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DS90UB925Q-Q1: DS90UB925 EVM J4 question

AJ Cheng
Genius 3615 points
Part Number: DS90UB925Q-Q1
Other Parts Discussed in Thread: ALP

Dear Sir.

Good day.

The J4 (I2C interface) on the EVB should be the interface for inputting the I2C command.

Why is the RX board information on the software disconnected when J4 is connected to the external I2C?

Is it because I2C and USB cannot be shared at the same time?

  • 0
    TI__Mastermind 21685 points
    Hello,
    >>Why is the RX board information on the software disconnected when J4 is connected to the external I2C?

    When J4 is connected an external I2C, you have two masters on the bus. One is the onboard Atmel processor and the other is the external MCU you are connecting. Both masters should support I2C multimaster arbitration. Otherwise there would be conflict and you would loose connection. I think that's what you are seeing.

    Are you using ALP and seeing ALP getting disconnected when you connect a 2nd master on the I2C?

    Thanks,
    Vishy