Re: 3V <-> 5V Level shifter ?

From: An Schwob in USA (schwobus_at_aol.com)
Date: 01/29/05 

Date: 29 Jan 2005 13:54:06 -0800

Two better ideas:

1. use an ARM microcontroller e.g. LPC2000 from Philips or Atmels SAM7s
they are all 3V by definition
2. as already mentioned compare output levels to input levels both
ways. If this is for a hobby project, just measure the voltage levels,
if it is for a product you want to vcreate and sell, you better get the
specifications of the output and input levels.

An Schwob

Martial Chateauvieux wrote:
> Hi,
>
> I want to connect a GPS Smart antenna SAM LS from u-blox, to
the
> UART of an atmega128 running under 5V.
>
> Unfortunately the GPS runs in 3V and has 3V compatible IOs.
> I set up a 3V regulator already for the power supply. Can
someone
> explain how to build a level shifter from 3V to 5V with a
transistor ?
> (How do I choose it, how to connect it ?)
>
> any better idea ?
>
> Thanks
> Martial Chateauvieux