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ANist
ANist
Associate III
July 17, 2019
Question

LSM6DSOX: 3 vs 4 wire SPI configuration

  • July 17, 2019
  • 3 replies
  • 1280 views

Hello, this should be a basic question but I am pretty new in this field. What are the core difference between a 3 and a 4 wir SPIe configuration for LSM6DSOX? Apart from electrical connection, is there any difference in Firmware design, capabilities etc ... ?

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    3 replies

    Uwe Bonnes
    Uwe Bonnes
    Chief
    July 17, 2019

    The 4th wire is chip select. De-asserting CS is a good way to abort a run-stray communication.

    ANist
    ANistAuthor
    Associate III
    July 17, 2019

    @Uwe Bonnes​  What do you mean by "aborting a run-stray communication" ?

    Uwe Bonnes
    Uwe Bonnes
    Chief
    July 19, 2019

    "Run astray communication" in the sense that things do not happen as you expect it. With CS going high and the low again, the device starts from a known state in the SPI communication, like an SPI communication reset.

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