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Original question:

MSPM0C1104: The need for Reset capacitor and pull-up resistor!?

MSPM0L1306: Changing the capacitor on the NRST pin

O.H
Mastermind 6730 points
Part Number: MSPM0L1306


Tool/software:

Hi experts,

Q1:Will it be okay to change the capacitor on the NRST pin from 10nF to 1uF?

Q2:If there is no problem, are there any concerns?
(Notes on the transition times of Low-to-High and High-to-Low, notes on JTAG connection, etc.)

I could not find any recommended values ​​other than 10uF in the datasheet or the "MSPM0 L-Series MCUs Hardware Development Guide (Rev. A)", so it would be helpful if you could let me know.

Best regards,
O.H

  • +1
    TI__Mastermind 29105 points

    Hello O.H,

    May I ask why the capacitor is wanting to be increased?   

    As indicated in the documentation, 47k ohm pull-up and a 10nF cap are our recommendation for most applications but It's not a strict spec in the datasheet.  I believe these values were chosen to provide a quick time constant, being easy for any device to quickly pull low, and to provide some protection for high frequency noise.  

    I think the customer can try a different capacitor value and it probably should work, but It's possible that some of the programming tools might not pull nRST low long enough to account for a larger cap.  I can't really say for sure.  They may just need to be open to testing it and seeing during their development.    

    I hope this helps, 

    JD

  • 0 in reply to JD Crutchfield
    Mastermind 6730 points

    Hello JD,

    Thank you for your supports. I understood.

    The purpose is to reduce costs. It would be counterproductive if it couldn't be programmed, so we will thoroughly testing/verify it.

    Best regards,
    O.H