On 12/07/2011 03:21 PM, Ronan Paixão wrote:
For example, the Idle current on the $4.40 Atmega32u2, an AVR microcontroller which has USB support, is ~250uA@1MHz, with as little as 4.6uA on Power-down. Probably add a little for the USB peripheral.The power drain is going to be the cost of bus signalling. There's a short discussion at http://www.beyondlogic.org/usbnutshell/usb2.shtml
Except that then we have to implement new software to drive devices on I²C that are already really well-handled on USB.For simplicity's sake and easy hardware implementation and availability, I'd go for I²C support.
Atmega48PA, with 7uA@128KHz/2V on Idle, including the Internal RC Oscillator.For I²C on the 10-foot cable they use for dance-pads, there is a power cost for driving the bus. It's not going to be really high impedance, low-power-drain, without having noise problems.
Thanks
Bruce
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