MMA8451Q
Sensors
10 Freescale Semiconductor, Inc.
3 Terminology
3.1 Sensitivity
The sensitivity is represented in counts/g. In 2g mode the sensitivity is 4096 counts/g. In 4g mode the sensitivity is 2048 counts/
g and in 8g mode the sensitivity is 1024 counts/g.
3.2 Zero-g Offset
Zero-g Offset (TyOff) describes the deviation of an actual output signal from the ideal output signal if the sensor is stationary. A
sensor stationary on a horizontal surface will measure 0g in X-axis and 0g in Y-axis whereas the Z-axis will measure 1g. The output
is ideally in the middle of the dynamic range of the sensor (content of OUT Registers 0x00, data expressed as 2's complement
number). A deviation from ideal value in this case is called Zero-g offset. Offset is to some extent a result of stress on the MEMS
sensor and therefore the offset can slightly change after mounting the sensor onto a printed circuit board or exposing it to
extensive mechanical stress.
3.3 Self-Test
Self-Test checks the transducer functionality without external mechanical stimulus. When Self-Test is activated, an electrostatic
actuation force is applied to the sensor, simulating a small acceleration. In this case, the sensor outputs will exhibit a change in
their DC levels which are related to the selected full scale through the device sensitivity. When Self-Test is activated, the device
output level is given by the algebraic sum of the signals produced by the acceleration acting on the sensor and by the electrostatic
test-force.
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