[gta02-core] Modem schematic / RF help needed

[Dave Ball]

Werner Almesberger wrote:
> Rask Ingemann Lambertsen wrote:
>   
>>    I was thinking of just connecting the switch in parallel with R8101
>> (currently 0R that we would make NC) and connecting the enable input
>> (ON/OFF) to the GSM_2V8 supply.
>>     
>
> Oh, that would be a very elegant solution. Since the level shifter
> is operating only in the CPU -> modem direction, there should be
> no risk of the modem accidently keeping GSM_2V8 up.
>   

I've just implemented this with the NTDG1100L (new part, so the symbol 
could do with a review too), and added the IO2V8 output to LDO3OUT on 
the PMU.

Dave