RE: Expected voltage of serial signals ?

Dennis Ideue wrote:

> 3.3v and ground (low-level TTL), although the devices can talk to,
> and receive 5v TTL logic signals.

Thanks for the prompt answer. I'll pass it on to a hardware developer wishing to
exchange data with my app.

But out of curiosity, how can my GPS, powered by 2 AA batteries, maintain 3.3V?
Unless they raise the voltage, which I doubt, it's probably more like 2.8 - 3V.

Regards,


Luc le Blanc

You can use a Charge Pump or a Line Leveler (such as MAX3232) or something 
similar.  Some Palm implementations (such as the Meazura) run higher that 
3.3V.  (And I think the Janam runs close to 5v)

-- 

"Luc Le Blanc" <lleblanc@cam.org> wrote in message 
news:145261@comm-dev-forum...
> Dennis Ideue wrote:
>
>> 3.3v and ground (low-level TTL), although the devices can talk to,
>> and receive 5v TTL logic signals.
>
> Thanks for the prompt answer. I'll pass it on to a hardware developer 
> wishing to exchange data with my app.
>
> But out of curiosity, how can my GPS, powered by 2 AA batteries, maintain 
> 3.3V? Unless they raise the voltage, which I doubt, it's probably more 
> like 2.8 - 3V.
>
> Regards,
>
>
> Luc le Blanc
>