A 4-layer PCB with a solid ground plane and a separate power plane is recommended. Keep the analog and digital grounds separate and connect them at a single point. Use a 10nF decoupling capacitor between VCC and GND, and a 100nF capacitor between AVCC and AGND.
Use a thermocouple or a thermistor with a high accuracy rating. Ensure good thermal contact between the sensor and the device. Use a low-pass filter to remove noise and oscillations. Calibrate the temperature measurement using a known reference point.
The maximum allowed voltage on the analog input pins is VCC + 0.3V. Exceeding this voltage may damage the device. Use voltage dividers or clamping circuits to limit the input voltage.
Use shielded cables and connectors for analog signals. Keep the analog signal path away from digital signals and power lines. Use a ground plane and a Faraday shield to reduce electromagnetic interference. Add a low-pass filter or a ferrite bead to the analog signal path.
The recommended clock frequency for the I2C interface is 100 kHz to 400 kHz. Faster clock frequencies may cause data corruption or errors. Use a clock stretching mechanism to ensure reliable data transfer.
