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How to implement the Freescale MPL115A digital barometer

Posted: 29 Apr 2009 ?? ?Print Version ?Bookmark and Share

Keywords:MPL115A barometer? barometer Freescale digital?

MPL115A is a simple barometer with digital output and high performance targeting low-cost commercial applications. The device employs a MEMS PRT pressure sensor with a conditioning IC to provide accurate pressure data. The sensor output is accurate to 1kPa over the 50kPa to 115kPa pressure range. An integrated ADC provides digitized temperature and pressure sensor outputs via an I?C or SPI bus. The part�s operating voltage is from 2.375V to 5.5V. The part is available as either an I?C or SPI part. The customer can order the device in either bus protocol depending on which is more convenient for their end application.

Calibration data is housed in on-board ROM. This data is used by a host MCU to apply a compensation algorithm to the raw ADC data from the pressure sensor and may be accessed at any time. The calibration data is stored as a series of coefficients that are applied to the raw data to compensate for temperature and pressure variation in the raw output.

This application note describes the SPI and I?C protocol needed to communicate to the digital pressure sensor. Following communication and extraction of the stored coefficients, raw data from the sensor�s PRT can be compensated on the host MCU for pressure and temperature. The application note details this process and the end result of the calculation is compensated pressure.

View the PDF document for more information.





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