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ADIS16203

Programmable 360° Inclinometer

Analog Devices 

Data Sheet

THEORY OF OPERATION

The ADIS16203 is a calibrated digital inclinometer that provides a

full 360° of measurement range in any rotational plane that is parallel to

the earth’s gravity. A dual-axis accelerometer provides the base-sensing

function, which resolves the earth’s gravity into two orthogonal vectors,

as displayed in Figure 23. A power-efficient approach to a common

trigonometric identity converts these orthogonal vectors into an incline-

angle measurement.

1g

a2

1g

a1

EARTH’S SURFACE

Figure 23. Sensor Measurement Diagram

The digital postprocessing circuit digitizes the sensor outputs and

applies sensitivity/offset calibration coefficients prior to angle

calculations. A factory calibration produces these coefficients using

a full 360° mechanical rotational apparatus. This eliminates the need

for system-level calibration in many cases. In addition to calibrating

the sensor elements, the ADIS16203 corrects for power-supply-

dependent parameters, providing a more robust calibration.

The accuracy of the incline-angle measurements relies on three

important factors: the absence of external (aside from gravity)

acceleration, managing offset errors introduced during system-level

configuration, and maintaining a proper axis of rotation (rotation

plane parallel with earth’s gravity). All of these factors can influence

the acceleration measurements and introduce error. The ADIS16203

provides a simple method for calibrating configuration errors by

providing the INCL_NULL register function. See the Calibration

section for more details. In addition, a 10° tilt plane error can

introduce as much as ±1° of error in the incline-angle outputs.

SYSTEM-LEVEL ORIENTATION OFFSET

TILT PLANE ERROR

ADIS16203

OUTPUT RESPONSE

The incline-angle measurements are linear with respect to

degrees, and the sensor’s orientation produces the output

response displayed in Figure 25. This figure is helpful in

understanding the basic orientation of the inertial sensor

measurement axes.

INCL_OUT = +270°

INCL_180_OUT = –90°

INCL_OUT = 0°

INCL_180_OUT = 0°

BOTTOM

0°

VIEW

(Not to Scale)

INCL_OUT = 180°

INCL_180_OUT = 180°

INCL_OUT = 90°

INCL_180_OUT = 90°

EARTH’S SURFACE

Figure 25. Output Response vs. Orientation

TEMPERATURE SENSOR

An internal temperature sensor monitors the accelerometer’s

junction temperature. The TEMP_OUT data register provides a

digital representation of this measurement. This sensor provides a

convenient temperature measurement for system-level charac-

terization and calibration feedback.

PCB

ATTACHMENT

OFFSET

IDEAL = 90°

EARTH’S SURFACE

Figure 24. ADIS16203 System-Level Orientation

Rev. C | Page 11 of 26

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