[time-nuts] FE-5680 Linux command line tool

Joseph Gray jgray at zianet.com
Fri Oct 10 12:21:56 EDT 2014

I don't know how crowded the board is, but I would use an SMD DIP clip
instead of unsoldering the chip.

Joe Gray
 On Oct 10, 2014 8:30 AM, "Tom Wimmenhove" <tom.wimmenhove at gmail.com> wrote:

> I recently came across a thread on this list about undocumented FE5680
> commands. I have been using a little linux command line tool I wrote years
> ago for tuning the unit and decided to add these commands to it.
> Since this mailing list was the place I found the unit (someone linked to
> an ebay seller) I figured I' d join the list and throw it on here :)
> http://www.tomwimmenhove.com/otherstuff/fe5680-0.2.tgz
> Now, the bad news. I had my unit running overnight while logging the serial
> command output that reads the ADC, and in the morning it was no longer
> locked. The 10MHz signal disappears about 5 seconds after power-on, and
> programmed offset was somehow reset to zero (it had been set to -645). So
> it appears as if the internal EEPROM has been corrupted.
> I read a post from Elio Corbolante where he posted EEPROM and firmware
> dumps. Anyone have any idea on how to re-write this firmware back into the
> EEPROM by hand (would this be possible through JTAG, or do I actually have
> to solder the chip out of there? :) ) Or maybe there's someone willing to
> sell their broken unit I could take the chip out of?
> Regards,
> Tom
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