LSM6DSM Datasheet, PDF (37/113 Pages) STMicroelectronics – always-on 3D accelerometer and 3D gyroscope

LSM6DSM
Digital interfaces
6
Digital interfaces
6.1
I²C/SPI interface
The registers embedded inside the LSM6DSM may be accessed through both the I²C and
SPI serial interfaces. The latter may be SW configured to operate either in 3-wire or 4-wire
interface mode.
The serial interfaces are mapped onto the same pins. To select/exploit the I²C interface, the
CS line must be tied high (i.e connected to Vdd_IO).
Pin name
CS
SCL/SPC
SDA/SDI/SDO
SDO/SA0
Table 9. Serial interface pin description
Pin description
SPI enable
I²C/SPI mode selection (1: SPI idle mode / I²C communication enabled;
0: SPI communication mode / I²C disabled)
I²C Serial Clock (SCL)
SPI Serial Port Clock (SPC)
I²C Serial Data (SDA)
SPI Serial Data Input (SDI)
3-wire Interface Serial Data Output (SDO)
SPI Serial Data Output (SDO)
I²C less significant bit of the device address
6.2
Master I²C
If the LSM6DSM is configured in Mode2, a master I²C line is available. The master serial
interface is mapped in the following dedicated pins.
Pin name
MSCL
MSDA
MDRDY
Table 10. Master I²C pin details
Pin description
I²C serial clock master
I²C serial data master
I²C master external synchronization signal
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