On Mon, 14 Sep 2009 13:21:59 -0700, Darryl Ramm wrote:

That is *not* the only problem. This is a case where the devil is in the
details. Various (usually pull-up resistors) signaling schemes or funky
wiring are used by different manufactures to indicate charger
functionality or request higher current etc. As has been discussed here
the iPAQ 310 has some compatibility issues, there can be similar issues
with the iPhone, and so on.

I understand what you're getting at, but there's about zero chance that a
cigar lighter adapter would take any notice of pull-ups etc. - what would
you expect from a $US 5.00 charger? Or the USB socket on a cheap computer
for that matter.

I had a quick scout for specifications: the only ratings I could see were
one at 5v/700mA for one unit and 5v/1000mA for a second, so I guess they
nominally conform to the USB 2.0 current rating. I'd suggest that a
device manufacturer who demanded more was being arrogant. Oh, wait, you
did say HP and Apple...


Martin

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