Hi, why there is a requirement for VCHGR_UNDSHT < 4V? If the voltage of charger fall below 4V when the charger is connected for 2 ms is this a big issue?
Regards, Silvestro Joerg Reisenweber wrote: > > FYI: > > From http://www.usb.org/developers/devclass_docs/batt_charging_1_0.zip > > ----- > Battery Charging > Specification > Revision 1.0 > Mar 8, 2007 > > p.19: > If the current drawn from a USB charger changes suddenly within the range > of > 0mA to 500mA, then the > transient voltage from a USB charger shall not go below VCHGR_UNDSHT. > Under no > circumstances shall the > transient voltage of a USB charger exceed VCHGR_OVRSHT. > > p.23: > Charger Overshoot Voltage VCHGR_OVRSHT 6.0 V max. > ----- > > Though we couldn't even attach a USB-charger compliant to this spec, as it > has > to be equipped with micro-USB plug, we should expect to see voltages on > USB-receptacle of up to 6.0V AT LEAST. > > I think it's a strong argument for additional OVP extending our actual > abs.max.rating of 5.5V to limits safely beyond 6.0V, like we are actually > about to do for GTA03. > > cheers > jOERG > > > _______________________________________________ > hardware mailing list > [email protected] > http://lists.openmoko.org/mailman/listinfo/hardware > > -- View this message in context: http://n2.nabble.com/USB-OVP-tp790003p1394138.html Sent from the Openmoko Hardware mailing list archive at Nabble.com. _______________________________________________ hardware mailing list [email protected] http://lists.openmoko.org/mailman/listinfo/hardware
