LSM303DLHCTR Datasheet, PDF (18/42 Pages) STMicroelectronics – Ultra compact high performance e-compass 3D accelerometer and 3D magnetometer module

Digital interfaces
5
Digital interfaces
LSM303DLHC
The registers embedded inside the LSM303DLHC are accessible through two separate I²C
serial interfaces, one for the accelerometer core and one for the magnetometer core.
Table 9. Serial interface pin description
PIN Name
PIN Description
SCL
SDA
I²C serial clock (SCL)
I²C serial data (SDA)
5.1
I²C serial interface
The LSM303DLHC I²C is a bus slave. The I²C is employed to write the data into the
registers whon 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
The device which receives data from the bus
Master
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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