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參數(shù)資料
| 型號(hào)： | CAT1232LPZ |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO8 |
| 封裝： | GREEN, MSOP-8 |
| 文件頁(yè)數(shù)： | 6/9頁(yè) |
| 文件大小： | 179K |
| 代理商： | CAT1232LPZ |
6
CAT1232LP/CAT1832
Doc. No. 25089, Rev. B
2006 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
WATCHDOG TIMER AND
ST
ST 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
ST input. After the reset outputs go inactive the ST input
must be strobed with a high-to-low signal transition prior
to the minimum watchdog timeout period. However if the
ST input is not strobed with a high-to-low signal transi-
tion 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.
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
ST high-to-low transitions and the maxi-
mum to determine the time prior to the reset outputs
becoming active.
ST pulse widths must be 20ns or
greater.
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 6. Timing Diagram: Pushbutton Reset
VIH
VIL
VOH
VOL
RESET
PBRST
tPDLY
tPB
tRST
RESET
ST
Valid
Strobe
Valid
Strobe
Invalid
Strobe
tRST
tST
Note:ST is ignored whenever a reset is active.
tTD
(Min)
tTD
(Min)
Figure 4. CAT1832 Application Circuit:
Pushbutton Reset
Figure 7. Timing Diagram: Strobe Input
Figure 5. CAT1232LP Application Circuit: Watchdog Timer
PBRST
3.3V
1
VCC
TD
2
ST
TOL
CAT1832
P
3
4
RESET
GND
8
7
6
5
RESET
I/O
PBRST
5V
1
10k
VCC
TD
2
ST
TOL
CAT1232LP
P
Decoder
3
4
RESET
GND
8
7
6
5
RESET
MREQ
Address
Bus
RESET
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| CAT1232LPZ-G | 制造商:ON Semiconductor 功能描述:SUPERVISOR, 5 V - Rail/Tube |
| CAT1232LPZ-GT3 | 功能描述:監(jiān)控電路 SUP 5 V 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 |
| CAT12787 | 制造商: 功能描述: 制造商:undefined 功能描述: |
| CAT130019SWGI | 制造商:Catalyst Semiconductor 功能描述: |
| CAT130019SWI-G | 功能描述:監(jiān)控電路 2.93V, 1K EEPROM, Active Low 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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