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Re: [Paparazzi-devel] CMOS interfacing to TTL


From: Matthew Currie
Subject: Re: [Paparazzi-devel] CMOS interfacing to TTL
Date: Wed, 01 Aug 2007 21:05:59 -0700
User-agent: Thunderbird 2.0.0.5 (Windows/20070716)

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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