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LMT01: LMT01:The rapid change of temperature

Part Number: LMT01

hi,

my application has a condition:  rapid change of temperature  from 95deg to 25deg(room temperature)

or heating from 25deg to 90deg (about 8sec)

If the rapid change of temperature,  LMT01's data will it be wrong  transfer to MCU? or error data because the temperature change rapid?

i just want to know that the temp change sudden LMT01's data would be wrong?

another question:

 I used NTC that heating time was 5sec, but used LMT01 heating was 5sec.

thanks.

  • Hi Yisyuan,

    LMT01 needs at least 50ms conversion time to convert temperature during the device senses the current temperature, and it needs at least another 50ms to transmit the pulse train output. LMT01 doesn't care if the temperature environment is suddenly changed. Please refer to figure 19-21 for thermal reponse temperature.

    The thermal response time is depended on the size, geometry, and materials used for each device. NTC might have a faster thermal response time due to their size.

    Aaron
  • Hi Aaron,

    I have a question for application.

    If LMT01 touch on stainless steel bottle, glass bottle, or plastic bottle. ..etc.

    Do different media cause different sampling interference?

    I find LMT01 touch on stainless steel bottle, the sampling interference is very large,

    I need change low pass filter  from 0.01uF to 0.1uF for  reduce the noise.

    thanks.

  • Hi Yisyuan,

    Yes you are correct. Different material has different thermal conductivity coefficient properties. For this reason, it may have a slower response time for example the plastic material.

    Could you please provide me the waveform when you saw the noise?

    Aaron
  • Hi Aaron,

    The waveform as below.

    LMT01 touch on stainless steel bottle. (pls see the arrowhead.)

    When touch the bottle, the interference will be more obvious.

    Could it affect the sampling data for MCU?

    Thanks.