I have a project that use both LIS2DH12 and IIS2DH. How can I discriminate them in code?

DVu.4 · ‎2022-01-03

Eleon BORLINI · ‎2022-01-04

Hi @DVu.4 ,

Since the WHO_AM_I register content is the same for both devices, in order to discriminate them in code I suggest you to poll -for example- the CTRL_REG0 (1Eh) register. It exists and is 00010000bin for the LIS2DH12, while it doesn't exist for the IIS2DH. See LIS2DH12 datasheet, p.33.

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-Eleon

DVu.4 · ‎2022-01-04

Dear @Eleon BORLINI ,

I tried this way. Although Register 1Eh is "Reserved" for the IIS2DH It has a default value is 00010000bin too.

-DVu

Eleon BORLINI · ‎2022-01-12

Hi @DVu.4 ,

ok, that was unexpected. It had changed in time. You might then try reading the FIFO_SRC_REG (2Fh), that should be 0010000b for the IIS2DH, and 0000000b for the LIS2DH12.

Otherwise, the only way to distinguish between them is from the top package marking.

-Eleon