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MSP430F233: MSP430F23X Application Inquiry

Renan Santos Adriano
Mastermind 18055 points
Part Number: MSP430F233

Hello Team,

Posting on behalf of my customer:

I am using a MSP430F23X powered at 3.3V, with 3.3V outputs.  However, i have a number of inputs that are 1.8V.  Will this MC accept 1.8V inputs in this setup?

The datasheet is unclear, as it states for a VCC of 3V, there is a MIN & MAX for positive-going input threshold voltage. Usually, there's just a minimum, and when the input voltage exceeds that minimum, it counts as a 1. This is especially true of schmitt-triggers. I don't know what to make of this "range." A 1.8V input signal falls smack in the middle of this range. Does it need to exceed the MAX of 2.25V ?

Regards,

Renan

  • 0
    TI__Intellectual 2745 points

    Hello,

    I believe the value being referred to is VIT+. In order to trigger High, or as a 1, the positive-going input threshold voltage must be between 1.35V and 2.25V for a VCC of 3V. This is due to hysteresis. For a similar reason order to switch to Low, the negative-going input threshold voltage must be between 0.75V and 1.65V for a VCC of 3V. 

    You can find more information on Schmitt-triggers and why the values are set up that way in this Application Brief.

    Thank you,

    Susan

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