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LSF0108-Q1: About LSF0108-Q1

user6448843
Prodigy 90 points
Part Number: LSF0108-Q1
Other Parts Discussed in Thread: TXU0104-Q1, , TXU0204-Q1, TXU0304-Q1

Tool/software:

■Question

　① Does this model support I2S interface?
　　 ※I would like to confirm this as it is not mentioned in the datasheet.

　② Can this model use the I2S and I2C interfaces simultaneously?

  • 0
    Guru 263840 points

    1. LSF devices are optimized for bidirectional open-drain signals, but they can also be used for unidirectional push/pull signals as used in I²S if you size the pull-up resistors correctly for the desired speed. In general, TXU translators (e.g., TXU0104-Q1) would be a better choice; the LSF would be used only if lower cost is more important than power usage and robustness.

    2. Yes; all channels are independent.

  • 0
    TI__Mastermind 21331 points

    Hi,

    In addition to Clemens' answer, you may also see Voltage Translation Application Quick Reference for list of recommended devices per interface. 

    Please let us know if you have any further questions. 

    Thanks,

    Jack 

  • 0 in reply to Clemens Ladisch
    Prodigy 90 points

    Thank you for your answer.

    ＞1. LSF devices are optimized for bidirectional open-drain signals,
    ＞but they can also be used for unidirectional push/pull signals as used in I²S if you size the pull-up resistors correctly for the desired speed.
    ＞In general, TXU translators (e.g., TXU0104-Q1) would be a better choice; the LSF would be used only if lower cost is more important than power usage and robustness.

    ◆Additional questions

    ・Regarding the I2S interface, DIN is input and DOUT is output, so it is a bidirectional signal.

    　Just to be sure, is it possible to connect using LSF0108-Q1 (1pcs)?

    ・TXU0104-Q1 is a unidirectional device.

    　Therefore, I don't think it is possible to connect TXU0104-Q1 (1pcs) to an I2S interface. Is that possible?

  • 0 in reply to user6448843
    Guru 263840 points

    DIN and DOUT are two separate signals. Both are unidirectional.

    The LSF can be used for them

    The TXU0204-Q1/TXU0304-Q1 have channels going in different directions.

  • 0 in reply to user6448843
    TI__Mastermind 21331 points

    Hello,

    If both I2S and I2C signals are in need of level shifting, the LSF0108-Q1 would be be compatible and can be used for both, whereas the TXU-Type devices will not be able to support I2C. You may see Voltage-Level Translation With the LSF Family detailing setup/ functionality of the device. 

    Regards,

    Jack 

  • 0 in reply to Clemens Ladisch
    Prodigy 90 points

    >1. LSF devices are optimized for bidirectional open-drain signals, but they can also be used for unidirectional push/pull signals as used in I²S if

    >you size the pull-up resistors correctly for the desired speed. In general, TXU translators (e.g., TXU0104-Q1) would be a better choice; the LSF

    >would be used only if lower cost is more important than power usage and robustness.

    ◆Additional questions (about connecting the I2S interface)

    ・Can you tell me specifically why the TXU series is generally?

    　Also, can you tell me why the LSF0108-Q is not generally?

  • +1 in reply to user6448843
    Guru 263840 points

    LSF requires pull-up resistors at its outputs. So it does not work with pull-down resistors, and you have to size the pull-ups correctly to find a balance between speed and power usage.

    TXU has none of these problems, and it buffers the signals, which isolates the two sides, improves signal quality, and allows longer traces.