The recommended PCB layout for the MPX4100AP involves placing the sensor on a dedicated analog ground plane, keeping the analog and digital grounds separate, and using a low-pass filter to reduce noise. A 4-layer PCB with a dedicated ground plane is recommended.
The MPX4100AP requires a two-point calibration process. First, apply a known pressure (e.g., atmospheric pressure) and measure the output voltage. Then, apply a second known pressure (e.g., a calibrated pressure source) and measure the output voltage. Use these two points to calculate the sensor's sensitivity and offset.
The MPX4100AP is designed to measure pressures up to 100 kPa (14.5 psi). However, it's essential to note that the sensor's accuracy and linearity may degrade at pressures above 50 kPa (7.25 psi).
The MPX4100AP has a built-in temperature sensor that provides a temperature output voltage. Use this output to compensate for temperature effects on the pressure measurement. You can use a lookup table or a temperature compensation algorithm to correct the pressure reading based on the temperature output.
The recommended power supply voltage for the MPX4100AP is 5V ± 10%. However, the sensor can operate with a supply voltage as low as 4.5V and as high as 5.5V. Ensure that the power supply is clean and regulated to minimize noise and ensure accurate measurements.
