Hi,
> Can anyone advise any good tutorial guide on using a level
> shifter on how I can interface TS7800 3.3V TTL serial port
> to a TTL 5V serial port of a sensor in bi-directional data
> exchange? I can't find any comercial standalone product for
> such converter, unlike the common one seen in RS232-TTL and vice-versa.
Just to clarify your requirement, you want
to directly connect a 3.3V UART to a 5V UART
without using RS232 level shifters in between?
------ 3.3V ------------- 5V ------
|UART#1|<---->|Level Shifter|<---->|UART#2|
------ ------------- ------
The level shifter can be a 3.3V powered buffer that
is 5V tolerant, or it can be a bus switch powered
from 4.3V (a diode drop below 5V), and it'll clamp
the 5V levels to around 3.3V.
Fairchild TinyLogic parts are nice. Take a look at the
NC7SZ125P5X buffer, or the NC7SZ384P5X bus switch.
If you are interfacing a wider bus between 3.3V and 5V
logic, there are many 3.3V buffers with 5V tolerant
inputs.
Cheers,
Dave
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