--- crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68
On Wed, Aug 31, 2016 at 12:28 AM, Joseph Honold <[email protected]> wrote: > > On 08/30/2016 05:11 PM, Luke Kenneth Casson Leighton wrote: > >>> Seems like there should be a minimum power requirement that all cpu cards >>> and devices must meet. >> >> okay - so you used the word "devices" which is not part of EOMA68 >> terminology. sorry i missed this, so didn't understand the question. > > I spose motherboard is the correct term i should have used. "Housing" is now the official term. motherboard usually means "CPU is on.... the motherboard". >> *from the perspective of the EOMA68 Cards* the *MAXIMUM* that they >> are permitted to use is 1.0A @ 5.0v >> >> therefore... >> >> *from the perspective of EOMA68 ***HOUSINGS*** .... * the *MINIMUM* >> that they must provide is: 1.0A @ 5.0v > > Maybe I'm misreading the spec, but I don't see it specify that my motherboard > must be able provide 5V 1A to the cpu card. That's the reason for asking this > question. i know... and it's a good question, which is why i've started a section on the discussion page. >> above exactly 1.0A @ 5.0v, housings are ***REQUIRED*** to cut power >> without warning. > > I don't see this in the spec either. Am I correct that > http://elinux.org/Embedded_Open_Modular_Architecture/EOMA-68 is the > 'official' specification for eoma-68? yes. so it needs to be on that. >>> This seems like a broken spec to me. Nothing in electronics is exact, so a >>> sane spec should have a reasonable margin between the maximum current a card >>> is allowed to draw and the point at which overcurrent protection is required >>> to kick in. > >> appreciated - very good point this is the first time it's really >> been discussed. i'm already uncomfortable with the idea of having 5.0 >> watts in an enclosed space. 3.5 is okay. i _was_ thinking of raising >> the Housing limit to 5.5 watts, but was slightly concerned that people >> would abuse the extra headroom. >> >> suggestions appreciated.... hmm... let me just add a section on the >> specification / discussion on the elinux.org talk page to reference >> this discussion... > > Adding a section for power specifics would help clarify things. yeahyeah. l. _______________________________________________ arm-netbook mailing list [email protected] http://lists.phcomp.co.uk/mailman/listinfo/arm-netbook Send large attachments to [email protected]
