CL1B power distribution
acahalan at gmail.com
Sat Apr 25 01:06:12 EDT 2009
John Watlington writes:
> - The SD slot and USB ports may be powered in suspend
> This is "just in case" some SD cards or USB devices don't handle
> being suspended
> aggressively. We will support laptop wakeup on interrupt from any
> of these ports (SD or USB). Under software control they may
> also be powered
> down during suspend.
There is value in making this per-port for the USB.
> - The audio codec remains partially powered in suspend
> This is in order to support "wakeup on jack insertion". The codec
> may be placed in a very low power state during suspend.
I would have expected power to be optional. The software doesn't
always need to use this component during the run state.
> Additional changes from Gen 1 include the ability to both measure
> DC input current and VIN voltage, as well as EC control over the
> current drawn from the DC input. The intent was to better support
> charging directly from solar panels.
I hope that this will be available to activities like Measure.
Ideally updates could be frequent enough to pick up a waveform
from an unrectified power supply. (spare audio channel?)
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