Can a measurement on the K22 be done with the Vbus at 3.3V as is required by MFi? There are actually two power modes required:
Has Freescale measured the K22 for MFi applications? Can it meet the above requirements? Ideally do you have a demo app I can run on the FRDM-K22F to measure the two scenarios above to determine if the K22 is compliant for power consumption?
Some additional information and request:
Accessory Interface Spec from Apple for MFi - section 28.2.1 - states that the device transitioning from the streaming interface to the zero bandwidth interface should be used as the trigger for the accessory to transition form high to low power modes. There doesn't seem to be any mention of any USB suspend, wait or stop modes as an option to trigger power mode transition. Is there any demo code to help with this?