SCA3000-D01 datasheet(10/43 Pages) VTI

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:

Any sensing direction can be configured to trigger the interrupt (OR condition).

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

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:

Write "00000011" (03h) into the MODE register (enable motion detection mode,

MODE_BITS = '011').

Acceleration data is not available when the SCA3000 is in motion detection mode.

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:

Write

"00000011"

(03h)

into

MODE

(enable

motion

detection

mode,

MODE_BITS = '011')

Write "00000000" (00h) into UNLOCK register

Write "01010000" (50h) into UNLOCK register

Write "10100000" (A0h) into UNLOCK register

Write "00000010" (02h) into CTRL_SEL register (to select indirect MD_CTRL register)

Unlock sequence for register lock

Write "00000011" (03h) into CTRL_DATA register (this data is written into MD_CTRL

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