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Realtime clock on Cerberus? How to probe?


#1

Documentation says:

Two questions:

  1. What if it is not working, and you call Realtime.SetDateTime(xxx)? My experience is that it hangs…can I check before the call, or is this unintentionally…

  2. How it is possible for any human being to solder a crystal between two tiny caps 6 mm from the MCU? Any tips and tricks or a realism-score would be great…?


#2

I can solder it blind folded :slight_smile: no really it is not that hard when using a pointy iron.


#3

I think you have started to use that term a little often recently…something going on in the bedroom?


#4

Don’t buy your soldering iron from a plumbers merchant :whistle:


#5

I soldered a crystal on that board, look for 2 little holes on the board (vias) bewteen the processor and the 2 caps. First apply some solder on the crystal legs and then solder them to the holes.

The major problem is that i had to remove those 2 caps because with the crystal, the board started to hang.
According to this post https://www.ghielectronics.com/community/forum/topic?id=6993&page=3#msg154508 the total capacitance of the two caps should match the capacitance of the crystal. In this case the 2 caps are 14pF and the crystal is 6pF, so something is not right on the documentation… in fact, removing the 2 caps and assuming 5pF for the traces, it matches the capacitance of the crystal…

If you have some, use plenty of flux and a decent iron tip.

After that hard work, i realise that the RTC doesn’t work, it always wake up after 1 minute (see my post https://www.ghielectronics.com/community/forum/topic?id=16978), so good luck and let me know if you make it work.