參數(shù)資料
型號(hào): PCI-WDT
英文描述: UEBERWACHUNGSKARTE PLUG AND PLAY
中文描述: UEBERWACHUNGSKARTE即插即用
文件頁數(shù): 7/31頁
文件大?。?/td> 334K
代理商: PCI-WDT
Introduction
Blue Chip Technology Ltd.
01270202.doc
Introduction
The PCI-WD is a PCI-compatible half-card which provides system monitoring
of system power supplies, fan operation, system temperature and Processor
activity and generates alarm functions in the event of a system malfunction.
The heart of the system monitoring is performed by the National Semiconductor
LM78 IC. This highly integrated devices performs the supply, fan and
temperature monitoring circuits as well interrupt generation.
Four PCI power rails ( +3.3V, +5V, +12V and -12V) can be monitored for over
and under voltage excursions. In the event of the rails drifting out specification
the system is notified.
Three fan speed counter circuits provide a warning to the system that fans are
operating out of specification. This function requires the use of Tacho pulse fans
which provide output pulses the frequency of which is proportional to the fan
speed. If the fan speed drops below predefined limits, the system is notified.
A programmable watchdog timer facilitates monitoring of application software
execution. This is achieved by the use of a timer which notifies the system on
the event of a time out. The user application must refresh this timer before the
count has expired indicating successful code execution. The timer is software
selectable between 1 and 255 seconds.
The PCI-WD has an onboard temperature monitor to notify the system that
temperature within the PC enclosure has risen past a prescribed level.
External events can be monitored through an isolated digital input. The input
voltage levels can range from -50V to + 50V with an input current level of
1mA. In the event of a state of change on this input the system is notified.
In response to any of the above monitoring circuits detecting an error or change
in condition, the system can generate a number of responses including
activating a relay, activating an on board audible alarm, illuminating an LED or
resetting the system. Each of the above responses can be enabled and disabled
under software control.
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