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TXB0104-Q1: TXB0104QPWRQ1 unstable behavior

Luciano Vittori
Prodigy 110 points

Part Number: TXB0104-Q1

Hi TI Experts,

I am currently migrating a motor controller board to a 3.3V system using the F28P659DK microcontroller. To interface my original 5V encoder circuit with the MCU, I implemented a voltage translator; however, I’ve found that the chip outputs are unstable.

I would like to share my current schematic and oscilloscope waveforms to see if this behavior is expected and if there are any recommended workarounds.

Encoder circuit

encoder circuit.png

Voltage translator input waveform

Voltage translator input.bmp

 

Voltage translator output waveform

Voltage translator output.bmp

Voltage translator output2.bmp

Thank you in advance,
Luciano.

  • 0
    TI__Guru 57251 points

    Hi Luciano,

    Please help to check if there are any long cabling/ heavy capacitive loads at  the outputs of the device. The oscillations are generally caused by unintentional triggering of the internal one-shots, due false triggering. Here is an app note that covers additional details: www.ti.com/.../scea135.pdf

    Regards,

    Jack