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MSP430FR2433: 1.8V operation guarantee of peripherals.

Kaka
Guru 24520 points
Part Number: MSP430FR2433


Hi TI Experts,

Please let me confirm the following question.
[Question]
Can customer use the peripherals in MSP430 device except ADC when the supply voltage is 1.8V?

According to the datasheet, it dose not dined the spec when MSP430 work in 1.8V. Also I know that they need to supply the 2.0V in order to release the reset. So after power-up, they will change the voltage from 2.0V to 1.8 V and disabled the SVS function to avoid the reset.
If you have any questions, please let me know.
Best regards.
Kaka

  • 0
    Guru 317500 points

    The specification in section 5.3 applies to all modules that do not have their own supply voltage specification.

    Only the ADC module has its own supply voltage specification. (All other modules are explicitly specified "over recommended ranges of supply voltage".)

  • 0 in reply to Clemens Ladisch
    Guru 24520 points
    HI Clements,

    Thank you for your comments. I understand the mean you pointed.
    But I found that the voltage level or time is vary for supply voltage. So, how should customer think this point?

    Best regards.
    Kaka
  • 0 in reply to Kaka
    Guru 317500 points
    I do not understand your question. Is the voltage inside the commended range, or not?
  • 0 in reply to Clemens Ladisch
    Guru 24520 points
    HI,

    I apologize for your confusion due to my poor explanation. I think the electrical specification should be vary according to the supply voltage.
    For example, the parameter of "Positive-going input threshold voltage" is as below.
    Min : 0.90V@2.0V, 1.35V@3.0V
    Max : 1.50V@2.0V, 2.25V@3.0V
    This threshold is vary according to the supply voltage. So, I think this specification should be as below.
    Min: 0.45 * Vcc
    Max: 0.75 * Vcc

    Best regards.
    Kaka
  • 0 in reply to Kaka
    Guru 317500 points

    I guess TI does not test the thresholds at other voltages. Just extrapolate to 1.8 V, and add a little safety factor.

    In practice, CMOS signals will be at the power rails anyway (something like 0.01 × VCC / 0.99 × VCC).

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