Topic for #qi-hardware is now Copyleft hardware - http://qi-hardware.com | hardware hackers join here to discuss Ben NanoNote, atben / atusb 802.15.4 wireless, and other community driven hw projects | public logging at http://en.qi-hardware.com/irclogs
<wolfspraul>
I'm almost calling it a day though...
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<rjeffries>
reading backlog. someone asked if I pimp qi-hardware in Raspberry Pi channel. A: NO. I was not promoting Raspberry Pi here, merely mentioning the release of board schematics (a Good Thing, IMO).
<rjeffries>
Not sure I understand the latent hostimity to a $35 computer that will run Linux. While not perfectly open, they have released datasheet on the SoC and now we see schematics. As best I can tell, they are not forcing people to purchase the board.
<rjeffries>
Why not let 1,000 flowers bloom? Raspberry Pi may well fail, if so, then it failed. It is not a threat to Ben Nanonote, rather it has very different target market.
<rjeffries>
Ben NN has been an interesting (ongoing experiment). I am not sure Raspberry Pi can not achive a similar level of open-ness as Ben NN. Both have published SoC datasheets.
<rjeffries>
The life forces of qi hardware have already shifted to Milkymist, which has promise, although it will never be a $35 system. Will Milkylist someday be converted to an ASIC? It could happen.
<rjeffries>
s/hostimity/hostility/
<DocScrutinizer>
what damn latent hostility?
<DocScrutinizer>
wpwrak: (precharge) hah, well you want some proper current limiters in a number of places
<DocScrutinizer>
wpwrak: and I don't think you could place "the capacitor to the right side of switch" here
<DocScrutinizer>
anyway we had sth similar with Vsys on GTA02, no? ;-D
<DocScrutinizer>
(current limiter) a LDO with /ENA input is probably the better alternative to a switch with current limiter
<DocScrutinizer>
this way you got a decent decoupling from system VDD by design
<DocScrutinizer>
and a LDO probably is even cheaper than a switch with current limiter
<DocScrutinizer>
of course this requires some power rail providing Uout + Udrop_LDO
<DocScrutinizer>
running a commerical device without any on-board power stabilization is ... a bit unusual. As are good stabilized 5V wallwart PSU
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<wpwrak>
DocScrutinizer: in GTA02, we solved the Vsys problem just by placing a cap on the other side of the switch :)
<wpwrak>
an LDO may be a bit inefficient. but yes, it's a possiblity, too.
<wpwrak>
just the absence of inrush current limiting is generally a bad idea, as we keep seeing :)
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<DocScrutinizer>
yup
<DocScrutinizer>
unless you have no separate power domains and a proper power-up sequence
<DocScrutinizer>
one of the main reasons for power-up sequences is to avoid such effects
<DocScrutinizer>
basically you can take a boader approach than "limiting inrush": always consider both ends of the rope
<wpwrak>
DocScrutinizer: power-up sequences don't help in this case - it's all hot-plugged
<wpwrak>
or at least can be hot-plugged. same worst case :)