ADXL206(Rev0) データシートの表示（PDF） - Analog Devices

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ADXL206
(Rev.:Rev0)

Precision, ±5 g, Dual-Axis, High Temperature iMEMS Accelerometer

Analog Devices 

USING THE ADXL206 WITH OPERATING VOLTAGES

OTHER THAN 5 V

The ADXL206 is tested and specified at VS = 5 V; however, it

can be powered with VS as low as 3 V or as high as 6 V. Some

performance parameters change as the supply voltage is varied.

The ADXL206 output is ratiometric; therefore, the output

sensitivity (or scale factor) varies proportionally to the supply

voltage. The zero g bias output is also ratiometric; therefore, the

zero g output is nominally equal to VS/2 at all supply voltages.

The output noise is not ratiometric but is absolute in volts;

therefore, the noise density decreases as the supply voltage

increases.

Self-test response in g is roughly proportional to the square of

the supply voltage. However, when ratiometricity of sensitivity

is factored in with supply voltage, self-test response in volts is

roughly proportional to the cube of the supply voltage. There-

fore, at VS = 3 V, the typical self-test response is approximately

50 mV or about 160 mg.

ADXL206

USING THE ADXL206 AS A DUAL-AXIS TILT

SENSOR

One of the most popular applications of the ADXL206 is tilt

measurement. An accelerometer uses the force of gravity as an

input vector to determine the orientation of an object in space.

An accelerometer is most sensitive to tilt when its sensitive axis

is perpendicular to the force of gravity, that is, parallel to the

earth’s surface. At this orientation, the sensitivity of the acceler-

ometer to changes in tilt is highest. When the axis of sensitivity

is parallel to gravity, that is, near its +1 g or −1 g reading, the

change in output acceleration per degree of tilt is negligible.

When the accelerometer is perpendicular to gravity, its output

changes nearly 17.5 mg per degree of tilt. At 45°, its output

changes at only 12.2 mg per degree and resolution declines.

Dual-Axis Tilt Sensor: Converting Acceleration to Tilt

When the accelerometer is oriented so that both its x-axis and

y-axis are parallel to the earth’s surface, it can be used as a 2-axis

tilt sensor with a roll axis and a pitch axis. After the output signal

from the accelerometer is converted to an acceleration that varies

between −1 g and +1 g, the output tilt in degrees is calculated

as follows:

PITCH = arcsin(AX/1 g)

ROLL = arcsin(AY/1 g)

Make sure to account for overranges. It is possible for the

accelerometer to output a signal greater than ±1 g due to

vibration, shock, or other accelerations.

Rev. 0 | Page 11 of 12

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