teohoeeng wrote:
> I use 74LVC245AN (a level shifter), suppose similar as 74LVC3245. However,
> today I make all the connection between my 5V TTL sensor to 3.3V TTL TS7800
> serial port using this level shifter, I got the same garbage data problem.
> Seems strange that this problem doesn't go away...seem that I am trying to
> solve multiple problems or one unknown problem.
>
> Don't anyone has manage to get a 5V TTL sensor to work with 3.3V TTL serial
> port on TS7800. I tested my 3.3V TTL GPS sensor working with the TS7800 5V
> TTL serial port though with the same C code. So I rule out any software
> problem.
>
> Anyone know if there is a need to place an inverter before the level shifter
> to invert the signal between 3.3V TTL and 5V TTL, like the inversion done in
> RS232 standards from TTL?
Why not use some transistors? There's gotta be about 50 ways to do it
:) Basically, setup one transistor to invert, and the second is for
level shift.
Jason
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