This part is a kind of semiconductor called MPX5700DP.

Function of this product has Integrated Silicon Pressure Sensor.

Manufacturers : Freescale Semiconductor

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Some of the text within the PDF file :

Freescale Semiconductor Integrated Silicon Pressure Sensor On-Chip Signal Conditioned, Temperature Compensated and Calibrated The MPX5700 series piezoresistive transducer is a state-of-the-art monolithic silicon pressure sensor designed for a wide range of applications, but particularly those employing a microcontroller or microprocessor with A/D inputs. This patented, single element transducer combines advanced micromachining techniques, thin-film metallization, and bipolar processing to provide an accurate, high level analog output signal that is proportional to the applied pressure. Features • 2.5% Maximum Error over 0° to 85°C • Ideally Suited for Microprocessor or Microcontroller-Based Systems • Available in Absolute, Differential and Gauge Configurations • Patented Silicon [ ... ]

MPX5700DP PDF Datasheet Download