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參數(shù)資料
| 型號(hào)： | CAT813ZI-GT3 |
| 元件分類(lèi)： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO8 |
| 封裝： | 3 X 3 MM, ROHS COMPLIANT, MO-187, MSOP-8 |
| 文件頁(yè)數(shù)： | 13/14頁(yè) |
| 文件大?。?/td> | 374K |
| 代理商： | CAT813ZI-GT3 |
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CAT705, CAT706, CAT813
Doc. No. MD-3030 Rev. A
8
Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
WATCHDOG TIMER
The CAT705, CAT706, & CAT813 provide a
Watchdog input (WDI). The watchdog timer function
forces RESET
(and RESET in the CAT813) signals
active when the WDI input does not have a transition
from low-to-high or high-to-low within 1.12 seconds.
Timeout of the watchdog starts when RESET
(RESET
on the CAT813) becomes inactive.
If a transition
occurs on the WDI input pin prior to the watchdog
time-out, the watchdog timer is reset and begins to
time-out again. If the watchdog timer is allowed to
time-out, then the reset output(s) will go active for tRP
and once released will repeat the watchdog timeout
process.
Figure 3 below shows a typical implementation of a
watchdog function. Any processor signal that repeats
dependant on the normal operation of the processor
or directed by the software operating on the processor
can be used to strobe the watchdog input. The most
reliable is a dedicated I/O output transitioned by a
specific software instruction.
The watchdog can be disabled by floating (or tri-
stating) the WDI input (see Figure 4). If the watchdog
is disabled the WDI pin will be pulled low for the first
7/8
th’s of the watchdog period (t
WD) and pulled high for
the last 1/8
th of the watchdog period. This pulling low
of the WDI input and then high is used to detect an
open or tri-state condition and will continue to repeat
until the WDI input is driven high or low.
For most efficient operation of devices with the
watchdog function the WDI input should be held low
the majority of the time and only strobed high as
required to reset the watchdog timer.
PIC
C
DECODER
ADDRESS
MCLR
WDO
PFO
VCC
WDI
GND
PFI
MR
RESET/RESET
CAT705
CAT706
CAT813
Figure 3. Watchdog Timer
Figure 4. Watchdog Disable Circuit
C
OUTPUT
VCC
Tristate
150k
110k
WDO
PFO
VCC
WDI
GND
PFI
MR
RESET/RESET
CAT705
CAT706
CAT813
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| CAT823 | 制造商:ONSEMI 制造商全稱(chēng):ON Semiconductor 功能描述:System Supervisory Voltage Reset with Watchdog and Manual Reset |
| CAT823_08 | 制造商:CATALYST 制造商全稱(chēng):Catalyst Semiconductor 功能描述:System Supervisory Voltage Reset with Watchdog and Manual Reset |
| CAT823LSDI-G | 制造商:CATALYST 制造商全稱(chēng):Catalyst Semiconductor 功能描述:System Supervisory Voltage Reset with Watchdog and Manual Reset |
| CAT823LSDI-GT3 | 功能描述:監(jiān)控電路 Push-Pull Low 247mW 1.2V to 5.5V RoHS:否 制造商:STMicroelectronics 監(jiān)測(cè)電壓數(shù): 監(jiān)測(cè)電壓: 欠電壓閾值: 過(guò)電壓閾值: 輸出類(lèi)型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開(kāi)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 |
| CAT823LTDI-G | 制造商:CATALYST 制造商全稱(chēng):Catalyst Semiconductor 功能描述:System Supervisory Voltage Reset with Watchdog and Manual Reset |
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