Magnetometer - Nokia RM-701 Service Manual

RM-701
System Module
Figure 73 Accelerometer

Magnetometer

The 3D magnetometer (N1105) is connected to RAPU via two GENIOs (DRDY=Genio40, INT=Genio41) and I2C_0
bus. Supply voltages are VIO (1.8 V) and VAUX1 (2.8 V).
The magnetometer is most commonly used for pedestrian navigation when the map north is aligned with
the magnetic north. Some gaming, compass and other applications that utilize the magnetometer are also
available.
Before using the magnetometer on an application, static magnetic fields caused e.g. by speakers, vibras or
magnetized ferromagnetic metals within the phone need to be removed from the 3D data. The calibration
is done by rotating the phone for a few seconds around its all axes. In the Maps application, the status of the
magnetometer calibration is indicated by the compass color.
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