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Amrith
Associate
Mar 24, 2023 8:46 AM UTC
Question

str485 doesnt output differential signal , kndly provide any feedback to improve the design

str485 differential output is not as expected , we have followed datasheet to design pcb yet only one signal (non inverted) is showing up as expected in logic anlyser (see attachment)

attaching pcb design for your reference.

Should the outputs A and B have 2 resistors 63ohms each with a centertap capacitor connecting to gnd as used in some evaluation board?

Kindly provide a solution

Thank you

update:

added 20k pullup on A and 20k pulldown on B output line as per failsafe configuration .

0693W00000aJh3KQAS.png0693W00000aJdaPQAS.png

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    3 replies

    Amrith
    AmrithAuthor
    Associate
    Mar 30, 2023 5:23 PM UTC

    Reminder : Kindly provide any suggestion to make str485 work.

    If you have any pcbschematic or designs that worked kindly provide those .

    Tesla DeLorean
    Guru
    Mar 30, 2023 6:46 PM UTC

    Would suggest you work with your local sales office and FAE (support engineer) assigned to your account.

    Tips, Buy me a coffee, or three.. PayPal Venmo (See Profile) Up vote any posts that you find helpful, it shows what's working..
    Amrith
    AmrithAuthor
    Associate
    Mar 31, 2023 1:45 PM UTC

    How can I find the contact for the same?