiān)控電路 RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
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