LIS331DL SPI communication issue

TommyMao · ‎2023-10-11

Hi guys,

I met a SPI communication issue about LIS331DL. The type of kit board is MKI153. When I tied VDDIO and VDD to 3.3V, the data from chip register by SPI isn't correct. When I only connect VDD to 3.3v, The data is correct.

The register is WHO_AM_I and CTRL_REG1.

Tie vddio and vdd together: WHO_AM_I register value = 0x20 CTRL_REG1 = 0x06

In this case: vddio & vdd = 3.3v

Only connect VDD: WHO_AM_I register value = 0x32 CTRL_REG1 = 0x07

In this case: vdd = 3.3v. vddio is around 2.5v (vddio pin is floating)

Pls see attached pictures. I can't understand this issue. Could you check it?

Thanks!

TommyMao · ‎2023-10-12

Hi ST,

Could you support this topic?

Federica Bossi · ‎2023-10-12

Hi @TommyMao ,

Have you already looked at our PID on Github to check if your writings are correct?

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