参数资料
型号: MMA6823AKW
厂商: Freescale Semiconductor
文件页数: 43/54页
文件大小: 0K
描述: IC ACCELEROMETER XY AXIS 16QFN
标准包装: 75
轴: X,Y
加速范围: ±120g,±60g
灵敏度: 4.1 LSB/g,8.2 LSB/g
电源电压: 3.135 V ~ 5.25 V
输出类型: SPI
带宽: 400Hz
接口: SPI
安装类型: 表面贴装
封装/外壳: 16-QFN 裸露焊盘
供应商设备封装: 16-QFN-EP(6x6)
3.11
Overload Response
3.11.1 Overload Performance
MMA68xx 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 MMA68xx g-cell is overdamped, providing the optimal design for overload perfor-
mance. 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 32 shows the g-cell, ADC and output clipping of MMA68xx over frequency. The relevant parameters are specified in
Section 2.1 , and Section 2.6 .
Acceleration (g)
g-cell Rolloff
Reg
R eg
g-ce
d by
Clip
n du
e to
yA
ortio -Linear
ed b ist
al D d Non
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 etr
ll
DC ity
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 32. 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.
MMA68xx
Sensors
Freescale Semiconductor, Inc.
43
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