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LSF0204-Q1: Application Question

Lanxi Li
Expert 5555 points
Part Number: LSF0204-Q1

Hello team,

My customer has one question double confirmed with you.

1. Up translation mode

At present, we do not add pull-up resistors on the low-voltage and high-voltage sides in this application. If it is an IO application, do both ends need to add pull-up resistors?

2. Bidirection translation mode

we do not add pull-up resistors on the low-voltage and high-voltage sides in this application. If it is an IO application, do both ends need to add pull-up resistors?

Best regards,

Lanxi

  • 0
    Guru 246930 points

    Pull-up resistors are needed in many cases, and recommended in most cases. See the FAQ in section 5 of the LSF application note.

  • 0
    TI__Genius 17580 points

    Hey Lanxi,

    What is the use case for the first IO application? It seems to be fixed direction (only up translating from SOC to MCU). If this is the case, we recommend fixed direction/ direction controlled level shifters instead. See this FAQ for a list of devices to be used depending on the interface. 

     

    For the second use case could you also confirm the use case? It appears to be I2C but need to confirm. If it is in fact I2C, then pull up resistors would be needed on both side of the I/O.

    Regards,

    Jack