mma1605nwr2 Freescale Semiconductor, Inc, mma1605nwr2 Datasheet - Page 28

• Manufacturer Part Number: mma1605nwr2
• Description: Dsi Inertial Sensor
• Manufacturer: Freescale Semiconductor, Inc

28
3.7
3.7.1
operating range 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 device 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:
ified in
3.7.2
of the DSP. The ΣΔ converter can saturate at levels above those specified in
ably under all cases of overrange, although the signal may include residual high frequency components for some time after re-
turning to the normal range of operation due to non-linear effects of the sensor.
MMA16xxNW
g
Acceleration (g)
Range_Norm
g
The device is designed to operate within a specified range. however, acceleration beyond that range (overload) impacts the
Figure 21
Overrange conditions exist when the signal level is beyond the full-scale range of the device but within the computational limits
g
g-cell_Clip
ADC_Clip
Section
Overload Response
Overload Performance
Sigma Delta Overrange Response
• g-cell damping
• Non-linearity
• Clipping limits
• Symmetry
shows the g-cell, Sigma Delta, and output clipping of the device over frequency. The relevant parameters are spec-
Region of Interest
2.
Region Clipped
by Output
f
LPF
LPF
Figure 21. Output Clipping Vs. Frequency
Rolloff
f
g-Cell
Region of No Signal Distortion Beyond
Specification
g-cell
Rolloff
Section 2
(G
5kHz
ADC_CLIP
). The DSP operates predict-
10kHz
Freescale Semiconductor
Determined by g-cell
roll-off and ADC clipping
Determined by g-cell
roll-off and full scale range
Frequency (kHz)
Sensors