--- crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68
On Tue, Dec 20, 2016 at 8:28 AM, mike.v...@gmail.com <mike.v...@gmail.com> wrote: > > 2016-12-19 22:56 GMT+01:00 Luke Kenneth Casson Leighton <l...@lkcl.net>: >> >> --- >> crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68 >> >> >> On Mon, Dec 19, 2016 at 9:45 PM, Jonathan Frederickson >> <silverskull...@gmail.com> wrote: >> > Hey, I have a few questions about the laptop housing. >> > >> > - How does one connect it to power? >> >> standard DC jack, anywhere between 7 and 19v. > > > I've never found a standard DC jack ;-). can't remember the P/N, it's in the PDF, http://hands.com/~lkcl/eoma/laptop_15in/pcb1 > I presume a "dognut" type plug? it's not the 5.5mm one, it's too big. > If > so, of what dimensions and which polarity or does it have a polarity > switcher or at least a polarity safety? pin positive. don't know. > I think the USB-C connector is going to be the first "standard" "universal" > charging connector. Standard USB-C cable should be able to provide 60W > (20V*3A) and power cables 100W (20V*5A). But not "ominous" enough yet. too much involved in the way of electronics. >> >> > Can it be powered over USB >> >> powered no, charged, yes. current limit on the OTG port. > > > Well if the input minimum is 7V than neither. 7-19V on DC jack. standard voltage on OTG port (4.somethingsomething to 5.somethingsomething) > But if I understood correctly the EOMA-68 card accepts power over the OTG > port and passes through, any surplus, to the housing. they're hard-wired on the EOMA68-A20. it's not a matter of "surplus", there's no way there's enough current to power the Card *and* the laptop - the currently limit is something like 450mA for standard OTG. > Thus slowing down the > battery drainage of the housing(laptop/tablet). And charging, although slow, > when the housing is turned off. And a little faster when both, housing and > card, are turned off. all correct. > Standard USB only delivers 5V*500mA= 2.5W. But various options are allowed > apparently. https://en.wikipedia.org/wiki/USB#Power not with the AXP209 (the PMIC on the EOMA68-A20) they're not. >> >> >> > or does >> > it require a specific AC adapter? >> >> no. min 4A is best, but if you're prepared to reprogram the >> STM32F072 yourself you could get away with less > > > 4A on the output side I presume so 19v*4A=76W, So a 95W power supply with > 80% efficiency (90*80%=76). Or 85W at 90%. NO. 4A @ 5V, absolute max 20A. look up the bq24193 datasheet. >> >> >> > I have a portable solar array with a >> > battery pack that can charge portable devices over USB, and I'm trying >> > to work out whether or not I'll be able to power the laptop from it. > > > If it has 12v out that would be your best bet I guess. 12v is within acceptable range of 7-19v, yes. l. _______________________________________________ arm-netbook mailing list arm-netbook@lists.phcomp.co.uk http://lists.phcomp.co.uk/mailman/listinfo/arm-netbook Send large attachments to arm-netb...@files.phcomp.co.uk
