MSP430FR6043: Precise frequency measurement

Part Number: MSP430FR6043

Hello there,

I found MSP430FR604x which seem as very good candidates for precise frequency measurement rather than regular MCUs which are slow (nanosecond resolution). I would like to hear your opinion to this measurement requirements.

I need to measure frequency ranging 1-2 MHz of a square signal with averaging over the period of 50 usec.

time measurement resolution: <1ns

period of one measurement: 50 usec

I need to measure frequency from number of edges of input square wave signal during this period (50 usec).

I would use MSP430FR604x as described: High-precision time measurement resolution of ​<5ps

Q1: Can MSP430FR604x be used for such measurements?

Q2: Is there any working example for similar pulse signal measurements?

Q3: How does MSP430FR604x measurement method works?

Thank you for any help.

Best regards,

Michael

  • Hi Michael,

    I do not think the MSP430FR604x can be used in this application. What you need is a high sampling rate ADC. Our integrated ADC is 8MSPS, can not meet your time measurement resolution requirement.

    The description of High-precision time measurement resolution of ​<5ps is saying the resolution of dTOF result <5ps. It uses software method to get this high accuracy. It is not helping in your application.

    Best regards,

    Cash Hao

  • Thank you for answer.

    Would you suggest any device which may fulfill this role? Possibly how would fast ADC work in this application? Sampling square signal at different frequency and reporting it in what format?

    Thanks,

    Michael 

  • Hi Michael,

    Since your time resolution is <1ns. You might need a >1GSPS ADC to sample the square signal. You can try with this ADC12SJ1600-Q1. It is just a suggestion. I am not an ADC expert, there might be a better choice in your application.

    Best regards,

    Cash Hao

  • Thank you Cash for you answers.

    Michael