[time-nuts] Motorola Oncore UT+ firmware upgrade & backup power questions

paul swed paulswedb at gmail.com
Sun Mar 15 11:05:53 EDT 2015

I agree with Atilla from what I have seen. Its actually somewhat difficult
to measure this level of current. But all is not lost. Even if the unit is
drawing 1-10ua because something is going wrong. Simply add a battery
holder and 2 X AAA or AA or ...
Whatever it takes to keep the unit going.
If you mount the batteries externally you can easily replace them and check
the discharge rate.
Its a way around the problem if you simply can not get a replacement or its
totally embedded on the board.
Best of luck

On Sun, Mar 15, 2015 at 6:27 AM, Hal Murray <hmurray at megapathdsl.net> wrote:

> attila at kinali.ch said:
> > A CR2032 is a quite huge coin cell. An NVRAM module does not use much
> power
> > once Vcc goes to zero. In todays low power modules it's in the order of
> > 100nA max specified. You can assume it to be somewhere in the range of
> 10nA
> > (probably package leakage limited) and 1uA (something has gone wrong or
> very
> > old module). ...
> GPS also needs the time, so add on a 32KHz clock.
> --
> These are my opinions.  I hate spam.
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