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Data manipulation and basic settings of the MMA8450Q with driver code

Posted: 08 Mar 2010 ?? ?Print Version ?Bookmark and Share

Keywords:acceleration data? basic settings MMA8450Q? data manipulation?

It is important to understand how to program the MMA8450Q to extract and manipulate the acceleration data. The MMA8450Q has many different features, which include seven different sample rates, 28 different cut-off frequencies for the high pass filter, three different dynamic ranges with different sensitivities for 12bit output data, 8bit output data and 8bit delta data (data that has been filtered through the high pass filter).

It also has a 32 sample FIFO for collecting and storing data, which is the most efficient way to access the data for minimizing the I?C transactions. The manipulation of the data into different formats is important for algorithm development and for display. This application note accompanies the MMA8450Q_Driver Code and explains the following:

? Changing the different modes (Shutdown, Standby, 2g, 4g and 8g);
? Changing the data rate;
? Changing the high pass filter cut off frequency;
? 8bit data vs. 12bit data;
? Changing data formats (hex to counts to decimal numbers);
? Streaming XYZ data polling vs. streaming XYZ data with interrupts.

View the PDF document for more information.

Click here to view related datasheets.

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