BMI085 vs BMI088

[TKMS]

Dear community,

I learned from the forum here that there are some differences between the BMI085 and BMI088.

Please clarify the following. Thank you!

1) What does the higher vibration robustness and suppression of the BMI088 mean?
Does it affect the accelerometer or the gyroscope?

2) The BMI088 is trimmed for higher g-values. Does it influence the accuracy or offset at 1g gravity in comparison to the BMI085?

3) The BMI085 does have a synchronization feature of the acc-data and the gyro-data. Does it exists on the BMI088 as well?

[handytech]

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@TKMS wrote:

1) What does the higher vibration robustness and suppression of the BMI088 mean?
Does it affect the accelerometer or the gyroscope?

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Higher vibration robustness is achieved in the accelerometer thanks to a unique hardware design to dampen/suppress high-frequency vibrations (i.e. "mechanical low-pass filter").

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@TKMS wrote:

2) The BMI088 is trimmed for higher g-values. Does it influence the accuracy or offset at 1g gravity in comparison to the BMI085?

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Not really, but I would recommend to compare the relevant specifications available in each datasheet for your specific requirements.

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@TKMS wrote:

3) The BMI085 does have a synchronization feature of the acc-data and the gyro-data. Does it exists on the BMI088 as well?

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Yes, the data synchronization is supported for both BMI085 and BMI088 when using the official sensor API on our GitHub page.

[TKMS]

Thanks for the response!

Regarding the "mechanical lowpass filter": Can I achieve the same suppression capability with the BMI085 by simply setting it to a lower bandwidth and sampling rate, e.g. 200Hz? The vibration suppression of the BMI088 is in the higher frequency range (several hundred Hz), therefore, I would expect such frequencies to be suppressed by the BMI085 as well if it runs at a low bandwidth. Is this correct?

[handytech · Accepted solution]

It is always possible to enable digital filters (either from the sensor itself, or by processing data in your host), but a side-effect we be for instance a reduced output data-rate. Therefore the BMI088 could potentilly reduce the need for digital filters and/or offer higher ODR while still damping vibrations, whichever is best for your specific needs.