SCA3100 DEMO KIT VTI Technologies, SCA3100 DEMO KIT Datasheet - Page 39

• Manufacturer Part Number: SCA3100 DEMO KIT
• Description: KIT DEMO ACCELEROMETER SCA3100
• Manufacturer: VTI Technologies

Specifications of SCA3100 DEMO KIT

• Sensor Type: Accelerometer, 3 Axis
• Sensing Range: ±2g
• Interface: SPI
• Sensitivity: 900 counts/g
• Voltage - Supply: 3 V ~ 3.6 V
• Embedded: No
• Utilized Ic / Part: SCA3100 Series
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 551-1056

8.4 Noise
8.5 Bandwidth
8.6 Cross-axis sensitivity
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www.vti.fi
Output
@
acc
=
nominal output [counts] on input acceleration acc, Sens is sensor’s nominal sensitivity [counts/g] and
FS is sensor’s full scale measuring range [g] (for example for SCA3000-D01 ±2g → FS = 2 g).
Sensor’s ideal output Output
sensitivity calibration points (the red straight line in Figure 23). Nominal output is calculated by
Equation 8
where Output
sensor’s measured output [counts] at +1 g input acceleration and Output
output at -1 g input acceleration. Possible offset term [counts] is included into nominal output,
because it is not included in to linearity error.
Output noise n
values when the sensor is in 0 g position at room temperature. Average noise/axis is calculated by
Equation 9
where n is sensor’s noise [g] per axis, n
and n
SCA3000 demo-kit design can be used as a reference design for noise measurements, refer to
“SCA3000 DEMO KIT User Manual 8259300”.
Signal bandwidth is measured in a shaker by sweeping the piston movement frequency with
constant amplitude (Figure 24).
Cross-axis sensitivity is sum of the alignment and the inherent sensitivity errors. Cross-axis
sensitivity of one axis is a geometric sum of the sensitivities in two perpendicular directions.
Cross-axis sensitivity [%] of X-axis is given by
acc
n
Figure 24. SCA3000 movement in Z-axis bandwidth measurement.
=
Pin #1
⋅
Z
Output
1
3
is sensor’s Z-axis noise [g].
(
n
2
X
X
+
@acc
+
1
n
X
g
, n
Y
2
2
−
is sensor’s nominal output [counts] with input acceleration acc in [g], Output
g
+
Y
Z
Output
n
and n
Z
2
)
,
Doc.Nr. 8257300A.07
Z
−
Y
in X,Y and Z directions is the measured standard deviation of the output
1
g
+
@acc
offset
(in Equation 7) is calculated from the straight line through
=
X
acc
is sensor’s X-axis noise [g], n
Shaker
movement
in parallel
to Z-axis
⋅
Output
+
1
g
2
−
g
Output
Earth’s
gravitation
−
1
g
+
Y
is sensor’s Y-axis noise [g]
Output
-1g
is sensor’s measured
+
1
g
+
2
SCA3000 Series
Output
Rev.A.07
−
1
+1g
g
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,
is