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DS90UB941AS-Q1: I2C operation

Jiawei Hu1
Expert 6115 points

Part Number: DS90UB941AS-Q1

Hi team,

When 941 works at splitter mode, 941>>2*928, can the I2C address of two 928 be same? If it can be same, do we have the reference code? Now, customer can not access port1 928 I2C when two 928 I2C address are same.

BR

Jiawei

  • 0
    TI__Guru** 103215 points

    Hello Jiawei,

    The method to handle this is:

    Write 941AS reg 0x1E = 0x01 to select port 0 

    Write 941AS reg 0x03 = 0x9A to enable I2C passthrough on port 0

    Write 928 reg 0x00 to override the address of the 928 on port 0 to a different I2C address (make sure to set bit 0 to enable address override) 

    Write 941AS reg 0x1E = 0x02 to select port 0 

    Write 941AS reg 0x03 = 0x9A to enable I2C passthrough on port 1

    Write 941AS reg 0x1E = 0x03 to select both ports 

    Now you should be able to talk to port 0 DES by using the overridden address, and port 1 DES by using the strapped address

    Best Regards,

    Casey