Does the CPU start, if you reset it while keeping the power on? If so, most=
 likely the problem is slow rise time.

Sent from my phone

> On Jun 23, 2014, at 22:42, "Jahn" <jana1972@centrum.cz> wrote:
>=20
> I have a Linux embeded board that  uses=20
> FP6116 Asynchronous Step-Down Regulator=20
> a datasheet  is here
> http://www.micro-bridge.com/data/Feeling-tech/FP6116.pdf
>=20
> In this design , that Asynchronous Step-Down Regulator  should supply 1,2=
V for  CPU  on=20
> this board.
> It worked for some time but now it stopped.
> So, I measured voltage and that Asynchronous Step-Down Regulator  still s=
upply 1.2V, yet=20
> CPU does not start.
> But when I use a different source of 1.2V, the CPU starts.
> So, I am rather confused.
> I can measure the same voltages, and more or less the same spikes( using =
oscilloscope), yet=20
> different results.
>=20
> Can anyone suggest any solution to that problem?
> Thanks
> --=20
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--=20
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