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tom_wolcott
Visitor II
January 10, 2014
Question

Start-up state of L3GD20 and SPI bus

  • January 10, 2014
  • 1 reply
  • 772 views
Posted on January 10, 2014 at 20:15

On power-up, does this gyroscope come up in operating, sleep, or power-down mode (i.e., when all SPI peripherals in my instrument are powered up by a common bus, how much is the gyro drawing?

The datasheet says that Vdd may be disconnected (powering off measurement functions) but if Vdd-IO is maintained the (SPI) bus ''is not blocked.''  I assume this means that SDO and SDI are not pulled low by the powered-down gyro.  What is current drain from Vdd-IO when Vdd is off?

I plan to use this gyro to measure slow (even < 1dps) rotation of an oceanographic drifter.  Can you reassure a mere biologist that this is an appropriate device?

Thanks!

Tom Wolcott

Professor Emeritus

#gyroscopes
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    1 reply

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    Thiago REIS
    Visitor II
    February 5, 2014
    Posted on February 05, 2014 at 14:20

    Hello Thomas,

    The L3GD20 is the appropriate device for your project, it has a sensitivity of 8.75 mdps/digit, this means that you will be able to safely monitor 1 degree variations.

    On the current consumption part of your question, I still need to verify the current consumption for that aspect.

    Thank you,

    Thiago REIS

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