NXP MPX2200D: A Comprehensive Technical Overview of a Differential Pressure Sensor

The NXP MPX2200D stands as a significant component in the realm of analog pressure sensors, designed specifically for differential pressure measurement across a wide range of applications. This sensor integrates a monolithic silicon pressure sensing element and a thin-film metallization system on a custom silicon chip to provide a highly accurate, amplified analog output signal proportional to the applied pressure.

Operating Principle and Core Architecture

At its heart, the MPX2200D operates on the piezoresistive effect. The sensor contains a single, thermally silicon diaphragm etched from a silicon wafer. When a differential pressure is applied across the diaphragm (i.e., a higher pressure on one port than the other), the diaphragm deflects. This physical deflection causes a change in the resistance of the implanted piezoresistors arranged in a Wheatstone bridge configuration. The bridge's imbalance, caused by this resistance change, generates a small millivolt-level output signal. This signal is then passed through an on-chip, temperature-compensated amplifier, which conditions it into a robust, high-level analog voltage output, typically ranging from 0 to 40 mV for the full-scale pressure range.

Key Technical Specifications

Pressure Type: Differential (P1 > P2)

Pressure Range: 0 to 200 kPa (0 to 29 psi)

Supply Voltage: 10 VDC (typical), 16 VDC (maximum)

Output Signal: 0 to 40 mV (minimum, typical) at 10 VDC Vs, scaling linearly with supply voltage.

Accuracy: The sensor boasts excellent accuracy, characterized by a total error band of less than ±2.5% Full Scale Span (FSS) over a compensated temperature range of 0°C to 85°C. This includes nonlinearity, hysteresis, and non-repeatability.

Temperature Compensation: A critical feature is its on-chip laser-trimmed calibration and temperature compensation. This process ensures stable and reliable performance across the entire operating temperature range, minimizing offset and span drift.

Robust Packaging: It is housed in a durable plastic package (Case 867B-05) with a gel coating that protects the internal silicon die from harsh media, making it suitable for applications involving air and other non-corrosive gases.

Primary Applications

The combination of differential sensing, a wide pressure range, and high reliability makes the MPX2200D ideal for numerous fields:

Medical Equipment: Respiratory devices, ventilators, and CPAP machines for monitoring air flow and pressure.

Industrial Control: Pressure-based switching, leak detection, and flow metering in systems.

Automotive Systems: Monitoring air intake pressure, exhaust gas recirculation (EGR), and other under-hood pressures.

HVAC Systems: Filter monitoring and airflow control.

ICGOODFIND: The NXP MPX2200D is a robust and highly reliable differential pressure sensor that excels due to its integrated signal conditioning, excellent temperature stability, and proven durability. Its ability to provide a precise, amplified analog signal directly simplifies system design, making it a preferred choice for engineers developing critical measurement systems in medical, industrial, and automotive environments.

Keywords: Differential Pressure Sensor, Piezoresistive, Temperature Compensation, Analog Output, NXP MPX2200D