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- Path: sparky!uunet!stanford.edu!rutgers!news.columbia.edu!lamont!dale
- From: dale@ldgo.columbia.edu (dale chayes)
- Newsgroups: sci.electronics
- Subject: Re: Max699 ( what is this for? )
- Summary: Its a watchdog reset
- Message-ID: <1992Oct9.200859.28328@lamont.ldgo.columbia.edu>
- Date: 9 Oct 92 20:08:59 GMT
- References: <geb1.718651549@Isis.MsState.Edu>
- Sender: news@lamont.ldgo.columbia.edu
- Organization: Lamont-Doherty Geological Observatory
- Lines: 27
-
- In article <geb1.718651549@Isis.MsState.Edu>, geb1@ra.msstate.edu (Granville Barker) writes:
- > I was just wondering what a MAX 699 IC is used for?
- >
- > Thanks.
- > geb1@isis.msstate.edu
-
-
- From the Maxim 1992 "New Releases data book":
-
- "...monitors the +5VDC supply in processor and digital systems...
- supplys a !RESET pulse of ate least 140ms duration on power up, power-down,
- and during low voltage "brown out" conditions....also provides a "watchdog"
- input to monitor microsprocessor activity. The !RESET output goes low if
- the watchdog input (WDI) is not toggled within 1 second. The watchdoe feature
- can be disabled by leaving WDI open."
-
-
- One might use this in an embedded and/or real-time system to reduce the
- probability of having a system "wedged" by power problems. The WD feature
- provides a way to recover from a program that runs amuck.
-
- -Dale
-
- --
- Dale Chayes Lamont-Doherty Geological Observatory of Columbia University
- Route 9W, Palisades, N.Y. 10964 dale@lamont.ldgo.columbia.edu
- voice: (914) 359-2900 extension 434 fax: (914) 359-6940
-