• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 33 subscribers
  • Views 262 views
  • Users 0 members are here
Support feedback
Options
Options
Related

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.

TCA9617A: Whether TCA967A supports parallel mode

Antony Fu
Expert 3345 points
Part Number: TCA9617A

Hello Team,

There is one system that need two hosts and one slave, so whether we can tie the B sides of 2pcs of TCA9617A together to support parallel mode?

pls refer to the schematic of this design, thanks in advance.

Antony3386.11.pdf

  • 0
    TI__Guru 62920 points

    Hi Antony,

    No, the B sides of these devices cannot be connected to one another.  The VOL of the B side is set to be higher than its VIL so that the buffer does not lock up whenever it propagates a low bit.  For more information on this technique (often referred to as a static voltage offset), you might want to refer to the following app note and video:

    http://www.ti.com/lit/an/scpa054/scpa054.pdf

    https://training.ti.com/ti-precision-labs-i2c-buffers-overview

    In your case, is there any reason you wouldn't want to connect the devices so that the "A" sides are shared?  An example of this can be seen in Figure 12 of the datasheet.  This figure shows a master device on the "A" side and a slave device on the "B" side, but this is just an example - it would be OK to connect an I2C master device on the "B" side instead.

    Regards,
    Max