CMA3000-A0X Series
Equation 10
2
SZX 2 + SZY
CrossZ = ±
⋅100%,
SZ
where SZX is Z-axis sensitivity to X-axis acceleration [Count/g], SZY is Z-axis sensitivity to Y-axis
acceleration [Count/g] and SZ is sensitivity of Z-axis [Count/g].
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.
5.7 Turn-on time
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.
Acceleration
Supply voltage reaches the
minimum required level
→ CMA3000 starts
CMA3000 output
inside ±1% FS
limits
CMA3000
Z-axis output
Time scale
Turn on time
Figure 13. Turn-on time definition for one axis.
6
Known issues
6.1 Sensing element's bandwidth is lower than the target
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.
VTI Technologies Oy
www.vti.fi
PRELIMINARY - Subject to changes
Doc.Nr. 8282100.05
14/ 17
Rev.05
VTI [ VTI TECHNOLOGIES ]
