You'd think. But the cheapest interface ICs only deal with the data lines. You h... | Hacker News

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		jws on Jan 25, 2011 \| parent \| context \| favorite \| on: An USB plug that goes both ways You'd think. But the cheapest interface ICs only deal with the data lines. You have to go to extra effort to control the 5V line. It isn't trivial. You want to flow 100mA without dropping your 5V source much, because the USB device is still expecting it to be 5V.

marshray on Jan 26, 2011 [–]

You'd think. But the cheapest interface ICs only deal with the data lines. You have to go to extra effort to control the 5V line.

That's insane.

Clearly my problem is that I am insufficiently cynical. I'll just have to try harder.

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