Re: [Freetel-codec2] How to build microphones with device control buttons

[Bruce Perens]

There's no real reason that USB peripherals have to be power hogs. It's just that most aren't designed to conserve power. They use the same microprocessors that are used in power-saving applications. You can put the microprocessor in deep sleep when the PTT and control buttons aren't depressed, turn off the backlight or put it on a timer, etc.

    Thanks

    Bruce

A USB 3.0 master, on the other hand, is required to support 1 unit load at 5 V, 150 mA. You don't have to /use /all of that power, though. Peripherals can /request /more current, up to 0.9 A, but they start out in 1-unit mode. It would be interesting to see how little power we can use and still operate the USB.

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