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Found 2 results

  1. curtis63

    MSP430G2553 PWM Accuracy

    I need to have a very accurate PWM frequency generated with my MSP430G2553IRHB32R. I'm shooting for 25.1khz. However, when running on different boards, I can see variances of up to 3khz in the frequency. I understand this is due to the slight inaccuracy in the processor's internal clock. So, I would like to attach an external crystal or oscillator to it but don't know how. I've read a couple places that say that this chip doesn't support a crystal, but that I could use an oscillator. The questions I have is how does one connect the oscillator, and what code changes are necessary to take advantage of the oscillator? Thanks.
  2. nathancrum

    MSP430FR5969 DCO Accuracy

    Just as an FYI - I was concerned about using the built in DCO in the FR5969 for UART because the spec sheet says although it's factory trimmed, it's still +/-3.5%. Generally it needs to be within 2% for a UART to work correctly so I measured the two FR5969's I have on our 2.4GHz frequency counter and this is what I got. 2 is obviously not a big sample size, but the frequency trimmed DCO on the FR series looks pretty good @ room temp and 8MHz or under. I found another doc from TI that's a comparison between F5xxx and FR5xxx and it mentions the DCO is generally within 2% "within a restricted temperature range" and within 3.5 in the full temperature range (-40C to 85C). I may need to re-measure at 4C because that's typically where our project will be operating.
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