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Re: [Paparazzi-devel] CMOS interfacing to TTL

From: Deane Chadwick
Subject: Re: [Paparazzi-devel] CMOS interfacing to TTL
Date: Thu, 2 Aug 2007 14:50:44 +1000

     Thanks for the reply, the I/O from the Maxstream is 5V but it is CMOS and not TTL, does that mean we will need a chip that converts the CMOS to TTL before we connect it to the Tiny or will the 5V CMOS be complatible.
Thanks Deane

On 8/2/07, Matthew Currie <address@hidden> wrote:

  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.

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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