CL1B power distribution

Tiago Marques tiagomnm at
Mon Apr 27 15:17:13 EDT 2009

On Sat, Apr 25, 2009 at 5:12 AM, John Watlington <wad at> wrote:

> This is the current power distribution diagram for A-phase CL1B,
> identifying
> what we can power, when, and how.
> There are several power decisions that I believe need explaining up front:
> - 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.
> - 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.

Sorry to ask, but is "wakeup on jack insertion" relevant for someting?
Also, on Gen1 I can still hear noise coming from the speakers when they're
muted, some current seems to still go through there. Has anyone ever found
out how much?
Best regards,
                                  Tiago Marques

> - Power efficiency was goal number #1, therefore there are some voltages
> with
>  multiple sources: one for low power (suspend) and another for high power
> (run).
> 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'm sure there are mistakes --- let me know what you think.
> Cheers,
> wad
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