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cc8521: CC8521

Part Number: CC8521

Hello,

we are using CC8521 in our board in Host control mode. we have Sam4s to control the CC8521.

recently we figured out that, if we dont connect the CC8521's I2C lines to the MCU/ADC's I2C line, the CC8521 doesnt work.( transmission doesnt work( our wireless communication doesn work)).

as soon as we connect the CC8521's I2C lines to our MCU's I2C line, it works.

since we are not using I2C of CC8521, we are not sure, why this is happening. we expect to have the I2C of CC8521 to be grounded or pull high and communication works.

would you please help us to figure out this issue?

Thanks

Neda

  • Hi Neda,

    You say that you are not using I2C, but you have obviously connected the signals to begin with. Can you explain your setup in more details?

    Cheers,
    Fredrik
  • Hi fredrik,

    As I mentioned, we are not using I2c, to communicate with codec or ADC.

    We have a MCU to control the CC8521.

    In our circuit we set the i2c lines connect d to GND, but that cause issue. In this case the wireless communication doesn't work.

    As soon as we connect the I2c of CC8521 to the I2c bus that I have in the CIRCUIT, it start to work.

    The I2C bus is for MCU communicating with ADC, LEds.

    Thanks

    Neda 

  • Hi Neda,

    What happens if you just leave the I2C pins unconnected? That is the recommended configuration if the pins are not used.

    Cheers,
    Fredrik
  • Hi Fredrik,

    if we connect the I2C to our I2C (MCU), We can have wireless communication between our Master ( our dongle) and our slave ( our board with MCU), but if we leave the I2C pins unconnected we cant have our wireless communication.

    Thanks

    Neda