Am Mi 12. März 2008 schrieb Brad Midgley: > joerg, > > > Ah, i see a Y-adapter: one end usb-device, one end receptable for usb charger, > > one end GTA02 *with ID-R of e.g 82k* PLUS *2 x 15k pulldown*. > > And GTA02 automatically switching to external powered host mode. :-) > > This was on the list of accessories from the beginning, wasn't it? ;-) > > > > humm, on 2nd thought, nothing bad will happen when this mode will check for > > 47k instead of 82k. > > I want to make sure (as long as it's not premature) that we capture this in > > http://wiki.openmoko.org/wiki/Neo_FreeRunner_GTA02_Hardware > > I can follow the need for pulldowns on d+/d- but where did 82k come > from? How does your comment about 47k fit in?
82k was just a fantasy-value i introduced to identify the jr(C)-Y-adapter. There's a 47k (from usb-id to GND) specified for identifying the OM-fastcharge-usb-adapter, to enable >500mA USB supply handling for turbo-charge (see my post here in this list some days ago, as well as wiki/charger something) However there's no need at all to identify the Y-adapter by it's own 82k value, it's just fine to switch to host&ext-power mode whenever NEO sees the 47k in ID-pin, which is specified for GTA02 aka Freerunner usb-charger. If there is 47k, it's either the plain charger (= no device and no real usb at all, ext-power hostmode won't hurt), or we have charger PLUS Y-adapter, which is fine for external powered hostmode, which means you can connect devices to NEO-host and still supply power to these devices (about 1,5A for Freerunner's 2,5A charger) AND the NEO (about 1A for Freerunner's 2,5A charger) via charger. In the end this means: the 47k ID-R should be in the Y-adapter, and you may use arbitrary usb-chargers (>1A) with it for quick-charge. However the OM-charger will most probably have an own 47k, so you can use it without the Y-adapter. Whenever Y-adapter or OM-charger is connected, Freerunner enters externally powered USB-host mode and starts quick charge. On device end of Y-adapter you may use an unpowered USB-hub, which is powered via charger and usb. Once i see a wiki page, i might eventually provide a (however trivial) circuit diagram, as soon as i reanimate my eagle layout suite underneath the dust if 7 years ;-) Premature? It's clean, just missing the (kernel)patch to handle 47k detection and switching to ext-powered host mode automatically. Andy said he will provide the patch. I'm quite sure these hw-details won't change for GTA02 Mass Production. I'll start tomorrow to sell these jr-Y-adaptors for 19,95€ + shipping ;-) cheers jOERG _______________________________________________ OpenMoko community mailing list [email protected] http://lists.openmoko.org/mailman/listinfo/community
