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 TMP124's output can be noisy due to its high sensitivity. To filter out noise, a simple RC 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 TMP124 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.
For high-temperature applications, it's essential to ensure good thermal contact between the TMP124 and the heat source. This can be achieved using thermal interface materials, such as thermal tape or thermal grease. Additionally, using a thermocouple or other temperature reference can help compensate for any temperature errors.
The maximum cable length for the TMP124's digital output depends on the specific application and the noise environment. As a general rule, Texas Instruments recommends keeping the cable length as short as possible (less than 10 cm) to minimize noise and signal degradation. If longer cable lengths are required, using a differential signal or a signal repeater can help improve signal integrity.
TMP124AIDR datasheet
by Texas Instruments
