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參數(shù)資料
| 型號(hào)： | MAX6814 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 5-Pin Watchdog Timer Circuit |
| 中文描述： | 5引腳、看門狗定時(shí)器電路 |
| 文件頁數(shù)： | 5/6頁 |
| 文件大?。?/td> | 631K |
| 代理商： | MAX6814 |
M
5-Pin Watchdog Timer Circuit
_______________________________________________________________________________________
5
____________________Chip Information
TRANSISTOR COUNT: 607
PROCESS: BiCMOS
Watchdog Software Considerations
One way to help the watchdog timer monitor software
execution more closely is to set and clear the watchdog
input at different points in the program, rather than
pulsing the watchdog input high-low-high or low-high-
low. This technique avoids a stuck loop, in which the
watchdog timer would continue to be cleared inside the
loop, keeping the watchdog from timing out.
Figure 4 shows an example of a flow diagram where
the I/O driving the watchdog input is set high at the
beginning of the program, set low at the beginning of
every subroutine or loop, then set high again when the
program returns to the beginning. If the program
should hang in any subroutine, the problem would
quickly be corrected, since the I/O is continually set low
and the watchdog timer is allowed to time out, causing
an interrupt to be issued. This scheme results in higher
time average WDI input current than does leaving WDI
low for the majority of the timeout period and periodi-
cally pulsing it low-high-low (see the
Watchdog Input
Current
section).
START
SET WDI
HIGH
PROGRAM
CODE
SUBROUTINE OR
PROGRAM LOOP
SET WDI LOW
RETURN
Figure 4. Watchdog Flow Diagram
V
CC
V
UVLO
V
UVLO
WDO
t
PP
Figure 2. Power-Up Timing Diagram
V
CC
t
WD
t
PP
t
PP
V
UVLO
WDI
WDO
Figure 3. Watchdog Timing Relationship
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PDF描述 |
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| MAX6814XK-T | 5-Pin Watchdog Timer Circuit |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX6814EVKIT# | 制造商:Maxim Integrated Products 功能描述:EVKIT FOR 5-PIN WATCHDOG TIMER CIRCUIT - Boxed Product (Development Kits) 制造商:Maxim Integrated Products 功能描述:EVAL KIT FOR MAX6814 |
| MAX6814XK | 制造商:Maxim from Components Direct 功能描述:MAXIM MAX6814XK, SUPERVISORS - Boxed Product (Development Kits) 制造商:Maxim Integrated Products 功能描述:5-PIN WATCHDOG TIMER CIRCUIT - Rail/Tube 制造商:Maxim 功能描述:Maxim MAX6814XK, Watchdog Timer Circuit 2.25V-5.5V 5-pin SC70 |
| MAX6814XK+ | 制造商:Maxim Integrated Products 功能描述:PROCESSOR SUPERVISOR 10UA - Rail/Tube |
| MAX6814XK+T | 功能描述:監(jiān)控電路 5-Pin Watchdog Timer Circuit 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 |
| MAX6814XK-T | 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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