ADXRS450 Digital Gyroscope : Needing help to generate 24V on CP5.


Hi,

I'm currently working on the ADXRS450 Gyroscope and I am concerned  about my hardware configuration. In regards to the boost converter, supplying 3.3V to the IC results in 12.5V on CP5, which I believe to be to low . Communicating to the IC believe works as the data I recieve back is a read/write error response. The result is true for supplying 5V aswell,  the voltage generated on CP5 is 20V which again is too low. The Diode and Inductor fit the specification mentioned in the data sheet. Are there any other factors that could affect/missed for this voltage step up?

Thanks,

Dyfan

 

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  • Hi Dyfan,

    Are you using a higher value inductor (560uH) for 3.3V operation as noted on page 10 of the datasheet?  Even at 5V supply the CP5 voltage is low and this may be due to leakage current.  The diode is the primary source of leakage current which has to be kept <70uA.

    Regards,

    Venkat

Reply
  • Hi Dyfan,

    Are you using a higher value inductor (560uH) for 3.3V operation as noted on page 10 of the datasheet?  Even at 5V supply the CP5 voltage is low and this may be due to leakage current.  The diode is the primary source of leakage current which has to be kept <70uA.

    Regards,

    Venkat

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