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TCAN1042G-Q1: Simulation Issues with 2x TCAN1042

Kevin Schmidgall
Expert 4120 points

Part Number: TCAN1042G-Q1
Other Parts Discussed in Thread: TINA-TI

Hello!

I have been trying to do some simulations with TCAN1042 and the first thing i wanted to get a normal setup working. 

I took the TCAN1042 TINA-TI Transient sim from the product folder and replicated it to create a peer to peer node. Something i noticed is that the simulation doesnt work properly unless U2 has TXD pulled up to 5V but i thought that TXD was internally pulled up. Is this just an issue with the model?

  1. TXD left floating - you can see TXD U2 is pulled down for some reason and RX is stuck even thought TXD U1 is toggling the line
    1.  
  2. TXD pulled up externally - things look normal, RXD follows TXD
    1.  

sllm402.TSC

  • 0
    TI__Guru 53535 points

    Hi Kevin,

    Your understanding here is correct. The TXD and RXD pins for this device have internal pull-ups, so they should be at Vcc potential when left floating. I'm not sure why the model makes TXD go low while floating. I will see if I can address this with our modeling team. For your future sims, it may be useful to include an external pull-up resistor on the "floating" inputs in order to provide the proper bias externally. This is also fairly common in real applications, so it should be fitting for a sim like this. 

    Let me know if you find anything else with the model we may want to look in to. 

    Regards,
    Eric Schott