Quote:
Originally Posted by rcentros
-- but the switch doesn't always have to be monitored, as it's also a mechanical switch. Computers and cell phones are the same.
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ATX based computers do have 5V low power line which is always on. Even when it is shutdown. The purpose of that line is to allow some intelligent for the motherboard so it can monitor the power button. It can be also used for maintaining the bios. Some ATX powers might have separate switch with I and O positions which really turn them off. But those push and release type buttons can never do same.
But of course the monitoring chip (which might not be the cpu) could be in deeper sleep mode, and wake only from time to time to check the button status. That is why you sometimes have to press little bit longer before the phone turns on after complete shutdown.
Anyway, is it zero consumption? Sorry to dissapoint you, but no it is not.