How can they have a bare die on the PCB? Does it have clear encapsulation?

Still, my comments from the previous mail will still apply, any active devi=
ce on there will become a photodiode or phototransistor going into hyper co=
nduction with a xenon light flash.



> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf
> Of Robert Dvoracek
> Sent: 19 March 2015 04:56
> To: Microcontroller discussion list - Public.
> Subject: RE: [EE] Xenon flashes/long wave high-intensity light causes the
> Raspberry Pi 2 SMPS chip to glitch
>=20
> Yes, one of the ICs is bare die and light sensitive.
> A dab of opaque epoxy fixes that in a hurry.
>=20
> Cheers,
> Robert
>=20
> ----------------------------------------
> > Date: Thu, 19 Mar 2015 13:48:10 +1000
> > From: david@audiovisualdevices.com.au
> > To: piclist@mit.edu
> > Subject: Re: [EE] Xenon flashes/long wave high-intensity light causes
> > the Raspberry Pi 2 SMPS chip to glitch
> >
> > It is the flash of light and has had coverage in various forums
> > (EEVblog, etc). IIRC it's the reset chip that is the culprit.
> >
> > On 19/03/2015 1:38 PM, Randy Dawson wrote:
> >> I don't think it is the flash thats causing the micro to glitch, but
> >> the gnd/voltage spike it sees when the thyristor discharges the flash
> >> cap (a few hundred volts)
> >>
> >>> Date: Wed, 18 Mar 2015 23:44:04 -0300
> >>> Subject: Re: [EE] Xenon flashes/long wave high-intensity light
> >>> causes the Raspberry Pi 2 SMPS chip to glitch
> >>> From: daniel.serpell@gmail.com
> >>> To: piclist@mit.edu
> >>>
> >>> Hi!,
> >>>
> >>> On Wed, Mar 18, 2015 at 11:01 PM, V G <veegee@veegee.org> wrote:
> >>>> http://www.raspberrypi.org/xenon-death-flash-a-free-physics-lesson/
> >>>>
> >>>> Not sure if this has been posted here before, but I was looking to
> >>>> buy one of these today and came across this post.
> >>>
> >
> > --
> > ___________________________________________
> > David Duffy Audio Visual Devices P/L
> > Unit 8, 10 Hook St, Capalaba 4157 Australia
> > Ph: +61 7 38235717 Fax: +61 7 38234717 Our Web Site:
> > www.audiovisualdevices.com.au
> > ___________________________________________
> >
> > --
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>=20
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