• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 18 subscribers
  • Views 610 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TXS0206A: how to use TXS0206A

Michi Yama
Guru 10030 points
Part Number: TXS0206A
Other Parts Discussed in Thread: AM3354

Hi,

My customer is considering to use TXS0206A device. But its use case is not level shifter.

 In my customer's system, the distance from the host processor(AM3354) to SD card is long. It exceeds the limitation of the wiring restriction of SD standard.

My questions are below.

1) So customer would like to extend the distance by inserting TXS0206A between the host processor and SD card. Regarding the power supply, customer use 3.3 V for both VCCA and VCCB. Maximum clock is 55MHz. So SD card bus speed is until high speed.  Is there any problem with this use case?

2) According to datasheet of TXS0206A,  it is written in the below.

    The SDIO lines comprise a semi-buffered auto-direction-sensing based translator architecture that does not require a direction-control signal to control the direction of data flow of the A to B ports (or from B to A ports).

 Is this mean that host processor does not need to control the signal direction?

Please advise me.

I appreciate your quick reply.

Best regards,

Michi

  • 0
    TI__Intellectual 2100 points
    Hi Michi,

    Theoretically this chip can do the buffering your customer has in mind, it is really more of a question of reading the SD spec and determining why that length distance is there. Are you exceeding just the base unbuffered characteristics for standard device drivers, a situation where buffering would be OK. Or is the length rule there because of some logic reason? i.e. Ethernet operating in half duplex requires maximum cable lengths because it can't handle the skew in signals from the physical distance they are traveling since the time shift and operational speeds are similar and can introduced error. I am not familiar with the standards enough to determine which case you are operating in. More than likely, buffering as you would like to is perfectly alright I'd bet. Also, don't forget, that if you want you can probably just use a buffer for this application too.

    In response to your second question, yes this is an auto sensing bidirectional chip. You don't need to control the direction, it will do it on its own, huzzah for technology!

    If this answered your question please verify the solution below using the green button! If not and you have additional questions, just let me know.

    Best Regards,
    Nick