LSM6DS3US datasheet(30/104 Pages) STMICROELECTRONICS

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Functionality

LSM6DS3US

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DocID028476 Rev 4

5.4

Interface flexibility with auxiliary SPI

In Mode3 configuration of the LSM6DS3US, interface flexibility is supported as follows:



Primary interface: I2C or SPI (3/4-wire)



Auxiliary interface: SPI (3-wire)

This configuration can support OIS applications, see details in the following figure.

Figure 5. Mode 3 interface configuration (OIS applications)

The primary interface is always available and the gyroscope output values are in registers

22h to 27h as per user-selected FS and ODR.

The auxiliary interface needs to be enabled in CTRL_SPIAux (70h) register and gyroscope

output values are in registers 22h to 27h with FS = 250 dps and ODR = 3.3 kHz. In this

interface SPI can write only to the dedicated register (CTRL_SPIAux (70h)). When the

auxiliary SPI is connected to the camera module, the recommendations are as follows:



Single axis enable bits in CTRL9_XL (18h) and CTRL10_C (19h) have to be ‘1’ (default

value)



Sign and orient bits in ORIENT_CFG_G (0Bh) have to be set to ‘0’ (default value)



Sleep bit in CTRL4_C (13h) has to be set to ‘0’ (default value)



Avoid using the self-test if the camera module is reading data

When the camera module is not connected, the device has the same behavior as the

LSM6DS3 (all bits supported).

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