CMA3000-D0X VTI Hamlin, CMA3000-D0X Datasheet - Page 9

• Manufacturer Part Number: CMA3000-D0X
• Description: Cma3000-d0x Series 3-axis Accelerometer
• Manufacturer: VTI Hamlin

2.4.2
VTI Technologies Oy
www.vti.fi
Usage
Figure 3. The MD band-pass filter's frequency response.
Threshold level can be controlled by MDTHR[6:0] bits and the time condition – how long the
threshold should be exceeded to trigger – by MDTMR[3:0] bits.
Figure 4. Motion detector operation
The MD mode can be enabled by setting the MODE[2:0] bits in the MODE register to "100". The
trigger condition, threshold and duration, can be defined by setting MDTHR and MDFFTMR
registers respectively. The device can be configured to switch automatically into 400Hz
measurement mode by setting the MDET_EXIT bit in CTRL register. See section 3.3 register and
section 2.6 for the interrupt functionality details.
In MD mode, band pass filtered acceleration data with 10Hz output data rate is available in
registers DOUTX, DOUTY and DOUTZ.
Acceleration
X, Y or Z
INT output
+TL
-TL
"1"
"0"
Acceleration exceeds
the threshold level
due to motion ∆T
period of time
T1
T1
Doc.Nr. 8281000.12
T2
T2
T3
T3
T4
T4
T5
T5
T6
T6
∆T
T7
T7
T8
T8
Time
CMA3000-D0X Series
Rev. 0.12
9/ 35