AnsweredAssumed Answered

A3G4250D starting problems

Question asked by karsteng on Nov 22, 2013
Latest reply on Feb 10, 2014 by urs.kantha_raj
Hi everybody,

I am trying my first steps with the A3G4250D MEMS Gyroscope. Unfortunately, I did not manage to get useful measurement information yet. 

What I want to do is the following:
       
  • sample the angular rate with a ODR of 100 Hz 
  •    
  • read out the data from the FIFO every 250 ms 
  •    
  • read out the temperature register to implement temperature correction later
This is how I set the configuration registers:
       
  • CTRL_REG1: 0x0F
  •    
  • CTRL_REG2: 0x00
  •    
  • CTRL_REG3: 0x00
  •    
  • CTRL_REG4: 0x00
  •    
  • CTRL_REG5: 0x40
  •    
  • FIFO_CTRL_REG: 0x39
I have the following questions:
       
  1. Is there any conversion formula provided for the data in the OUT_TEMP register? 
  2.    
  3. Is my configuration correct to read out the measurements (ODR of 100 Hz) from the FIFO every 250 ms? I would expect the FIFO_SRC_REG to set the watermark bit after 250 ms, but the register remains at 0x20 which means the FIFO is empty.
Any hints or comments are very appreciated!

Regards, 
Karsten

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