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 2.4V to +3.6V
•
Digital interface 1.70V to analogue supply voltage.
RM-609
System Module
Page 6 – 26
COMPANY CONFIDENTIAL
Issue 1
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