To minimize noise and ensure accurate readings, it's recommended to follow a star-grounding layout, keep the analog and digital grounds separate, and use a solid ground plane. Route the analog signals away from the digital signals and keep the clock signal as short as possible. Additionally, use a low-ESR capacitor for the VCC pin and a 0.1uF capacitor for the REF pin.
For 3-wire RTD connections, connect the RTD sensor to the Ain+ and Ain- pins, and the sense wire to the SENSE pin. For 4-wire RTD connections, connect the RTD sensor to the Ain+ and Ain- pins, and the sense wires to the SENSE+ and SENSE- pins. Ensure the correct configuration is set using the CFG register (bits 5-4).
The maximum cable length for the RTD sensor connection depends on the cable type, noise environment, and desired accuracy. As a general rule, keep the cable length as short as possible (less than 10 meters). Longer cable lengths can introduce noise and affect accuracy. Use shielded cables and twisted pairs to minimize noise and ensure accurate readings.
The internal oscillator frequency drift can be handled by using an external clock source or by calibrating the internal oscillator using the CAL register. Additionally, consider using a crystal oscillator or a more accurate clock source if high accuracy is required. Temperature and voltage variations can be compensated for by using temperature and voltage monitoring circuits.
Calibrate the ICM7212AIPL by using a precision temperature reference source and measuring the output voltage at multiple temperatures. Use the CAL register to adjust the internal calibration coefficients. Consider using a 3-point calibration method (e.g., 0°C, 50°C, and 100°C) for high-accuracy temperature measurements.
ICM7212AIPL datasheet
by Maxim Integrated Products
