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MSP430f2416 How to measure 32kHz crystal frequency

Other Parts Discussed in Thread: MSP430F2416

Hello,

For my application, I use a MSP430f2416 clocked by an external 32kHz crystal connected to Xin/Xout pins. I would like to compensate by software the drift of a 20ppm crystal, that why, I need to measure the crystal frequency. So my question is : Can I put a pad on the PCB connected to xout pin in order to measure the exact crystal frequency?

Thank's in advance

regards

  • pazcal pazcal said:
    Can I put a pad on the PCB connected to xout pin in order to measure the exact crystal frequency?

    You can, but I wouldn't. By doing this, you are affecting the load capacitance of the crystal oscillator circuit when you probe the pad. This can change the frequency slightly, making your measurement have an added (otherwise non-existent) error.

    A better method would be to place a probe pad on P2.0 GPIO pin. Program this pin to output the ACLK signal and measure the frequency there.

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