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ISO1541: Please help to review below schematic.

Sophia Yao
Prodigy 701 points
Part Number: ISO1541

Hi,

could you please help to review below schematics? 

Thanks and best regards,

Sophia

  • 0
    TI__Expert 6195 points

    Hi Sophia, 

    Thanks for asking your question on E2E!

    I have some initial thoughts / questions looking over this schematic:

    1. Could you explain the purpose of Q25? 
    2. Could you explain the purpose of Q28? 
    3. Could you explain the purpose of Q23?
    4. I2C_EN_U is connected to GND_B through Q19, but is also connected on the GND_U side of the device. I believe this would violate the isolation barrier. 
    5. What voltages are VCC_U, VCC_B?
    6. Are there pull-up resistors on another part of the schematic for SDA_B, SCL_B?
    7. What is the ISO1541 interfacing with on the "U" / SDA2 side? Typically this is the I2C bus with several devices connected.
    8. What is the ISO1541 interfacing with on the "B" / SDA1 side? Typically this is the MCU side with just a single device. 

    Best regards, 

    Dan

  • 0 in reply to Dan Kisling
    TI__Expert 6195 points

    This discussion is being handled offline in order to share more of the schematic. 

    The major findings will be summarized and posted on this thread afterwards. 

    -Dan

  • 0 in reply to Dan Kisling
    TI__Expert 6195 points

    After reviewing the schematic there were no major findings. 

    The ISO1541 is being used primarily for level translation. 

    For more information on designs like this one please see this TI Reference Design. 

    Best regards, 

    Dan