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TCA9548A: Address allocation problem

HY yang
Expert 1980 points
Part Number: TCA9548A

There are mainly two questions that need your help to confirm:
1. As an extended I2C chip, if the address of tca9548pwr is set to 0x70 (or other fixed address), can the address of I2C device mounted on the extended 8-channel I2C bus not be 0x70?
2. Since the PCB has been proofed, at present, tca9548pwr A0, A1 and A2 are grounded, and the address is 0x70, there will be address conflict in application.
The PCB is connected as follows: A0 and A1 are short circuited with reset and pulled up to 3.3V through a 10kohm resistor, A2 is connected to GND, and the address changes to 0x73. Is it OK?

  • 0
    Expert 1980 points

    Add schematic diagram. Please confirm as soon as possible. We are waiting for the results to modify our PCB.

  • 0
    TI__Guru 59980 points
    HY yang said:
    1. As an extended I2C chip, if the address of tca9548pwr is set to 0x70 (or other fixed address), can the address of I2C device mounted on the extended 8-channel I2C bus not be 0x70?

    Correct. The downstream devices on the secondary channels should not be the same address as the TCA9548A.

    HY yang said:
    2. Since the PCB has been proofed, at present, tca9548pwr A0, A1 and A2 are grounded, and the address is 0x70, there will be address conflict in application.
    The PCB is connected as follows: A0 and A1 are short circuited with reset and pulled up to 3.3V through a 10kohm resistor, A2 is connected to GND, and the address changes to 0x73. Is it OK?

    Yes, this is fine. 

    -Bobby