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3.6
3.6.1
Overload Response
Overload Performance
The device is designed to operate within a specified range. Acceleration beyond that range (overload) impacts the output of
the sensor. Acceleration beyond the range of the device can generate a DC shift at the output of the device that is dependent
upon the overload frequency and amplitude. The g-cell is overdamped, providing the optimal design for overload performance.
However, the performance of the device during an overload condition is affected by many other parameters, including:
? g-cell damping
? Non-linearity
? Clipping limits
? Symmetry
Figure 24 shows the g-cell, ADC and output clipping of The device over frequency. The relevant parameters are specified in
Section 2 .
Acceleration (g)
g-cell Rolloff
R eg
R eg
g-ce
d by
Clip
due
rtion inearit
al D d Non-
e d by isto L
Sign y an
egio symm
A
g g-cell_Clip
g ADC_Clip
Region Clipped
by Output
LPF Rolloff
ion
i on
pe
C lipp
R
n of e tr
ll
A DC
to
y
Determined by g-cell
roll-off and ADC clipping
Determined by g-cell
roll-off and full-scale range
g Range_Norm
Region of Interest
Region of No Signal Distortion Beyond
Specification
f LPF
f g-Cell
5kHz
10kHz
Frequency (kHz)
Figure 24. Output Clipping vs. Frequency
3.6.2
Sigma Delta Modulator Over Range Response
Over Range conditions exist when the signal level is beyond the full-scale range of the device but within the computational
limits of the DSP. The ΣΔ converter can saturate at levels above those specified in Section 2 (G ADC_CLIP ). The DSP operates
predictably under all cases of over range, although the signal may include residual high frequency components for some time
after returning to the normal range of operation due to non-linear effects of the sensor.
MMA52xxKW
Sensors
32
Freescale Semiconductor, Inc.
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