There is no pin-compatible replacement processor, at least not in a compatible package. I could use a C8051F300 which is available in a 14 pin SO package, but I have not had time to switch the software over to that chip. It would not be too hard to wire the SO-14 package to an existing board designed for the DIP packaged C8051F330. The chip only costs a few $.
If anyone wants to try, the software (source code and tools) is open source. All information is on my wiki page for the GPS Monitor. Follow that link: http://www.ko4bb.com/Timing/GPSMonitor/ Didier KO4BB On Wed, Jul 6, 2011 at 3:39 PM, Arthur Dent <[email protected]>wrote: > I seem to remember someone on this list posting that the original processor > was no longer available so this required a board change to accommodate a > new processor. I think the new processor also requires 3.3vdc but if you > Google the chip's part number I'm sure you can find all the specs and this > will answer your questions. > > If the new chip requires 3.3 vdc and there aren't 3 diodes on the board to > drop > the 5 vdc down, this will be a problem. The old board had 3 zero ohm > resistors > in place of the diodes and this is why some of the boards failed. As I had > posted previously, I used a red LED as a 1.7-1.8 volt zener to drop the 5 > volts > down to the proper value. The LED went in place of the 3 regular diodes. > > -Arthur > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
