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TXB0104 problem

Alvaro Querido
Prodigy 60 points
Other Parts Discussed in Thread: TXB0104

I'm using TXB0104 in order to interconnect a freescale IMX25 micronctroller to an external devices through a multi wire cabble.

1.8V UART and 2 I/O pins are connected in IMX25 side (TXB0104 A side).

Enfora GPRS unit 3.3V UART and Input pin are connected in the other side(B side TXB0104A side). through a connector and cable.

If I interconnect both elements there is an unstable signals and communications becomes imposible.

If I disconnect GPRS  and test outputs with an oscilloscope the wave is different if I use an 1X prove or an 10X probe. If I use a 10X probe signal is good and however if I use an 1X prove signal becomes unestable,

Is TXB0104 not usefull for these application?

 

  • 0
    TI__Genius 9085 points

    TXB work best under high impedence and low capacitance loads.

    When you switch from 10X to 1X you're reducing the probe impedance. The TXB may be struggling to drive this lower load impedance.

    TXB translators are not recommended for loads over 70pF. How long is your cable?

     

    Do you need a bidirectional translator or a single direction? The TXS0104 is another bidirectional translator that may be more stable. However, it is not meant to drive heavy loads, which may be present in your system.

     

    Below is a guide to using the TXB type translators.

    http://focus.ti.com/lit/an/scea043/scea043.pdf

  • 0 in reply to Hattie
    Prodigy 60 points

    I had changed to TXS0104EDR and it works perfect in that environment.

    Many thanks for your help.

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