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SShan.11
Visitor II
April 9, 2019
Solved

Self test on the LIS2DE12TR

  • April 9, 2019
  • 12 replies
  • 4967 views

Hello,

I am working on a project where I have to interface the LIS2DE12TR Accelerometer via I2C interface with TI cc2652 chip. As a start I wanted to verify the hardware functionality. In the datasheet it is mentioned of a Self-Test Mode of operation. I did not understand how the operation can be verified in the self-test. Should we just enter into self test mode and then monitor the x,y,z output values and check if they are within the specified range ? Also is there any example for this self test procedure that has been done.

Also in the datasheet there is mentioned a Slave Ack and a Master ACK. How do we know that the slave Ack has been received and how do we send a Master Ack/Nack

Regards,

SS

    This topic has been closed for replies.
    Best answer by kamion

    Hi @christian239955_stm1_st​, @Eleon BORLINI​,

    I figured it out.

    For the LIS2DE12, the BDU bit in CTRL_REG4 must be set to 0.

    The description of the BDU bit states:

    Block data update. Default value: 0
(0: continuous update; 1: output registers not updated until MSB and LSB have been read)

    Since the LIS2DE12 do not have OUT_X_L, OUT_Y_L and OUT_Z_L registers, turning BDU on will prevent the output registers from being updated.

    Cheers,

    Kamion

    12 replies

    Show previous replies
    C
    christian239955_stm1_st
    Visitor II
    April 30, 2020

    Dear Eleon

    Another Question regarding the Configuration in the PNG above.

    It states that the CTRL_REG1 should be configured with the Value 0x47. The datasheet states:

    LPen This bit must be set to '1' for the correct operation of the device. Default value: 0

    Probably there should be a 0x4F in CTRL_REG1 instead, right?

    Kind regards

    Christian

    K
    kamion
    Visitor II
    September 21, 2020

    Hi @Eleon BORLINI​,

    Can we get your comment on the LPen bit in CTRL_REG1?

    Cheers,

    Kamion 

    K
    kamion
    Visitor II
    September 21, 2020

    The correct answer to this is, for the LIS2DE12, the LPen bit must be 1, in order to have the correct behaviour for 8-bit output. This device only supports 8-bit output.

    E
    Eleon BORLINI
    ST Employee
    September 22, 2020

    Hi @kamion​ ,

    sorry for the late feedback and thank you very much for your follow up and the resolved cases.

    About the dataout, yest, it is on 8 bits.

    -Eleon

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