andy at openmoko.com
Wed Aug 20 10:39:14 CEST 2008
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Somebody in the thread at some point said:
| On 8/19/08, Joerg Reisenweber <joerg at openmoko.org> wrote:
|> This power removal is done by U1705, and it should relyably cut power
|> disable IO_3V3 what is quite normal for shutoff.
|> No special kernel action required.
| This is in a lot of cases a faulty assumtion.
When IO_3V3 goes down it goes down... the pcf50633 has special
arrangement to bring down "off" regulators to 0V.
IMO it doesn't make any harm to see MOSFET switches on the power rails
to whole GSM side so there is no question. This was done on a previous
prototype I saw in .tw, but the low Rdson switch they used had built-in
currently limit (1.6A IIRC?) that got triggered at low temperature and
highest TX setting destroying TX action. So they removed it from PA
side... maybe we can bring this back in the future.
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