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ISO1050: ISO1050 startup problem at low temperature

JChristophe VALANCE
Prodigy 25 points
Part Number: ISO1050


Hi,

On my design I notice startup problem with the isolated CAN transceiver ISO1050 in low temperature.

Once the component reach -18°C , there is a delay before the availability of the transceiver after power on.

The delay increase with lower temperature, I measured up to 4s at -30°C.

Since there is a delay at power on, the microcontroleur reports a "bus off" error as he is not able to transmit can message at this temperature level

The both side of the transceiver are powered under 5V.

 

On the following screen shot I measured the timing on the TX and Rx pins of the transceiver with a test software to have square signal (not the real can bus tx signal)

Startup at -18°C (beginning of the problem)

Startup at -30°C

let me know what is wrong

Thanks

  • 0 in reply to JChristophe VALANCE
    TI__Expert 6195 points

    Hi,

    I am sorry to hear you are having some trouble with the ISO1050. A several second delay for CAN communication is certainly a problem.

    I do believe we can debug this, but I will need some additional information.

    Could you provide me the following:

    1. A scope shot with the following signals during startup:
      1. Vcc1 
      2. Vcc2
      3. TXD
      4. RXD
    2. Schematics and layout for the ISO1050 in your application

    I understand that (2) may be something you would not wish to share on a public forum. I have sent you an E2E friend request so we can send private messages to share any sort of information you would not want to share on a public forum. 

    Best regards, 

    Dan

  • 0 in reply to Dan Kisling
    TI__Expert 6195 points
    Hi JChristophe Valance,
    I have reached out to you over the private E2E messenger more about this issue and have not heard from you in about a week. I'm going to close this thread for now. If you need further support, please feel free to open a new thread or reply to the private message on E2E.
    Best regards,
    Dan