dont-smoke.patch / Gold cap possibilities

[joerg]

Am Di  25. März 2008 schrieb Andy Green:
> - gpg control packet
> Somebody in the thread at some point said:
> > Am Di  25. März 2008 schrieb Andy Green:
> >>> Shouldn't we have a goldcap parallel to (maybe removed) battery, to 
buffer
> >>> spikes?
> >> It's quite a little area of physical space,
> >
> > Yep, those aren't THAT small.
> >
> >> and I pulled the battery
> >> many times and it never made a crash, the PMU is pretty decent at
> >> handling that.
> >
> > I thought of spikes above 100mA when booting without bat. And this
> 
> You mean that we boot without battery and then we add a battery?  I
> don't quite know the response of the PMU in detail but I do know it
> won't crash the CPU.  That has to mean it dynamically manages where it
> gets the power from very well, that's why the goldcap is more of a
> feature I think.

No, I just want to relief stress of >100mA from USB-bus, when booting without 
battery. Maybe even enabling to start up the device at all (for 50633 should 
simply reset the whole device when it demands >0.1A and there's no bat to 
help it out. A correct working and configured PMU never shall ask more than 
100 from USB, until allowed 500). The goldcap shall provide the excess power 
for 1 sec or 2, like the battery would do normally, when there are spikes in 
power consumption. 
Furthermore I think I've seen a goldcap in parallel to bat in some of the 
datasheets - maybe 50606?


> >> Whether it makes a "feature" if the phone suspended on battery removal,
> >> survived for 20 seconds on the goldcap so you can swap the battery and
> >> resume, I dunno.
> >
> > I think it's cool :-)
> 
> Yes it does provide a new way for the user, access to internal devices
> without reset ... if you are quick :-)

And if GTA02 with hand built in goldcap plus R/D is quick in detecting bat 
removal.

jOERG