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Digital interface to microwave chip

Sreejith Venugopal
Prodigy 220 points

Hi

If we need to interface a digital line like I2C from a micro controller to a microwave chip, how do we give the supply of pull up resistor for I2C line? Shall we use supply of Micro controller or Microwave chip to connect pull up resistor? Assume pull up resistor is near to microwave chip and a dedicated LDO is used for micro controller.

Regards

Sreejith

  • +1
    TI__Mastermind 26806 points

    Sreejith,

    The answer to this depends on a few factors, including the threshold voltages of the chips in consideration here. You should pick the pull-up that ensures that high-level signals are above VIH for devices on the bus, and that low level signals are low enough to be below VIL on the bus's devices. Also ensure the pull-up is not too high for any of the devices on the bus. If both rails are the same voltage then I don't have any reason to certainly tell you to use one over the other.

    Best,

    Danny