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TI Home » TI E2E Community » Support Forums » Microcontrollers » MSP430™ Microcontrollers » MSP430 Ultra-Low Power 16-bit Microcontroller Forum » MSP430F5438A IOs
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  • MSP430F5438A IOs

    MSP430F5438A IOs

    This question is answered
    berms03
    Posted by berms03
    on Apr 27 2012 16:42 PM
    Intellectual970 points

    I've been looking over the datasheet and had a couples questions about the MSP's IOs.  What can the IO's supply, current wise.  I see on the datasheet 5mA, but I also see 15mA.  And then I see a note at the bottom saying the max IO's can't exceed 48mA, but then right below that it says IO's can't exceed 100mA.  Is there a configuration on how the IO's are set?  My second questions is what is the min voltage that the MSP will detect a high.  The datasheet says VCC-0.25V and it also says VCC-0.60V? The same with the Max low voltage?  

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    • TonyKao
      Posted by TonyKao
      on Apr 27 2012 23:20 PM
      Verified Answer
      Verified by berms03
      Genius3770 points

      Hi there, 

      If you read the datasheet carefully,  it says it's the max current for the specified voltage drop. There are two voltage drops specified.

      Tony

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    • TonyKao
      Posted by TonyKao
      on Apr 27 2012 23:23 PM
      Genius3770 points

      Also, the voltages required for different logic levels are found in the Input sections of the datasheet.

      Tony

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    • berms03
      Posted by berms03
      on Apr 30 2012 08:20 AM
      Intellectual970 points

      I could not find the voltages required for different logic levels. Could you direct me to a page number?  The only place I could find INPUTS was under the schmitt trigger inputs, and it doesn't not specify a voltage range.  

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    • Jens-Michael Gross
      Posted by Jens-Michael Gross
      on Apr 30 2012 12:25 PM
      Guru141810 points

      berms03
      The only place I could find INPUTS was under the schmitt trigger inputs, and it doesn't not specify a voltage range.  

      THis is because the MSp input pins are Schmitt-Trigger pins and this kind of pins has no simple voltage range. It ratehr has two ranges for high-going-voltage and low-going voltage and a hysteresis in-between.
      I suggest looking up schmitt-trigger in Google.

      _____________________________________
      Before posting bug reports or ask for help, do at least quick scan over this article. It applies to any kind of problem reporting. On any forum. And/or look here.
      If you cannot discuss your problem in the public, feel free to start a private conversation: click on my name and then 'start conversation'. But please do so only if you really cannot do it in a public thread, as I usually read all threads. And I prefer to answer where others can profit from it (or contribute to it) too.

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