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LSM6DSOX: 3 vs 4 wire SPI configuration

ANist
Associate III

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 ... ?

3 REPLIES 3
Uwe Bonnes
Principal III

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

ANist
Associate III

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

Uwe Bonnes
Principal III

"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.