Accelerometer; Magnetometer - Nokia RM-609 Service Manual

RM-609
System Module

Accelerometer

Accelerometer is a geometric type component which can be configured either to generate an inertial wake-
up interrupt signal when a programmable acceleration threshold is exceeded along one of the three axes (x,
y, and z), or to detect a free-fall event. Each axe has its own sensor and those can measure positive and
negative directions.
The 3D accelerometer (N1102) Ahti_A sensor is connected to RAPU via two GENIOs ie Genio12 and Genio44
and I2C_0 bus. Power supply voltage is provided from VIO & VAUX2 output of EM ASIC.
It has the following features:
• 2.16V to 3.6V supply voltage
• 1.8V compatible IOs
• Low power consumption
• ±2g/±8g dynamically selectable scale
• I
2
C/SPI digital output interface
• Embedded self test
• 10000g high shock survivability
• Pb free/RoHS compliancy
Figure 56 Accelerometer interface

Magnetometer

3D magnetometer sensor (N1103) is connected to RAPU via two GENIOs ie Genio40 and Genio41 and I2C_0
bus. Power supply voltage is provided from VIO & VAUX1 output of EM ASIC. The magnetometer is used as a
city compass sensor. It detects the earth magnetic field density and composes bearing information for
navigation applications.
The magnetometer has the following features:
• 3-axis magnetometer device suitable for compass application
• Built-in A to D converter for magnetometer data out
• Self test function
• I2C bus interface
• Power modes: OFF mode, stand-by mode and active mode
• DRDY function for measurement data ready
• INT function to inform exceeding magnetic field strength threshold.
The operating temperature is -20°C to +85°C.
The operating supply voltages are:
• Analogue supply +2.4V to +3.6V
• Digital interface supply +1.70V to analogue supply voltage.
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