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TCA9803: Confirmation Request of application circuit

Shinichi Inoue
Guru 21646 points
Part Number: TCA9803

Dear Specialists,

My customer is considering TCA9803 and has a question.

I would be grateful if you could advise.

---

I am considering TCA9803DGKR. 

(1) Connect the A side of TCA9803 to the I2C master device side (in this case, the microcomputer side).
I'm thinking of connecting the B side to the B side of the 9803, which is also mounted on the slave device, and connecting the A side to the slave device side.

(2) Is it okay to connect multiple slaves in the configuration of (1)?

Could you please see the block diagram below.

ｰｰｰ

I appreciate your great help in advance.

Best regards,

Shinichi

  • 0
    Guru 316690 points

    Mutiple TCA980x B sides cannot be connected together; see section 10.1.2.2 of the datasheet.

    Swap A and B on the two right buffers (and remove the pull-ups on the B sides). This is similar to the example in section 10.2.4 of the datasheet, but with multiple A sides (which is allowed).

  • 0 in reply to Clemens Ladisch
    TI__Guru 72711 points

    Hi Shinichi,

    Just to echo Clemens (He's correct btw), B sides of TCA9803 cannot connect to each other. Flipping the devices on the right to make B side face the I2C responder devices is the suggested solution unless there is a reason why you can't.

    -Bobby

  • 0 in reply to BOBBY
    Guru 21646 points

    HI Clemens and Bobby,

    Thank you for your reply.

    I understand TCA9803 doesn't allow connect B side each other.

    I'll share this information with the customer.

    If the customer has an additional question, I consult you again.

    I appreciate your great help and cooperation.

    Best regards,

    Shinichi

  • 0 in reply to Shinichi Inoue
    Guru 21646 points

    Hi Clemens and Bobby,

    I sent your suggestion to the customer.

    They'd like to confirm the Fugure listed below.

    Is there any probblem.

    I appreciate your great help and cooperation.

    Best regards,

    Shinichi

  • 0 in reply to Shinichi Inoue
    TI__Guru 72711 points

    Hi Shinichi,

    This looks fine to me. 

    If you want a more thorough schematic review offline you can reach me at duynguyen@ti.com

    -Bobby

  • 0 in reply to BOBBY
    Guru 21646 points

    Hi Bobby,

    Thank you for your reply.

    I understand the block looks good.

    I'll share this information with the customer.

    When the customer needs to review the precise schematic, I send the e-mail you informed.

    I appreciate your great help and cooperation.

    Best regards,

    Shinichi