Asm330Lhh DEVICE_CONF

[wz2]

Hello, I have encountered some issues while developing with the  ASM330LHH.

During the initialization sequence of the ASM330LHH interface, I first read the WHO_AM_I  register. After confirming that the value is correct, I proceed to access other registers. In my tests, the WHO_AM_I value read back was correct.

After checking the datasheet, it mentions that DEVICE_CONF set 1 to enable configuration. Now, after reading WHO_AM_I and before accessing other registers, I set DEVICE_CONF to 1. When I test again, the value read back from WHO_AM_I becomes incorrect.

Could you explain why this happens?I am using SPI for communication in both cases, and the SPI configuration has not be changed at all — I only added the DEVICE_CONF operation.

[MHoll.2]

I don't use SPI, bit for SPI it seems that You have to set I2C_disable = 1, before setting DEVICE_CONF.

[Federica Bossi]

Hi @wz2 ,

I suggest you follow these steps:

1. After reset or power‑up, read WHO_AM_I with DEVICE_CONF = 0 to check device identity.
2. Set DEVICE_CONF = 1.
3. Configure all required registers (ODR, FS, filters, FSM/MLC, etc.).
4. Clear DEVICE_CONF back to 0 to exit configuration mode and start normal operation.
5. From this point on, do not use DEVICE_CONF = 1 unless you need to reconfigure the device.