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參數(shù)資料
| 型號： | CAT1832Z-GT3 |
| 英文描述： | 5V and 3.3V Supply Monitor, Watchdog Timer, Manual Reset, with Active High & Low Resets |
| 中文描述： | 5V和3.3V電源監(jiān)視器，看門狗定時器，手動復位，與Active高 |
| 文件頁數(shù)： | 6/12頁 |
| 文件大?。?/td> | 326K |
| 代理商： | CAT1832Z-GT3 |
CAT1232, CAT1832
WATCHDOG TIMER AND ˉˉ INPUT
A watchdog timer stops and restarts a microprocessor
that has stopped proper operation or become “hung”.
The watchdog performs this function by monitoring the
ˉˉ input. After the reset outputs go inactive the ˉˉ
input must be strobed with a high-to-low signal
transition prior to the minimum watchdog timeout
period. However if the ˉˉ input is not strobed with a
high-to-low signal transition prior to a watchdog
timeout the reset outputs will become active for TRST
reseting and restarting the microprocessor. Once the
resets return to the inactive state the watchdog timer
restarts the process.
Watchdog Time-out Period (ms)
MIN
NOMINAL
62.5
150
250
600
500
1200
TD Voltage
Level
GND
Floating
V
CC
MAX
250
1000
2000
PBRST
3.3V
1
VCC
TD
2
ST
TOL
CAT1832
μP
3
4
RESET
GND
8
7
6
5
RESET
RESET
I/O
The TD input allows the user to select from three
predetermined watchdog timeout periods. Always use
the minimum timeout period to determine the required
frequency of ˉˉ high-to-low transitions and the
maximum to determine the time prior to the reset
outputs becoming active. ˉˉ pulse widths must be
20ns or greater.
Figure 4. CAT1832 Application Circuit:
Pushbutton Reset
The watchdog timer cannot be disabled. It must be
strobed with a high-to-low signal transition to avoid a
watchdog timeout and subsequent reset.
Figure 5. CAT1232LP Application Circuit: Watchdog Timer
PBRST
5V
1
10k
VCC
TD
2
ST
TOL
CAT1232LP
μP
Decoder
3
4
RESET
GND
8
7
6
5
RESET
MREQ
Address Bus
RESET
Figure 6. Timing Diagram: Pushbutton Reset
V
IH
V
IL
V
OH
V
OL
RESET
RESET
PBRST
t
PDLY
t
PB
t
RST
RESET
RESET
ST
Valid
Strobe
Valid
Strobe
Invalid
Strobe
t
RST
t
ST
t
(Min)
t
(Min)
Note: ST is ignored whenever a reset is active
Figure 7. Timing Diagram: Strobe Input
Doc. No. MD-3018 Rev. D
6
Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| CAT1832Z-T3 | 功能描述:監(jiān)控電路 3.3 V 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 人工復位:Resettable 監(jiān)視器:No Watchdog 電池備用開關:No Backup 上電復位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| CAT-1976458-1 | 制造商:Samtec Inc 功能描述:CAT - Bulk |
| CAT-1976969-1 | 制造商:Samtec Inc 功能描述:CAT - Bulk |
| CAT-20-PP | 功能描述:INSTALL TOOL ORANGE FOR SHR SER RoHS:是 類別:工具 >> 螺線形繞線，伸縮套管 系列:- 標準包裝:1 系列:Slit-N-Wrap® |
| CAT-20-PP-BU | 功能描述:INSTALL TOOL ORANGE FOR SHR SER RoHS:是 類別:工具 >> 螺線形繞線，伸縮套管 系列:- 標準包裝:1 系列:Slit-N-Wrap® |
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