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TXB0108: Check if there is any problem with the TXB0108 circuit.

Part Number: TXB0108

I am trying to implement E-ink display interface using TXB0108. I use 7 bits. It contains SPI signals. Please check if this circuit is faulty.

If there is a problem, please recommend a suitable part.

  • Hey SunBae,

    I don't see any issues with the implementation from a schematic perspective. Though, this device is recommended to be used with light capacitive loads (<70 pF) and in my experience this is sometimes hard to meet if there is a connector involved. Apart from the SPI signals, are the rest of the signals unidirectional? If so, can you provide the directionality of them? This will help in selecting a potentially more suitable part.

  • Thank you for answer.
    I put a picture below showing the signal direction.

    Reference:
    In the beginning, when MCU voltage and E-ink voltage were both 3.3V, it worked normally. All signals were fine and the E-ink display worked just fine.
    However, I changed the MCU voltage to 1.8V and connected E-ink using TXB0108. Then E-ink doesn't work at all.

    I used a logic analyzer to measure P25 to P30, but the results are messed up. SCLK has no output, not all signals are normal matching
    So I want to verify this circuit and change it to a new part if there are any problems.

    Maybe I connected the wrong pin number of TXB0180?
    If you look at the picture of Saleae Logic below, BUSY is like SCLK. Maybe I connected the wrong pin number?

    I suffered serious damage from TXB0180 not working properly.

  • I'm confused by the A1 pin markings.
    Is it correct that the red arrow is pointing to the A1 pin?

  • The letters and numbers at the left and the bottom identify the rows and columns. The pins/balls are identified by their name, and that name has nothing to do with the rows or columns. (There would be no column 8 for pin A8.)

    The red arrow points to the ball in row A and column 1. The name of that pin is B2.

  • Please reply to this post.
    thank you.

  • The output of a logic analyzer is not helpful if there are problems caused by cable capacitance. Please show an oscilloscope trace, if possible.

    In general, problems with the TXB can be solved by using unidirectional or direction-controlled level shifters. Is that EPD_MOSI signal really bidirectional?