BMI270 undocumented register 7B

[aloiseau]

Trying to dig into a BMI270 gyro issue, I am facing an undocumented register at offset 7B. Does anyone know what this register is about (especially its bit 0)?

Note: maybe-related issue I am working on is a gyro noise handled by its dedicated thread. If of interest, this thread contains full register dump involved.

[BSTRobin]

Hi aloiseau,

Thanks for your inquiry.
As described in the BMI270 data sheet, the 0x7B register is reserved and not publicly disclosed.
Have you encountered any problems during the use of BMI270?

[aloiseau]

Hi,

I did not cross issues using BMI270 basically, but I am facing gyro noise on a subset of products embedding BMI270. I created a dedicated thread for the issue (here is the link). Trying to dig into differences between noisy pieces and not noisy pieces I saw register 7B value difference, therefore I was interested to know if this undocumented bit difference was providing hidden details like an error code or a different execution mode.

It worth to be noted that factory sent me few noisy product for analysis but despite the vast majority of product being not noisy I have no that many non-noisy products around therefore I only compared a not noisy product with a noisy one for now. I can't say if register 7B value follows the noise. I can only say its bit 0 has been seen as 1 on a not noisy product and as 0 on a noisy product.