sca3060 VTI Hamlin, sca3060 Datasheet - Page 8

• Manufacturer Part Number: sca3060
• Description: 3-axis Accelerometer
• Manufacturer: VTI Hamlin

2.3.2
2.3.3
VTI Technologies Oy
www.vti.fi
Usage
Examples
The triggering condition can be defined using OR/AND logic:
1. Any sensing direction can be configured to trigger the interrupt (OR condition).
2. Any sensing direction can be configured to be required to trigger the interrupt (AND condition).
Figure 3. Motion detector operation.
The MD mode can be enabled by setting the MODE bits in the MODE register to "011". The trigger
condition can be defined by setting REQ_V3, REQ_V2, REQ_V1, EN_V3, EN_V2 and EN_V1 bits
in MD_CTRL register and V3_TH, V2_TH and V1_TH bits in MD_V3_TH, MD_V2_TH and
MD_V1_TH registers, respectively. See section 3.4 for the configuration register and section 2.5 for
the interrupt functionality details.
In MD mode, acceleration data is not available in registers X_LSB, X_MSB, Y_LSB, Y_MSB,
Z_LSB, Z_MSB and BUF_DATA.
A simple example of motion detection usage:
In the next example, the motion detector is configured to give an interrupt on motion only in the V1-
OR V2-axis direction:
Acceleration
V1, V2 or V3
INT output
1. Write "00000011" (03h) into the MODE register (enable motion detection mode,
2. Acceleration data is not available when the SCA3060 is in motion detection mode.
3. The INT-pin is activated when motion is detected, see section 2.5 for detailed INT-pin
1. Write "00000011" (03h) into MODE register (enable motion detection mode,
2. Write "00000000" (00h) into UNLOCK register
3. Write "01010000" (50h) into UNLOCK register
4. Write "10100000" (A0h) into UNLOCK register
5. Write "00000010" (02h) into CTRL_SEL register (to select indirect MD_CTRL register)
6. Write "00000011" (03h) into CTRL_DATA register (this data is written into MD_CTRL
+TL
-TL
"1"
"0"
MODE_BITS = '011').
information.
MODE_BITS = '011')
register, enable trigger on V2-channel, EN_V2 = '1', enable trigger on V1-channel, EN_V1
= '1')
Acceleration exceeds
the threshold level
due to motion
T1
T1
Doc.Nr. 82 1150 00
T2
T2
T3
T3
T4
T4
T5
T5
T6
T6
T7
T7
Unlock sequence for register lock
T8
T8
Time
Time
SCA3060 Series
Rev B
8/ 31