MMA8491Q
Sensors
8 Freescale Semiconductor, Inc.
2.2 Mechanical characteristics
Mechanical characteristics are at V
DD
= 2.8V, T
A
= +25°C, unless otherwise noted
(8) (10)
.
1. Parameters tested 100% at final test at room temperature.
2. Verified by characterization; not tested in production.
3. Before board mount.
4. Post-board mount offset specifications are based on a 4-layer PCB, relative to 25°C.
5. All angles are based on the trip angle from static 0g to 1g; the g-values are calculated from the trip angle.
6. Evaluation data: not tested in production.
7. Guaranteed by design.
8. Typical number is the target number, unless otherwise specified.
9. Typical number is mean data.
10.All numbers are based on V
DD
cap = 4.7 μF.
Table 4. Mechanical characteristics
Parameter Symbol Conditions Min Typ Max Unit
Full-scale measurement range
(2)
FS ±8 g
Sensitivity
(1)
So 973 1024 1075 counts/g
Calibrated sensitivity error
(1)
CSE All axes, all ranges -5 5 %
Cross-axis sensitivity
(2)
CX
SEN
Die rotation included -4.2 4.2 %
Sensitivity temperature variation
(2)
TCS -40°C to +85°C -0.014 0.014 %/°C
Zero-g level temperature variation
(2)
TCO -40°C to +85°C -0.98 0.98 mg/°C
Zero-g level offset accuracy
(1) (3)
TyOff -100 100 mg
Zero-g level after board mount
(2) (4)
TyOffPBM -120 120 mg
Noise
(2)
RMS 11.5
(9)
18 mg-rms
Nonlinearity
(2)
NL 1%FS
Threshold / g-value
(5)
TDL
Internal threshold of output level
change (from 0g reference) , g
values are calculated from trip
angles
25°C 0.583 0.688 0.780
g
-40°C to +85°C 0.577 0.688 0.784
Threshold / Tilt angle
(2) (4) (5)
TDL
Internal threshold of output level
change (from 0g reference)
25°C 35.6 43.5 51.3
degrees
-40°C to +85°C 35.2 43.5 51.7
Temperature range
(2)
T
AGOC
-40 25 85 °C
