ADIS16209/PCBZ Analog Devices Inc, ADIS16209/PCBZ Datasheet - Page 10

• Manufacturer Part Number: ADIS16209/PCBZ
• Description: BOARD EVAL FOR ADIS16209
• Manufacturer: Analog Devices Inc
• Series: iMEMS®, iSensor™r

Specifications of ADIS16209/PCBZ

• Sensor Type: Accelerometer, Inclinometer, 2 Axis
• Sensing Range: ±1.7g, ±90°
• Interface: SPI Serial
• Sensitivity: 0.244mg/LSB, 0.025°/LSB
• Voltage - Supply: 3 V ~ 3.6 V
• Embedded: No
• Utilized Ic / Part: ADIS16209
• Silicon Manufacturer: Analog Devices
• Application Sub Type: Accelerometer - Dual-Axis
• Kit Application Type: Sensing - Motion / Vibration / Shock
• Silicon Core Number: ADIS16209
• Kit Contents: Board
• Lead Free Status / RoHS Status: Not applicable / RoHS compliant by exemption
• For Use With: ADISUSBZ - KIT EVAL ADIS W/SOFTWARE USBADISEVALZ - KIT PC EVALUATION W/SOFTWARE
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Not applicable / RoHS compliant by exemption

ADIS16209
THEORY OF OPERATION
The ADIS16209 tilt sensing system uses gravity as its only
stimulus, and a MEMS accelerometer as its sensing element.
MEMS accelerometers typically employ a tiny, spring-loaded
structure that is interlaced with a fixed pick-off finger structure.
The spring constant of the floating structure determines how
far it moves when subjected to a force. This structure responds
to dynamic forces associated with acceleration and to static
forces, such as gravity.
Figure 16 and Figure 17 illustrate how the accelerometer
responds to gravity, according to its orientation, with respect
to gravity. Figure 16 displays the configuration for the incline
angle outputs, and Figure 17 displays the configuration used
for the rotational angle position. This configuration provides
greater measurement range than a single axis. The ADIS16209
incorporates the signal processing circuit that converts accelera-
tion into an incline angle, and it corrects for several known
error sources that would otherwise degrade the accuracy level.
NOTES
1. ROT_OUT = 180° IS 1 LSB DIFFERENT THAN ROT_OUT = –179.975°.
ROT_OUT
XACCL_OUT
YACCL_OUT
GRAVITY
1g
4
5
1
16
16209
–1g
0g
0°
XINCL_OUT = 0°
YINCL_OUT = 0°
8
9
12
13
–0.866g
+0.5g
+30°
0° TILT
LEVEL PLANE
Figure 18. Horizontal Incline Angle Orientation
+90°
+1g
0g
Figure 19. Vertical Angle Orientation
4
Rev. B | Page 10 of 16
5
1
16
+0.866g
+120°
0.5g
0° ≤ XINCL_OUT ≤ 90°
YINCL_OUT = 0°
8
13
9
12
16209
+180°
+1g
0g
Figure 16. Single-Axis Tilt Theory Diagram
Figure 17. Dual-Axis Tilt Theory Diagram
GRAVITY = 1g
GRAVITY = 1g
+0.866g
4
–150°
–0.5g
5
1
16
θ
θ
a
x
x
y
XINCL_OUT = 0°
0° ≤ YINCL_OUT ≤ 90°
8
a
a
x
x
9
θ
θ
x
x
–90°
–1g
0g
12
13
HORIZON
HORIZON
–0.866g
–0.5g
–60°