Re: [Paparazzi-devel] CMOS interfacing to TTL

[Widyawardana Adiprawita]

Dear Matthew Currie,

Actually I'm also having problems with XTend modem. I
have the old version (ordinary pcb version) and I
connect it directly to dsPIC UART (I'm implementing
paparazzi like autopilot in dsPIC) and having no
problem. But when I buy the recent australian version
(gold pcb version), it can not work when I connect it
directly to dsPIC.

Does this mean the old one is having 5v IO and the new
one is 3.3v IO ?

Thank's

-doni-

--- Matthew Currie <address@hidden> wrote:

> Deane,
> 
> 
>   Double check the IO voltage levels in the
> datasheet for the Maxstream 
> modem.  The I/O is 3.3V (but 5V tolerant, meaning TX
> will drive 3.3V 
> out, and accept 0-5V in) on the philips LPC2148
> (Tiny13 1.1 cpu).  If 
> your I/O from the Maxstream is 5V TTL then you are
> safe to interface 
> directly to the Tiny13.
> 
> 
> Regards,
> Matthew Currie
> 
> Deane Chadwick wrote:
> > Hey guys,
> >          I was wondering whether we can connect
> the Maxsteam Xtend 
> > straight to the Tiny 1.1 autopilot, or is there
> interfacing issues 
> > with the CMOS and TTL.
> > Thanks Deane
> >
>
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