> Good idea. > Our SMPS generates 5v @ 1Amp for the USB HOST ports. > Then there's another switcher off that for the 3.3volt power=20 > for the electronics. We'll have over 3/4 amp available for=20 > USB devices or external devices from the 5-volt supply. We're=20 > tight on connector space, but not all pins are used on the=20 > VGA connector. Do any HMDs draw power from the DE-15 connector? No and I would recommend to avoid putting power on the VGA connector. = Great for HMDs, could prove disastrous when you plug a regular monitor into = it. > Another option is to change the power input connector to one=20 > with more pins to support power-out. This may work. What about some post headers on the board and leave it up = to the customer to "remote" the power output with their own connector on = the end - if they need it? > We know at least one HMD maker was looking at a USB dongle=20 > for controlling the display settings, and also for stealing=20 > power from the host. That would work without extra ports, but=20 > not many devices will run from that low a current level. Good idea until you have another product that needs power on the bus as = well or if you have 2 ports and 2 devices hooked up already. Where do you = put the 3rd? -Tony -- Subscription/unsubscription/info requests: send e-mail with subject of "subscribe", "unsubscribe", or "info" toWear-Hard Mailing List Archive (searchable): http://wearables.blu.org Please, *PLEASE* don't subscribe through a forward/expander/false domain
From Wear-Hard Mailing list Archive (WH)
Maintained by R. Paul McCarty
Archive created with babymail