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MAX14934BAWE+T

Jyothi_bstpl123
Jyothi_bstpl123 over 2 years ago

Hai,

This is Jyothi from BStechnotronics Pvt Ltd,Hyderabad,

For one of our designs we consider MAX14934BAWE+T part as isolator between USB and MCU IC

But i am not getting any out put from IC,

enclosed is schematic,

Can anyone please help me out with this

Thanks & Regards

Jyothi

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  • michaelkellett
    michaelkellett over 2 years ago +1
    You have connected the USB D+ and D- to a logic level isolator. This is not going to work. Read the USB spec and the isolator spec. Why are you bothering with the isolator since you have common 0V…
  • misaz
    misaz over 2 years ago +1
    You do not need isolator on USB line. You need ESD protection. Use for example MAX13202 instead. Here is example usage from MAX78000FTHR schematics which is publicly avalaible on maxim website:
  • michaelkellett
    0 michaelkellett over 2 years ago

    You have connected the USB D+ and D- to a logic level isolator. This is not going to work.

    Read the USB spec and the isolator spec.

    Why are you bothering with the isolator since you have common 0V connections across it.

    If you want to protect the microcontroller there are better ways to do it.

    MK

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  • misaz
    0 misaz over 2 years ago

    You do not need isolator on USB line. You need ESD protection. Use for example MAX13202 instead. Here is example usage from MAX78000FTHR schematics which is publicly avalaible on maxim website:

    image

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  • Jyothi_bstpl123
    0 Jyothi_bstpl123 over 2 years ago in reply to misaz

    Thank you

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  • Jyothi_bstpl123
    0 Jyothi_bstpl123 over 2 years ago in reply to michaelkellett

    Thank you,

    Can you please suggest any part Dual channel bidirectional Isolator 

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  • michaelkellett
    0 michaelkellett over 2 years ago in reply to Jyothi_bstpl123

    I've never used one but this might do:

    https://www.mouser.co.uk/new/analog-devices/adi-evaladum4165-evaladum4166-eval-boards/

    There will be others, just Google for "usb isolator chip" - lots of useful hits on the first page or two.

    It will be much easier to design if you use a chip intended for isolating  USB.

    MK

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