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JHeer.1
Visitor II
July 22, 2021
Question

When can I write to INT1_CFG in the LIS3DH?

  • July 22, 2021
  • 1 reply
  • 1151 views

I am using the LIS3DH MEMS motion sensor. To generate interrupts when motion exceeds a threshold, I need to set certain flags in the INT1_CFG register (address 0x30). The manual says: Write operation at this address is possible only after system boot.

What exactly does this mean? Does it mean I can only write to this address once per time I power on the LIS3DH? Does it mean I have a window of time to write to INT1_CFG after it powers on? If I want to write to it multiple times eg. to change interrupt configuration, do I need to fully power cycle the device?

Thanks.

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    1 reply

    T
    TBomb.1
    Visitor II
    July 22, 2021

    Hi, in the LIS3DH datasheet (https://www.st.com/resource/en/datasheet/lis3dh.pdf) p.32 there is: "The boot procedure is complete about 5 milliseconds after device power-up". So you should wait 5ms only once after the start up of the device, before I2C/SPI, but no need to reboot the device every time you want to change register configurations.

    You can also decide to read/write multiple registers using the MS bit at ‘1’.

    Tom

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