CL1B power distribution
wad at laptop.org
Sat Apr 25 00:12:28 EDT 2009
This is the current power distribution diagram for A-phase CL1B,
what we can power, when, and how.
There are several power decisions that I believe need explaining up
- 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
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.
- Power efficiency was goal number #1, therefore there are some
multiple sources: one for low power (suspend) and another for high
Additional changes from Gen 1 include the ability to both measure DC
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.
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