• State Resolved
  • Locked Locked
  • Replies 4 replies
  • Subscribers 79 subscribers
  • Views 565 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

MSP430G2452 cannot go to HF, with external crystal so...

kazola
Guru 18625 points

... I have to get an improved MSP430 because the VLO does not fit my needs.

  1. So which is the next step in the MSP430 series which still is pluggable on the TI Launchpad do you recommend and has this feature?
  2. Also, which development board and/or MSP430 are you currently using? And why? :) (perhaps I can convince my boss).
Let me know your opinions!
Thanks!
And happy friday!
  • 0
    Genius 3770 points

    Hi Kazola,

    What is your frequency tolerance needs? The internal DCO of the G2xx family can be relatively stable (over temperature anyway, voltage is another matter...) and accurate once calibrated with an external precise clock (for example the watch crystal included with the Launchpad).

    See the msp430g2xx3_dco_flashcal.c example for details.

    Tony

  • 0 in reply to TonyKao
    Guru 18625 points

    Hi!

    This is great Tony!

    I'm already studying the code you've told me. All I have to do is to put my source code instead of:

     while (1)
     {
     P1OUT ^= 0x01; // Toggle LED
     for (i = 0; i < 0x4000; i++); // SW Delay
     }

    I'm already doing new measures with it. Thanks!

    In fact the problem is not the stability, it is the accuracy. Jens-Michel told me in another post the VLO is quite... unprecise. Also, we expect to have some voltage variances, as my hardware department has commented me :( On the other hand... would you be so kind to answer my original question? Which is a more complete option to attach to the launchpad?

  • 0 in reply to kazola
    Genius 3770 points

    Hi Kazola,

    The Launchpad has this tiny little EZ430 debug "header" in 1.27mm pitch, the same as the Chronos or the other EZ430 boards. So if you hunt down one of those 6-pin 1.27mm male headers then you can connect any of the EZ430 breakout boards.

    If you're looking for something with flexible clock, then I would suggest looking into the F5xx family which has integrated FLL to stabilize the DCO to almost arbitrary frequencies, REFO which is more accurate than VLO but still nowhere near a crystal, as well as both LF and HF crystal support.

    But I'm sure if you talk to TI sales they'll give you better propaganda I mean pitch, and maybe even some freebies ;)

    Tony

  • 0
    Guru 227245 points

    kazola said:
    ... I have to get an improved MSP430 because the VLO does not fit my needs.

    Sure, teh G series lacks the HF oscillator circuit, so it can only operate a 32768Hz watch crystal.

    However, prior experiments have shown that you can feed a HF TTL signal into XTIN, despite the fact that the datasheet limits the input there to 50kHz.
    So if you use an external quartz oscillator rather than a crystal, the 'Gs' should work.
    But of course, since this is outside the datasheet specs, it may be subject to change without notice. :)

**Attention** This is a public forum