Hi everyone!

I'm trying to make a LIN transeiver in order to perform a more huge system, this is a data generation sub-system.
Let's illustrate that:


Well, I'm having a lot of trouble with the "SW1" and "SW2", the power supplies are able to go from positive to negative voltages (to -10 to +40) in controlled steps, but I really don'y know how to make that switches, i'm totally lost, someone has an idea to do that?

maybe some useful data:
max transmission speed: 20KHz
Max Recessive voltage: 42V (actually, for the moment is just 20V)
Min Recessive voltage: -6V
Max Dominant voltage: 42V (same)
Min Dominant voltage: -6V

Normal LIN transmissions levels are dominant voltage = 0 and recessive 12V.

As you can see, the major problem are switching with a negative voltages, for example if Vdom=-5.4V and Vrec=0V

Thanks in advance!

EDIT: I've been searching, maybe something like a triac will work? (http://www.farnell.com/datasheets/1786033.pdf)
EDIT2: more components that may work for this application: "Random Turn-On Solid-State Relays" like this one: http://www.farnell.com/datasheets/1682136.pdf. I think one of these should work, sorry, I never had to use this type of components...

 

This might help -

http://www.ti.com/lit/an/slva948/slva948.pdf

Here are possible approaches -

https://electronics.stackexchange.c...nic-switch-with-negative-and-positive-voltage

https://www.electro-tech-online.com/attachments/driver-png.4851/


Regards, Dana.