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参数资料
| 型号： | MAX6814XK+T |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 模拟信号调理 |
| 英文描述： | 5-Pin Watchdog Timer Circuit |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PDSO5 |
| 封装： | SC-70, 5 PIN |
| 文件页数： | 5/6页 |
| 文件大小： | 631K |
| 代理商： | MAX6814XK+T |
MAX6814
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
VCC
VUVLO
WDO
tPP
Figure 2. Power-Up Timing Diagram
VCC
tWD
tPP
VUVLO
WDI
WDO
Figure 3. Watchdog Timing Relationship
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX6815LEUS | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX6815LEUS-T | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX6815MEUS | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX6815MEUS-T | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX6815REUS | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
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