MrGlasspoole
Well-known member
Searching on this topic in the web does not bring up answers.
The answer is always you can have a cable length of this and that with RS-232, RS-422 or RS-485...
But what about communication on the same PCB?
I2C and SPI first where meant for chip to chip communication on the same PCB - what about serial/UART?
Where is the difference having 10cm (4") PCB traces between the transceiver and the processor or 10cm (4") directly between both processors/chips?
Then there is the question of level shifting.
Most of the transceivers in DIL package have 5v VCC.
If i have two 3.3v processors talking to each other through a transceiver that is powered by 5v - do i need a level shifter?
The answer is always you can have a cable length of this and that with RS-232, RS-422 or RS-485...
But what about communication on the same PCB?
I2C and SPI first where meant for chip to chip communication on the same PCB - what about serial/UART?
Where is the difference having 10cm (4") PCB traces between the transceiver and the processor or 10cm (4") directly between both processors/chips?
Then there is the question of level shifting.
Most of the transceivers in DIL package have 5v VCC.
If i have two 3.3v processors talking to each other through a transceiver that is powered by 5v - do i need a level shifter?