NXP MPX5700GP: A Comprehensive Overview of the Integrated Pressure Sensor

The NXP MPX5700GP stands as a significant component in the realm of integrated pressure sensors, designed to deliver reliable and precise measurements for a wide array of applications. This device exemplifies the integration of advanced micromachining technology with on-chip signal conditioning, providing a complete, calibrated analog output proportional to the applied pressure.

Constructed with a monolithic silicon piezoresistive sensor, the MPX5700GP is engineered for high accuracy and stability. The core sensing element is fabricated using a sophisticated micromachining process, which etches a thin diaphragm into the silicon. Piezoresistors are strategically placed on this diaphragm; when pressure is applied, the diaphragm deflects, causing a change in the resistor values. This change creates a differential voltage output that is the fundamental pressure signal.

A key differentiator for this sensor is its on-chip integrated signal conditioning circuitry. This includes an advanced amplifier network and a dedicated temperature compensation unit. The raw signal from the piezoresistive network is inherently small and susceptible to variations, particularly from temperature drift. The integrated circuitry amplifies the weak signal to a robust 0.2 to 4.7V output range and, crucially, actively compensates for offset and span variations over the entire specified temperature range of -40°C to +125°C. This eliminates the need for external calibration or additional components, simplifying design-in and enhancing long-term reliability.

The MPX5700GP is specifically designed to measure absolute air pressure from 0 to 700 kPa (0 to 100 psi), making it exceptionally suitable for applications requiring a reference to a vacuum. Its robust design includes a gel-filled compartment and a durable plastic package (PPS) that protects the sensitive silicon die from harsh media, such as humid or corrosive air, which is common in automotive and industrial environments.

Primary applications are predominantly found in the automotive and industrial sectors. It is ideal for:

Engine Control Systems: Monitoring manifold absolute pressure (MAP) for optimal air-fuel mixture calculation.

Medical Equipment: Used in ventilators and respiratory therapy devices for pressure monitoring.

Industrial Automation: Employed in hydraulic and pneumatic systems, pump control, and pressure switch applications.

Altitude Measurement: Functioning as a barometric pressure sensor for altitude determination.

ICGOODFIND: The NXP MPX5700GP is a highly integrated, temperature-compensated pressure sensor that offers designers a simplified, reliable, and cost-effective solution for precise absolute pressure measurement. Its combination of a robust sensing element, comprehensive on-chip signal conditioning, and media resistance makes it a versatile and dependable choice for demanding automotive, medical, and industrial applications.

Keywords: Integrated Pressure Sensor, Absolute Pressure, On-Chip Signal Conditioning, Temperature Compensation, Manifold Absolute Pressure (MAP)