3 Board Layout

The PCB is a four-layer board which includes a power regulator, the TMP390 sensor, all of the necessary auxiliary circuitry, and various test points. The portion of the board where the sensor and resistors is located may be broken off for evaluation separately from the rest of the EVM. This breakout board was minimized in size to reduce the thermal mass for improving the thermal response of the TMP390. Further layout considerations in the final design using the TMP390 can be taken into account depending on the application. Refer to Temperature Sensors: PCB Guidelines for Surface Mount Devices (SNOA967) for design and layout recommendations for temperature sensors. The breakout board includes resistors rated up to 150°C for high-temperature testing as well as the decoupling capacitor, C7, which is placed closely to the TMP390. Note that this PCB will not withstand temperatures of 150°C for extended periods of time because it was not manufactured with high-temperature material.