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LMT70EVM

Other Parts Discussed in Thread: LMT70, MSP430F5528

How is the MSP430G5528's ADC configured to achieve the required resolution to maximize the LMT70?

Yours Simon M.

  • Hi Simon,

    Someone will get back to you with answer.

    Aaron
  • Hi Simon,

    The MSP430F5528 is set to sample every 50ms and the voltage reference used is 1.5V. I recommend putting a small capacitor, around 10nF or so, right before the input pin of the ADC. This will allow charge to flow into the ADC from the capacitor instead of directly from the output of the LMT70. This is because the LMT70 has weak output drive and if sampled very quickly can drain the charge from the output and reduce the voltage which results in a higher temperature reading.

    On the software side, see the MSP430F5528's Family Guide section 1.13.5.1-3, these sections explains how to perform reference, gain, and offset calibration by using the internal calibration constants in the TLV table. The TLV table is found in section 1.13.2.

    -Michael Wong
  • Great response Michael, the answer I was looking for and then some!

    Thanks for the help.

    Yours Simon M.