[gta02-core] Telit 2.8 V logic

[Álvaro Lopes]

Werner Almesberger wrote:

> So that would work. The 3.21 uA would come from TX, RTS, and maybe
> DTR. We should have to drive these lines high only when the modem
> is not powered off, so we'd have a total of about 10 uA leakage vs.
> a consumption of 2.4 mA of the idling modem.
> 
> Opinions ?

Personally I prefer using some small level shifters. Like MAX13001E [1] 4x4UCSP (2mm x 2mm), 6 bit wide.

I don't like adding resistor dividers, they will make design more susceptible to EMI interference.

[1] http://www.maxim-ic.com/quick_view2.cfm/qv_pk/4759

> 
> - Werner
> 
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