DMU380SA Series
User’s Manual
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Doc# 7430-0026 Rev.01
Page 63
Digital Filter Settings
8.3
These two fields set the digital low pass filter cutoff frequencies (See Table 23). Each
sensor listed is defined in the default factory orientation. Users must consider any
additional rotation to their intended orientation.
Table 23.
Digital Filter Settings
Filter Setting
Sensor
FilterGyro
Ux,Uy,Uz Rate
FilterAccel
Ux,Uy,Uz Accel
Orientation Field
8.4
This field defines the rotation from the factory to user axis sets. This rotation is relative to
the default factory orientation (connector aft, baseplate down). The default factory axis
setting for the DMU380SA orientation field is (-Ux, -Uy, +Uz) as shown in Figure 18
below. With this default orientation, +X is defined as opposite where the connector is
pointing, +Z is down through the base, and +Y is created by making the final orthogonal
axis right-hand-rule. The user axis set is (X, Y, Z) as defined by this default orientation
field loaded at the factory, but this can be changed as per Table 24.
Figure 18.
DMU380 Orientation Field (0x0009)
Table 24.
DMU380 Orientation Definitions
Description
Bits
Meaning
X Axis Sign
0
0 = positive, 1 = negative
X Axis
1:2
0 = Ux, 1 = Uy, 2 = Uz, 3 = N/A
Y Axis Sign
3
0 = positive, 1 = negative
Y Axis
4:5
0 = Uy, 1 = Uz, 2 = Ux, 3 = N/A
Z Axis Sign
6
0 = positive, 1 = negative
Z Axis
7:8
0 = Uz, 1 = Ux, 2 = Uy, 3 = N/A
Reserved
9:15
N/A
There are 24 possible orientation configurations (See Table 25). Setting/Writing the field
to anything else generates a NAK and has no effect.
+Y
(-Uy)
+Z
(+Uz)
+X
(-Ux)
Pitch
Yaw
Roll
