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參數(shù)資料
| 型號(hào)： | MAX6814XK-T |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 模擬信號(hào)調(diào)理 |
| 英文描述： | 5-Pin Watchdog Timer Circuit |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PDSO5 |
| 封裝： | SC-70, 5 PIN |
| 文件頁(yè)數(shù)： | 4/6頁(yè) |
| 文件大?。?/td> | 631K |
| 代理商： | MAX6814XK-T |
M
5-Pin Watchdog Timer Circuit
4
_______________________________________________________________________________________
MAX6814
V
CC
WDI
GND
WDO
WDO PULSE
GENERATOR
WATCHDOG
TIMER
WATCHDOG
TRANSITION
DETECTOR
UVLO
Figure 1. Functional Diagram
_______________Detailed Description
Watchdog Input
In the MAX6814, the watchdog circuit monitors the μP’s
activity. If the μP does not toggle the watchdog input
(WDI) within t
WD
(1.6s),
WDO
asserts. The internal 1.6s
timer is cleared by either a
WDO
pulse or by toggling
WDI, which detects pulses as short as 50ns. While
WDO
is asserted, the timer remains cleared and does
not count. As soon as
WDO
is released, the timer starts
counting (Figure 3).
Disable the watchdog function by leaving WDI uncon-
nected or by three-stating the driver connected to WDI.
The watchdog input is internally driven low during the
first 7/8 of the watchdog timeout period and high for the
last 1/8 of the watchdog timeout period. When WDI is left
unconnected, this internal driver clears the 1.6s timer
every 1.4s. When WDI is three-stated or unconnected,
the maximum allowable leakage current is 10μA and the
maximum allowable load capacitance is 200pF.
Applications Information
Watchdog Input Current
The MAX6814 WDI inputs are internally driven through
a buffer and series resistor from the watchdog counter
(Figure 1). When WDI is left unconnected, the watch-
dog timer is serviced within the watchdog timeout peri-
od by a low-high-low pulse from the counter chain. For
minimum watchdog input current (minimum overall
power consumption), leave WDI low for the majority of
the watchdog timeout period, pulsing it low-high-low
once within the first 7/8 of the watchdog timeout period
to clear the watchdog timer. If WDI is externally driven
high for the majority of the timeout period, up to 160μA
can flow into WDI.
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| 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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