• State Resolved
  • Locked Locked
  • Replies 2 replies
  • Subscribers 33 subscribers
  • Views 520 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

Original question:

ISO1042: RTM

ISO1050: 10V HF coupling

Needhu Gunasegaran
Intellectual 2890 points
Part Number: ISO1050
Other Parts Discussed in Thread: ISO1042

Hi team,

My customer did some tests on ISO1050 and found sensitivity at 10V HF coupling to the CAN differential signal.

In our investigations regarding the susceptibility to interference, the following questions arise:

• Can you explain the isolation principle of the device?
(The ISO1050DUBR is based on a capacitive separation, we know that, but how is the digital information transmitted?)
• Why does the driver have a Common Mode Input Range? Due to the isolation, the common mode input range is equal to the isolation voltage in our understanding, if no bus GND is used to the bus side.

Could you please answer the questions.

Thanks,

Needhu

  • 0
    TI__Expert 6195 points

    Hi Needhu,

    Thanks for asking your questions on E2E!

    The ISO1050 uses an edge based architecture to transmit digital data. Further details on that can be found in the Digital Isolator Design Guide. (See section 1.1 and 1.2 on pages 2 and 3 for edge based vs on-off keying architecture).

    To your second point, common mode is not equal to isolation voltage. Common mode input range is in reference to GND2. Vcc2 still needs a voltage with respect to GND2 in order for the device to function. So the common mode input range specification is needed. 

    We do have a new isolated CAN transceiver that is currently sampling on ti.com; the ISO1042. It uses an on-off keying architecture which improves, among other things, CMTI performance. The ISO1042 also has an extended common mode input range of ±30 V. 

    Please let me know if that answers your questions or if you need me to clarify anything. 

    Thanks!

    Dan

  • 0 in reply to Dan Kisling
    TI__Intellectual 2890 points
    Dan,

    Thank you very much for your response. The customer is sampling ISO1042 already. Thanks. :)

    Needhu