This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

MSP430F2274-EP: ADC10 Temperature Sensor Calibration Data

Part Number: MSP430F2274-EP

Hello,

I am interested in using the built-in temperature sensor on the MSP430F2274-EP, and after reading the datasheet section on it, I had a couple questions. Please find them below.

1. Am I correct in thinking the MSP430F2274-EP does not come with any temperature sensor calibration data in Information Memory Segment A? The user guide made it sound like possibly did have it, but I don't see it in the msp430h2274.h header file.

2. I understand the temperature sensor offset voltage is +/-100 mV, but does  V_Offset,Sensor varies as a function of the ambient temperature. ? In other words, if I could determine a given MSP430F2274 had an offset voltage of 56 mV at 0 C, would it also be 56 mV at -55 C and 125 C? Or could V_Offset,Sensor change to another value at hotter and colder temperatures?

Thanks

  • Hi Adevries,

    For Q1,

    I have a look for datasheet of MSP430F2274-EP, and do not found any calibration value about temperature sensor, thus it should not have this data.

    For Q2,

    The offset do not to modify, you can use this formula to calculate the temperature directly.

    Best Regards

    Johnson

  • Hi Johnson,

    Thanks for confirming there is no temperature calibration data, and explaining how to calculate the temperature using the equations. I'm wondering if V_Offset,Sensor varies as temperature changes because I'm thinking about performing a single point calibration to increase the accuracy of temperature measurements, as suggested by this forum post: https://e2e.ti.com/support/microcontrollers/msp430/f/166/t/873088. If V_Offset,Sensor is stable across temperature, then a single point calibration could help improve accuracy. However, if V_Offset,Sensor varies with temperature, single point calibration won't work as well. So, is it safe to assume that V_Offset,Sensor is pretty stable as temperature changes?

    Thanks

  • Hi adevries,

    Yeah, I think you can assume that V_Offset is stable as temperature changes.

    The test data in the datasheet indicates the difference between devices, so there is no guarantee that the offset of each device is the same.

    Best Regards

    Johnson

  • Hi Johnson,

    Thanks for the info. I'll keep that in mind. It sounds like one way to increase the accuracy of the temperature sensor is to calibrate each microcontroller at a single point. It won't be perfectly accurate, but it should be better.

    Thanks for the help.

**Attention** This is a public forum