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TPS23861: I2C address for 1pcs TPS23861

Wu JW
Intellectual 2935 points
Part Number: TPS23861

Hi, Team,

Customer feedback: When they use 1pcs TPS23861 in their project, A3 is connected to GND, the TPS23861 only response when I2C address as 0X00. But in our datasheet, it should be 20H. Why?

When customer use >2pcs TPS23861 in other project with similar project, the TPS23861 will have the response by broadcast the I2C address as the datasheet said.

  • 0
    TI__Genius 15685 points
    Hi JW,

    The default address should be 0x20 if A3 is connected to ground. 0x00 is I2C general call address which means all devices would respond to 0x00. Can you ask the customer to connect their board with USBTOGPIO and use GUI to verify the address? Thanks.

    Best regards,
    Penny
  • 0 in reply to Penny Xu
    Prodigy 20 points

    Hi Penny：

         We can't finish the validation you said，so we don't have USBTOGPIO,only TPS23861EVM board.But in my designed product,use a pieces of TPS23861,only 0x00 address have a response .

    this is my sch

  • 0 in reply to jingheng Xie
    TI__Genius 15685 points

    Hi Jingheng,

    A couple comments on the schematic:

    1. There's no need to have a resistor at gate pin. Please remove it.
    2. Can you check if you have digital isolator designed correctly? Pull-up resistors are needed for SDA and SCL line.
    3. Can you check the 3.3V power supply circuit? Please make sure the power on sequence described in this app note:http://www.ti.com/lit/an/slva723/slva723.pdf is met.

    Thanks,

    Penny

  • 0 in reply to Penny Xu
    Prodigy 20 points

    Hi Penny：

        1. Have a resistor at gate pin is not affect to read and write register with I2C interface .

        2.In our design ,haven't use digital isolator, the mcu and tps23861 is Point to point connected.SDA and SCL line heaved 2.2K Pull-up resistors for use.

        3. 3.3V VDD is no problem with power supply.

    There are no problems with product design,Because we're already selling.I want to know,When use 1pcs TPS23861 , A3 is connected to GND, the TPS23861 only response when I2C address as 0X00. why? why? why? I check other I2C address including 0x20,there was no response.You can try agin.

  • 0 in reply to jingheng Xie
    TI__Genius 15685 points
    Hi Jingheng,

    We have tested with TPS23861EVM-612. If we only install one TPS23861 device on the board, we still can communicate with the device through default address (0x20 with A3 pin connected to ground) with PI commander GUI. There might be something wrong with your hardware or software causing this problem. You can either run your software with TPS23861EVM-612 or use PI commander GUI to run with your hardware to isolate the problem. Thanks.

    Best regards,
    Penny