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dschneeweis
dschneeweis
Associate II
July 10, 2008
Question

HSI at 6MHz

  • July 10, 2008
  • 3 replies
  • 749 views
Posted on July 10, 2008 at 07:25

HSI at 6MHz

    This topic has been closed for replies.

    3 replies

    dschneeweis
    dschneeweisAuthor
    Associate II
    May 17, 2011
    Posted on May 17, 2011 at 12:34

    Hello

    While I was testing a few things with my Olimex STM32-103STK (STM32F103)I measured the HSI clock via the MCO Pin of the Controller. In the datasheet the accuracy the internal 8 MHz factory-trimmed RC oszillator is +-3%. But I measure a frequency of 5.5MHz. I can trim it up to 6.3 Mhz with the HSITRIM value.

    Is this a problem of the (maybe not factory calibrated) µC or is there an other problem? The HSICAL value is 0xb0

    16-32micros
    16-32micros
    Associate III
    May 17, 2011
    Posted on May 17, 2011 at 12:34

    Hi dschneeweis,

    I believe that the device used on this board from Olimex was an early engineering sample, not yet tested at ST production lines and well trimmed to 8MHz as stated in our datasheets. Is it possible to send me the trace code of the chip and revision printed on the package. Thx.

    Cheers,

    STOne-32.

    dschneeweis
    dschneeweisAuthor
    Associate II
    May 17, 2011
    Posted on May 17, 2011 at 12:34

    Hallo

    Sorry for the very late reply. But I was in an other projekt

    The problem accours only on this Controller. Is this only a problem of those earle engineering samples and can we rely on the accurancy of the datasheet if we order parts from now on?

    I don't know what you mean with trace code. On the package is

    STM32F103RBT6 2209P VC MLT 3R 735

    Is this Information enough to verify it as a engineering sample?

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