LSM303DLHC Datasheet, PDF (16/43 Pages) STMicroelectronics – Ultra compact high performance e-compass 3D accelerometer and 3D magnetometer module

Application hints
4
Application hints
LSM303DLHC
4.1
Figure 4. LSM303DLHC electrical connection
Z
Vdd_IO
Y
1
X
13
6
8
TOP VIEW
Z
1
Y
6
8
X
13
C1=4.7uF
6
1
TOP VIEW
8
13
C2=0.22uF
Vdd
Vdd I2C bus
C3 = 10uF
C4 = 100nF
Rpu Rpu
10kOhm 10kOhm
TOP VIEW
GND
Digital signal from/to signal controller.Signals levels are defined by proper selection of Vdd
AM09239V1
capacitors
The C1 and C2 external capacitors should be low SR value ceramic type constructions (typ.
suggested value 200 mOhm). Reservoir capacitor C1 is nominally 4.7 µF in capacitance,
with the set/reset capacitor C2 nominally 0.22 µF in capacitance.
The device core is supplied through the Vdd line. Power supply decoupling capacitors
(C4=100 nF ceramic, C3=10 µF Al) should be placed as near as possible to the supply pin
of the device (common design practice). All the voltage and ground supplies must be
present at the same time to have proper behavior of the IC (refer to Figure 4).
The functionality of the device and the measured acceleration/magnetic field data is
selectable and accessible through the I²C interface.
The functions, the threshold, and the timing of the two interrupt pins (INT 1 and INT 2) can
be completely programmed by the user through the I²C interface.
4.2
Pull-up resistors
Pull-up resistors (suggested value 10 kOhm) are placed on the two I²C bus lines.
16/42
Doc ID 018771 Rev 1