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MSP430F6745: I have a question about the waiting time of COMP_B.

Expert 2780 points
Part Number: MSP430F6745

I have a question about the waiting time of COMP_B.

When REF is OFF, when COMP_B is turned ON, it is necessary to wait until REF stabilizes.

This standby time is tSETTLE (TYP 75us).
Even with a bad device at high temperature, how long should I wait?
(The higher the temperature, the more delay time required tends to increase)

Currently we are thinking about 500 μs, is it enough?

Regards,
Da

  • Hi Da,
    thanks for your question. The settling time of the reference is getting faster at higher temperatures. So if low temperature is not a use case for your application, you can use values which you see at room temperature. This will be the worst case for your application. Also, the spread between good and bad devices won't be really high.

    Best regards,
    Tobias
  • Hi Da,
    I'm wondering if my information could help you, please let me know if not. Since we don't have a maximum value in our specification, I can't give you a concrete value for this.
    Please note, that this will also depend on your board setup if you have the reference voltage connected to an external IO pin (mainly driven by your board capacitance). That's why I would propose that you check the settling at your application and define a maximum waiting time. As I said, settling at higher temperatures will be faster. So you can set the waiting time based on your observations at room temperature.

    Best regards,
    Tobias
  • Hi, Tobias

    Since the equipment may be used outdoors, less than room temperature is sufficiently conceivable.
    Even in this case, is there a difference between a normal device and a bad device?

    Best Regards,
    Da

  • Hi Da,
    no, you should not expect a high deviation of this parameter at different devices.

    And as I mentioned before, low temperature will be worst case for this as settling will be slower.

    Best regards,
    Tobias

  • Thank you for your response.
    This problem was solved successfully.

    Best Regards,
    Da