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How to interpret data from Inertial Sensor

Question asked by Erat on Mar 15, 2012
Latest reply on Mar 15, 2012 by rdowning

Hello everyone, I am not sure if this is the correct section, so if it is not please let me know.

 

I am trying to read ADIS16407 using a PIC micro controller. The problem I am facing is the data I get does not make sense and does not change when I change the orientation of sensor. One thing I am expecting is that by default, the acceleration in the z-direction should be -1g but I am not getting anything around that number.

 

Also I don't exactly understand what the datasheet means when it says "Figure 11 provides an example of the four SPI signals when reading XGYRO_OUT in a repeating pattern." in the datasheet page 10

 

http://img193.imageshack.us/img193/5599/figure11.png

 

Can someone please clarify for me why the number 0xF9DA is divided by 4 after multiplying by 0.05, because as far as I can see there is only one SPI signal. Thanks in advance  

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