LSM303AH Datasheet, PDF (40/82 Pages) –

Application hints
LSM303AH
Pin#
1
2
3
4
5
6
7
8
9
10
11
12
Table 19. Pin status
Name
Function
Status
SCL
SPC
I²C serial clock (SCL)
SPI serial port clock (SPC)
Default: input without pull-up
SPI enable
I²C/SPI mode selection
CS
1: SPI idle mode / I²C communication enabled; ^{Default: input without pull-up}
0: SPI communication mode / I²C disabled
Reserved
SDA
SDI
SDO
Reserved, connected to GND
I²C serial data (SDA)
SPI serial data input (SDI)
3-wire interface serial data output (SDO)
Default: (SDA) input without pull-up
C1
Capacitor connection (C1 = 220 nF)
External cap, voltage forced by the
device
GND
0V
INT_MAG/DRDY Magnetometer interrupt/data-ready signal
Default: output high impedance
GND
0V
Vdd
Power supply
Vdd_IO
Power supply for I/O pins
INT2_XL
Accelerometer interrupt 2
Default: output forced to ground
INT1_XL
Accelerometer interrupt 1
Default: output forced to ground
Note:
In order to program INT_MAG/DRDY as a push-pull output, write the INT_MAG bit to 1 in
CFG_REG_C_M (62h).
5.1
Soldering information
The LGA package is compliant with the ECOPACK^®, RoHS and “Green” standards.
It is qualified for soldering heat resistance according to JEDEC J-STD-020.
Leave “Pin 1 Indicator” unconnected during soldering.
Land pattern and soldering recommendations are available at www.st.com.
5.2
High-current wiring effects
High current in wiring and printed circuit traces can be culprits in causing errors in magnetic
field measurements for compassing.
Conductor-generated magnetic fields will add to the Earth’s magnetic field, leading to errors
in compass heading computation.
Keep currents higher than 10 mA a few millimeters away from the sensor IC.
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