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MSP430FR2355: The TLV contains calibration data of temperature sensor?

Part Number: MSP430FR2355
Other Parts Discussed in Thread: MSP430FR2533, MSP430FR2476

Hello everyone,

I'm progmamming with MSP430FR2533.

In MSP430FR2533 Datasheet, I can not find the temperature sensor calibration data.

In the datasheet;

ADC internal shared 1.5-V reference, temperature 30°C

And I think this is a calibration data about the internal reference voltage.

But I found in MSP430FR2476 datasheet as:

ADC internal shared 1.5-V reference, temperature sensor 30°C

on just same address. 

I believe this value must be a temperature sensor calibration value.

And only typo to lose word "sensor"!

Please guarantee this value must be a calibrate value of temperature sensor.

B.R.

Massa.

  • Hello Massa,

    Please refer to the MSP430FR4xx2xx family users guide, section 1.13.3.3. for information about temperature sensor calibration.

  • Hi Massa,

    I checked our internal data and your are correct the data on address 0x1A1A and 0x1A1C ADC temperature sensor calibration value at 30 degC and 85 degC with VREF = 1.5V.

    This a typo we will fix thanks for the hint!

  • Hello Dietmar,

     

    Excuse me for cutting in, but my understanding is following.

    (1) According to FR2355 datasheet (Rev.D,SLASEC4D), ADC internal shared reference is described as following.

     


    In above table, it isn’t shown 85℃ at high temperature and this calibration value is device dependent at 105°C from note(3).

    About the FR2355 ADC internal shared reference at high temperature,

    Which is the condition at 85℃ or 105℃?

     

    (2)Can we use FR2355 ADC internal shared 2.0-V reference as temperature sensor calibration data?

    If possible, is calculation formula same as FR2676 sample code(msp430fr247x_ADC12_16.c) that is using 1.5V-reference ?

    Also is there any concern on using 2.0-V reference as temperature sensor calibration ?

     

    Regards,

    Tao_2199

  • Hi Tao,

    so on the FR2355 datasheet (Rev.D,SLASEC4D) the word sensor is also missing and the data are refering to 105 degC because teh FR2355 is a 105 degC device.

    My post before referred to FR263x datasheet SLAS942E which is a 85 degC device.

    To the 2nd aspect of your questions. Yes you can use the 2V temp sensor calibration data according the description in user guide but have to align delta temperature accordingly. With small alignments on temperature the code example can be used.

  • Thanks a lot.

    I can understand as follows:

    1. In MSP430FR2xxx, we can find 85 degree and 105 degree devices.

    2. All devices contain temperature calibration data.

    3. The high temperature of the calibration data is depend on a device.  We must check reading the datasheet.

    4. The calibration data "temperature 30°C" means "temperature sensor 30°C" in Data-sheets.

    5. The formula from ADC value to temperature is depended on a device.

    I can use the calibration value to measure the temperature.

    B. R.

    Massa.

  • Massa,

    thanks for the summary your understanding is correct.

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