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MSP430I2040: what is the requirement of capacitor connected at VREF pin when external voltage reference is used?

Zhiyong Li (FT)
Expert 2610 points
Part Number: MSP430I2040

Tool/software:

Hi,

In the datasheet, it is stated that a 100nF capacitor must be connected at VREF pin when internal reference is used, but nothing is said about such capacitor when external reference is used. Could someone please clarify if such capacitor is still needed?

Thanks,

ZL

  • +1
    TI__Mastermind 27240 points

    Hello,

    I don't believe any external cap is required when using an external reference. 

    When using the internal reference, the external cap is needed for the internal voltage regulator.  When using external reference, the internal regulator is disabled.  

    Thanks,

    JD

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