[time-nuts] Ublox 8T - breakout board

[paul swed]

Hello to the group Nigel is correct the way the schematic is drawn the
Regulator will feed the battery and most likely cause it to burst.
It should be 1 diode in series with the regulator and 1 in series with the
battery so that the regulator can not charge the battery.
Nice design you have created.
Regards
Paul
WB8TSL

On Tue, Dec 15, 2020 at 11:55 AM Nigel gm8pzr via time-nuts <
time-nuts at lists.febo.com> wrote:

> Hi Mathias,
> I'm assuming you're using a coin cell for back up, so wondering if one of
> the diodes shouldn't be in series with the battery, with both cathodes to
> V_BCKP?
> Nigel GM8PZR
>
>
> I've updated the repository on github with the latest design files. The
> breakout board is now final as far as I'm concerned.
>
> I managed to implement all the requested features, this includes the
> backup
> battery and also the buffered PPS output with SMA footprint.
>
> Next step on my side will be to order a small batch of PCBs. There's not
> much
> on them and I guess I will end up with around 25? for 5 boards fully
> assembled, shipping not included.
>
> I eventually removed the I2C pull-ups again, thanks to Patrick Tudor for
> the
> hint. The footprints are still there, I only removed them from the BOM.
>
> Schematic and a screenshot of the top and bottom sides attached.
>
> BR,
> Matthias
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