Texas Instruments recommends a 4-layer PCB with a solid ground plane and a thermal relief pattern around the device to minimize thermal resistance. A detailed layout guide is available in the TMP275 application note (SLAA701).
The TMP275 has an internal POR and BOR circuitry that resets the device during power-up. To ensure proper operation, it is recommended to add a 0.1uF capacitor between VDD and GND, and a 1kΩ resistor between VDD and the reset pin (if used).
The maximum cable length for the I2C bus depends on the clock frequency and the capacitance of the bus. As a general rule, keep the cable length below 1 meter for a 400 kHz clock frequency. To ensure signal integrity, use a twisted pair cable, add a 1kΩ pull-up resistor to the SCL and SDA lines, and consider using a bus buffer or repeater for longer cable lengths.
The TMP275 has an internal calibration mechanism, but for high-accuracy measurements, it is recommended to perform an external calibration using a precision temperature reference. The calibration process involves measuring the device's output at multiple temperatures and creating a correction table or equation to compensate for any deviations.
The TMP275 has a response time of approximately 10 seconds to temperature changes. This means that the device may not immediately reflect rapid temperature changes. In applications where fast temperature tracking is required, consider using a faster temperature sensor or implementing a software-based temperature filtering algorithm.
TMP275AIDG4 datasheet
by Texas Instruments
