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SCA3000-D01-10 Datasheet(PDF) 10 Page - VTI technologies |
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SCA3000-D01-10 Datasheet(HTML) 10 Page - VTI technologies |
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10 / 43 page  SCA3000 Series VTI Technologies Oy 10/ 43 www.vti.fi Doc.Nr. 8257300A.07 Rev.A.07 The absolute value of programmable Threshold Level (TL) is 0 < |TL| < FS g (FS is sensor full scale measuring range). NOTE: Due to power consumption optimization, the step size between each step and axis is not the same, see section 3.4 for threshold level details. 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). +TL Acceleration exceeds the threshold level due to motion -TL Acceleration X, Y or Z T1 T2 T3 T4 T5 T6 T7 T8 Time T1 T2 T3 T4 T5 T6 T7 T8 Time INT output "1" "0" Figure 3. Motion detector operation. 2.3.2 Usage 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_Z, REQ_Y, REQ_X, EN_Z, EN_Y and EN_X bits in MD_CTRL register and Z_TH, Y_TH and Z_TH bits in MD_Z_TH, MD_Y_TH and MD_X_TH registers, respectively. See section 3.4 for the configuration register and section 2.7 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. 2.3.3 Examples A simple example of motion detection usage: 1. Write "00000011" (03h) into the MODE register (enable motion detection mode, MODE_BITS = '011'). 2. Acceleration data is not available when the SCA3000 is in motion detection mode. 3. The INT-pin is activated when motion is detected, see section 2.7 for detailed INT-pin information. In the next example, the motion detector is configured to give an interrupt on motion only in the X- OR Y-axis direction: 1. Write "00000011" (03h) into MODE register (enable motion detection mode, MODE_BITS = '011') 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) Unlock sequence for register lock 6. Write "00000011" (03h) into CTRL_DATA register (this data is written into MD_CTRL register, enable trigger on Y-channel, EN_Y = '1', enable trigger on X-channel, EN_X = '1') |
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