[gta02-core] Modem schematic / RF help needed
alvieboy at alvie.com
Wed Sep 16 11:07:39 CEST 2009
Rask Ingemann Lambertsen wrote:
> How is the NTDG1100L difficult to source? It's in stock at Digi-Key
> and available in quantities down to one as cut tape or Digi-Reel. How much
> easier to source do you want it? There's even a pin compatible substitute
> with roughly the same specifications.
I should have said "not in stock" only. I am assuming we (openmoko) have SI1040X in stock, but see my other mail.
>> And I'd really prefer enabling that using a longer delay line (ie, CPU output). That would have other benefits too, like lower consumption at power up.
> So you want to turn on the 2.8 V I/O supply separately? Please elaborate
> on how much current you are talking about here, because I don't see how it
> would be significant given that we are already charging a 100 uF capacitor.
I meant switching on the modem using a GPIO instead of using the 2.8V supply. But I completely forgot we switch that on in software, so obviously it is a non-issue.
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