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msp430 supply voltage range

user574922
Prodigy 50 points

hello,

In the datasheet of msp430, In "Recommended Operating Conditions" supply voltage is 1.8-3.6V. In "absolute maximum ratings" voltage applied at VCC to VSS is -0.3-4.1V. What is the difference about the two voltage range?

If I supply msp430 at 3.7V unexpectedly about 10 minute, Is there any problem? such as reliability?

thank you!

  • 0
    Guru 74080 points
    You can power your MSP with 3.7V, that's OK as it is within the absolute maximum ratings. TI gives you the recommended operating conditions to let you know what the device is designed for. But it will work with 4V as well, although it becomes a little bit critical since you are about to reach the limit of the maximum rating. Powering the MSP with more than 4.1V can damage it permanently. Remember that voltage regulators have an output voltage +/- some variation. That could be +/- 5% for example. If there would be a regulator that has an output of 4V (never had such a device, anyway) with an error of +5%, your output voltage could be 4.2V in the worst case which is too much.

    Operating your device in the recommended operating conditions will give you additional headroom for those tolerances. But 3.7V is no problem, even if powering the MSP continuously from it.

    It's like a traffic light :-)

    GREEN: 1.8V to 3.6V - go on driving, everything OK
    YELLOW: 3.7V to 4.1V - OK to drive through, but beware as red comes next
    RED: >4.1V - DON'T DO THAT

    Dennis
  • 0
    Guru 33653 points

    I connected by mistake few times MSP430 devices to 5V, and they are still working OK (flashing and executing program). If there are somehow damaged, this is not visible by my side. There are always datasheet note "Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device".

    Anyway, I found many commercial devices where chips are used at absolute maximum ratings. Last one that I found is inside new TI FET, where for applying fuse VPP (6.5V) is used ADG821 with 5V VDD, and 7V VDD as absolute maximum ratings.

  • 0
    TI__Prodigy 100 points
    Datasheet values are only guaranteed as long as you stay within the "Recommended Operating Conditions" (unless otherwise noted).
    On the other hand, the device is not harmed if you operate the MSP within the "absolute maximum ratings".
  • 0 in reply to Sebastian Stumpf
    Guru 227245 points
    Right.
    If powered by 4V, it is guaranteed that it won't break, but it is not guaranteed that it will work as expected as long as >3.6V are applied.
    My colleague too made the experience that even prolonged exposure to 5V supply didn't break the MSP he used, and it seemed to work as expected. But it was getting noticeably hot. And I guess that shorting an output pins without current-limiting would have destroyed it. (significantly increased shortcut current and power dissipation).

    IIRC the old FET430UIF did run its F1612 with 12MHz, far above 8MHz, also way above maximum specs. (at least it did have a 12MHz crystal, which means either excessive 12MHz or unnecessarily slow 6MHz operation)

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