LIS331DL SPI communication issue

[TommyMao]

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]

Hi ST,

  Could you support this topic?

[Federica Bossi]

Hi @TommyMao ,

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