LSM6DS3US datasheet(30/104 Pages) STMICROELECTRONICS

30 / 104 page

Functionality

LSM6DS3US

30/104

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).

LSM6DS3US Datasheet(PDF) 30 Page - STMicroelectronics