bluetooth powerup

Joerg Reisenweber joerg at
Wed Aug 20 04:26:57 CEST 2008

Am Mi  20. August 2008 schrieb Sean McNeil:
> The software stack I am working with assumes:
> 1) That the powerup of bluetooth is "1" and powerdown is "0".
> 2) That reading back the value corresponds to the value, not opposite.
> 3) No reset required.
> The following patch does this. Plus I was wondering if there is
> something else on LDO4. Can that regulator be reduced when not powering
> bt? Is there any power savings doing so? I've knocked it down to 0 when
> turning off and haven't seen any problems so far.
> Sean

A short glance at schematics at 
shows there is no other circuitry powered by LDO4.
I wonder what else powerup and powerdown for BT might do, if not switch LDO4.
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