CMA3000-A0X VTI Hamlin, CMA3000-A0X Datasheet - Page 14

• Manufacturer Part Number: CMA3000-A0X
• Description: Cma3000-a0x Series 3-axis Accelerometer
• Manufacturer: VTI Hamlin

5.7 Turn-on time
6
6.1 Sensing element's bandwidth is lower than the target
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www.vti.fi
Known issues
Equation 10
where S
acceleration [Count/g] and S
Cross-axis sensitivity of CMA3000 family is measured in centrifuge over specified measurement
range during qualification. Correct mounting position of component is important during the
measurement of cross-axis sensitivity.
Turn-on time is the time when the last of one X, Y, Z axis output readings stabilizes into its final
value after XRESET is pulled high. The final value limits in turn-on time measurements is defined to
be ±1 % of the sensor’s full scale measuring range (for example for CMA3000-A01 ±2g →
FS = 2 g). Turn-on time definition for Z-axis is presented in Figure 13 below.
Due to design issue (to be corrected) sensing element's mechanical bandwidth is lower than the
target. As a result, without external load capacitors the bandwidth to X and Z direction is typically
90 Hz and to Y direction typically 150 Hz.
Cross
Acceleration
Figure 13. Turn-on time definition for one axis.
CMA3000
Z-axis output
Turn on time
Z
ZX
=
±
is Z-axis sensitivity to X-axis acceleration [Count/g], S
S
ZX
PRELIMINARY - Subject to changes
2
S
+
Z
S
ZY
Doc.Nr. 8282100.05
2
⋅
Z
100
is sensitivity of Z-axis [Count/g].
%,
Time scale
Supply voltage reaches th
minimum required level
→ CMA3000 starts
CMA3000 output
inside ±1% FS
limits
ZY
is Z-axis sensitivity to Y-axis
CMA3000-A0X Series
e
Rev.05
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