GZP6858A: Amplified Pressure Sensor, Absolute Pressure Type

Product Description

The GZP6858A pressure sensor is a compact MEMS pressure sensor designed particularly for a wide applications with various pressure range. It is composed of a silicon piezoresistive pressure sensing chip and a signal conditioning integrated circuit. The initial signal from the sensing chip is amplified, temperature compensated, calibrated and finally converted to a high level analog output voltage that is proportional to the applied pressure.

Function Description

This product is made with advanced micro-electromechanical principles . The core technology is a MEMS pressure sensor chip based on the silicon piezoresistive effect and a high-performance signal conditioning AISC chip. The silicon micro-piezoresistive MEMS pressure sensor chip outputs a voltage signal proportional to the measured pressure through a Wheatstone bridge composed of four strain-sensitive resistors. The signal is amplified, temperature compensated and linearized by the ASIC chip to obtain an output voltage that is in a prescribed relationship with the applied pressure. The linearity and temperature compensation of the transfer function are realized by the digital processing circuit in the ASIC. Through the polynomial compensation algorithm and multi-point pressure calibration technology at multiple temperatures, high-precision pressure measurement is achieved within the full operating temperature range.

The transfer function of the pressure sensor is created by the following parameters:

• Minimum and maximum pressure ratings
• Voltage values at minimum and maximum rated pressure
• Clamping voltage

All parameters required for a complete calibration algorithm, such as offset, gain, temperature
coefficients of offset and gain, and linearity parameters, are determined after calibration and stored in the
E²PROM inside the ASIC.