Quote:
Originally Posted by ProDigit
A mini USB connector generally has 4 lines,2 of which are powerlines (+5V, 0V), the 2 other are datachannels.
Generally a usb device taps power off the 2 channels, and even in chargemode normally doesn't interact with the charger. The arranging of charging (Smartcharger) is inside the reader itself.
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How's the phrase go - "In theory, there is no difference between theory and practice; In practice, there is"...
In practice, when you plug in a 'wall-wart' to the Sony via the usb socket, it
won't (normally?) charge - They may show "USB connected" on the display, but the red LED, indicating power, won't stay lit. This
may be in line with a strict reading of the USB spec, which does have something about devices being expected to negotiage at least the current to be supplied, but it's been a while since I looked at it & I don't recall the details enough to be sure either way. Generic PSP chargers using the barrel connector just work.
"Normally" as there
might be some chargers that work, but if so, I'd expect that they have some form of 'smarts' in order to perform some form of communication with the device.