Start-up state of L3GD20 and SPI bus

tom_wolcott · ‎2014-01-10

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

Thiago REIS · ‎2014-02-05

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