Texas Instruments recommends a 4-layer PCB with a solid ground plane on the bottom layer, and a thermal relief pattern on the top layer to minimize thermal resistance. Additionally, keeping the sensor away from heat sources and using thermal vias can improve thermal performance.
The TMP275's output can be noisy due to its high sensitivity. To filter out noise, a low-pass filter with a cutoff frequency of around 10 Hz can be used. Additionally, averaging multiple readings or using a digital filter can also help reduce noise.
The TMP275 does not require calibration, as it is factory-calibrated. However, if high accuracy is required, a 2-point calibration can be performed using a precision temperature source and a multimeter. The calibration data can then be stored in an external EEPROM or microcontroller.
To ensure accurate temperature readings in high-temperature environments, it is essential to use a thermally conductive interface material (e.g., thermal tape or thermal grease) between the TMP275 and the heat source. Additionally, ensuring good airflow and using a heat sink can help reduce thermal gradients.
The maximum cable length for the TMP275's digital output depends on the specific application and the noise environment. As a general rule, cable lengths up to 10 meters can be used, but it is recommended to use a twisted pair cable and to add termination resistors to minimize signal degradation.
TMP275AIDGKRG4 datasheet
by Texas Instruments
