Texas Instruments recommends a 4-layer PCB with a thermal pad connected to an internal ground plane to ensure good thermal conductivity. The device should be placed near the thermal source, and thermal vias should be used to connect the thermal pad to the internal ground plane.
The TMP124AIDG4 has a built-in POR and BOR circuitry that resets the device during power-up or brown-out conditions. To handle this, ensure that the device is powered up slowly (dv/dt < 10 mV/μs) and that the supply voltage is stable before starting to read temperature data.
Texas Instruments recommends a 2-point calibration procedure: calibrate the device at 0°C and 100°C using a precision temperature source, and then use the resulting calibration data to calculate the temperature reading. The calibration data can be stored in an external EEPROM or microcontroller.
To ensure accurate temperature readings, use a low-pass filter to filter out high-frequency noise, and consider using a shielded cable or twisted pair wiring to connect the device to the microcontroller. Additionally, use a stable and noise-free power supply, and ensure that the device is not exposed to electromagnetic interference (EMI).
The maximum cable length for the TMP124AIDG4's digital output depends on the specific application and the signal integrity requirements. As a general guideline, Texas Instruments recommends keeping the cable length below 10 inches (25 cm) to ensure reliable data transmission.
TMP124AIDG4 datasheet
by Texas Instruments
