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Michael Karas
11/29/11 21:33
Read: 431 times
Beaverton Or
USA


 
#184950 - Why Ask???
Responding to: ???'s previous message
Why ask what chip to use? The MAX701 has already been suggested to you. See -

http://www.8052.com/forum/read/184937

If for some reason you cannot really find the data sheet for this the Maxim part numbers for DIP-8 packages are:

MAX701CPA
MAX701EPA

These parts are readily available in the US from web order distributors. In small quantity they are a bit spendy but are a good part for use on 5V VCC systems.

A nice feature of the MAX701 is that it offers reset on two pins, one a high true reset and the other a low true reset. In addition to that there is an input to which you can connect your reset switch.

You may also want to consider the DS1232 also readily available with the same features as the MAX701 but with an added WDT (watch dog timer) which can be helpful if your MCU happens to be exposed to excessive noise that could cause your firmware to crash. The DS1232 retails here in small quantity for about half of what you would expect to pay for the MAX701 but with the DS1232 you have to deal with the WDT even if you did not want that function and there is an extra tolerance select pin (TOL) that you may need to be concerned about setting appropriate to your system needs.

Michael Karas




List of 25 messages in thread
TopicAuthorDate
P89V51RD2 And Flash Magic      Arif Deshmukh      11/26/11 18:48      
   please suggest      Andy Neil      11/26/11 23:27      
   reset button      Jan Waclawek      11/27/11 01:52      
      Reset Button      Arif Deshmukh      11/27/11 09:26      
         reset circuit      Jan Waclawek      11/27/11 13:04      
            That's the fundamental flaw with RC resets!      Andy Neil      11/28/11 14:40      
   Use a MAX700      Matthias Arndt      11/29/11 00:15      
      Rest supervisor        Steve M. Taylor      11/29/11 03:56      
         How Many Times      Michael Karas      11/29/11 05:03      
            This will continue until ...      Richard Erlacher      11/29/11 15:08      
               Power dip      Per Westermark      11/30/11 05:01      
                  real, but worse if flash      Erik Malund      11/30/11 07:17      
                  note, that here the main problem is NOT power related...      Jan Waclawek      11/30/11 07:17      
                     Yes      Per Westermark      11/30/11 07:42      
                        the ultimate joke      Erik Malund      11/30/11 08:20      
                           SiLabs watchdog      Andy Peters      11/30/11 09:25      
                              clarification      Erik Malund      11/30/11 09:43      
                                 Beware flash erase time      Maarten Brock      12/01/11 10:03      
                           brownout detection      Maarten Brock      12/01/11 10:07      
                              well,      Erik Malund      12/01/11 10:09      
                  It's not the spec's ... it's the lack of them.      Richard Erlacher      11/30/11 12:43      
   Reset Chip?      Arif Deshmukh      11/29/11 21:04      
      Why Ask???      Michael Karas      11/29/11 21:33      
         Thanks      Arif Deshmukh      11/30/11 00:29      
            a plethora of possible chips      Erik Malund      11/30/11 07:19      

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