LIS2DS12 tilt functionality

[VOsip.1]

Hello there.

I'm trying out the LIS2DS12 accelerometer. The datasheet mentions that the sensor is supposed to be able to detect a tilt, however I didn't manager to get an interrupt for such event. The datasheet doesn't give an explanation on how to use tilt detection at all, it only mentions it.

My proceedings after initialization:

Set FIFO control to 0x60 (Continious to Fifo mode)

SET CTRL5 to 0x10 (INT2 pad to tilt interrupt)

Set FUNC_CTRL to 0x20 (MODULE ON)

Set Func_CTRL to 0x20+0x10 (MODULE ON and TILT_ON) (here btw someone was lazy, cause the description of this bit is copied from description of previous register)

After this I expect that the Interrupt pad 2 will go high after I tilt the sensor, that doesn't happen however. Also the datasheet doesn't say, how much tilt it will react to? Like 1 degree, or 90 degree or when?

I didn't find any code example on the net except for initializing and reading in bypass mode (on github eclipse/upm), so I'm at lost here.

[TBomb.1]

Hi, in the application note for sensor LIS2DS12 this procedure is reported:

1. Write 20h in CTRL1 // Turn on the accelerometer // ODR = 25 Hz, FS = ±2 g

2. Write 10h in FUNC_CTRL // Enable tilt detection

3. Write 10h in CTRL5 // Tilt detector interrupt driven to INT2 pin

https://www.st.com/resource/en/application_note/dm00218428-lis2ds12-alwayson-3d-accelerometer-stmicroelectronics.pdf

You have to turn on the accelerometer first. Are you using the FIFO for a specific reason?

Tom