LSM303DLH Datasheet, PDF (23/47 Pages) STMicroelectronics – Sensor module: 3-axis accelerometer and 3-axis magnetometer

LSM303DLH
7
Digital interfaces
Digital interfaces
The registers embedded inside the LSM303DLH are accessible through two separate I²C
serial interfaces: one for the accelerometer core and the other for the magnetometer core.
The two interfaces can be connected together on the PCB.
Table 9. Serial interface pin description
Pin name
Pin description
SCL_A
SDA_A
SCL_M
SDA_M
I²C serial clock (SCL) for accelerometer
I²C serial data (SDA) for accelerometer
I²C serial clock (SCL) for magnetometer
I²C serial data (SDA) for magnetometer
7.1
I²C serial interface
The LSM303DLH I²C is a bus slave. The I²C is employed to write the data into the registers
whose content can also be read back.
The relevant I²C terminology is given in the table below.
Table 10. Serial interface pin description
Term
Description
Transmitter
The device which sends data to the bus
Receiver
Master
The device which receives data from the bus
The device which initiates a transfer, generates clock signals and terminates a
transfer
Slave
The device addressed by the master
There are two signals associated with the I²C bus: the serial clock line (SCL) and the serial
data line (SDA). The latter is a bidirectional line used for sending and receiving the data
to/from the interface.
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