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MSP430G2513 accuracy Vref & Temperature Sensor

ge4126
Prodigy 10 points
Other Parts Discussed in Thread: MSP430G2513

I am planing to use the internal Vref of the MSP430G2513 amongst others for a temperature measurement. According to the datasheet Vref 1,5V has a tolerance of +/-0,9V. So does this mean, that for one chip the Vref varies within the limits over the time, or is it for one chip one fix value between the limits? Supposed it is a fixed value, a one point calibration for the temperaturemeasurement would eliminate the error of the reference voltage and a user-calibration for the reference voltage by measuring Vref on a output pin would be possible?

  • 0
    Guru 227245 points

    ge4126 said:
    Vref 1,5V has a tolerance of +/-0,9V.

    0.09V. 0.9V would be a little too much for reliable operation :)

    ge4126 said:
    So does this mean, that for one chip the Vref varies within the limits over the time, or is it for one chip one fix value between the limits?

    Not over time. But over temperature. The temperature coefficient is +-100ppm/°C.
    Also, it varies with supply voltage. The given range is for VCC=3.0V.

    If temperature and supply voltage are constant, then the reference is at a fixed point. For 3.0V it is between these limits. For different VCC, the limits may be different.

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