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3.11
3.11.1
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 34 shows the g-cell, ADC and output clipping of the device over frequency. The relevant parameters are specified in
Section 2.1 , and Section 2.6 .
Acceleration (g)
g-cell Rolloff
g-ce
ped
Clip
Reg
due rity
d by
stor n-Line
l Di
lipp
o
of S etry an
egio
gion ymm
Re
g g-cell_Clip
g ADC_Clip
Region Clipped
by Output
LPF Rolloff
R
ion
by
e
As
ll
ADC tion a
nC igna dN
to
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 34. Output Clipping vs. Frequency
3.11.2
Sigma Delta 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 2.1 (G ADC_CLIP ). The DSP operates pre-
dictably 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.
MMA655x
Sensor
42
Freescale Semiconductor, Inc.
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