Why am I getting zero acceleration values from LSM6DS3 Eval Board (STEVAL-MKI160V1) ?

[AK A.1]

I am using LSM6DS3 Evaluation Board to get the acceleration and angular velocity data through I2C. I have powered up both Accel and Gyro by writing to the respective control registers and disabled the FIFO. But, when I read the data from Data Out registers (0x28 - 0x2D) of Accelerometer, I am getting zeros along all the 3 axes in all the orientations.

Any ideas on what might be wrong ?

Thank you.

[Eleon BORLINI]

Hi @AK A.1​ , do you get zeros also along gyroscope axis (data registers 0x22 - 0x27)? If only the acceleration data are wrong, please check if you well configured the LSM6DS3 device at the beginning of your code, as shown in the AN4650 p 36:

Write CTRL9_XL = 38h // Acc X, Y, Z axes enabled
Write CTRL1_XL = 60h // Acc = 416Hz (High-Performance mode)
Write CTRL10_C = 38h // Gyro X, Y, Z axes enabled
Write CTRL2_G = 60h // Gyro = 416Hz (High-Performance mode)

Regards

[AK A.1]

Hi Eleon,

Thank you for the suggestion.

I was setting HP_SLOPE_XL_EN bit in CTRL8_XL register which was enabling the High Pass Filter. This was filtering out the DC Acceleration values. So, I was getting zero Acceleration values. The problem is resolved now.

Akshay

[DDale.1]

Hi,

About AIS2120SX chip, can you tell me how to initialize it?

That is, the acceleration from being charged up to being able to read the X and Y axes.

What is the entire SPI operation?

It's very difficult to use this chip.

I tried to initialize the chip, but failed.

Thanks for any help you can provide!

[Eleon BORLINI]

Hi @DDale.1​ , I first would suggest you to read carefully the datasheet,

Then you may be right the chip is not as plug-and-play as almost every other ST sensor, since it is SPI over 32 bit and with polynomial CRC to check the data consistency. I may share you the screen of a labview code for the initialization of a similar chip.

Regards