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IMU383 Series User's Manual
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4.8.4
Axis Orientation Settings
The unit gives users the ability to set the axes orientation by selecting which axis aligns with the
base axes as well as the sign. The only constraint is the axes must conform to a right-hand
definition. The available settings are described in Section 7.4. The specific selections are
provided in Table 30. The default setting is (-Uy, -Ux, -Uz).
To specify the orientation over SPI requires the user to write to two SPI registers (0x74 and 0x75)
in succession. Writing to register 0x75 prior to 0x74 will have no effect. Additionally, reading
the current orientation from register 0x74 will reset the write and require the user to rewrite the
two bytes again (if done before both bytes are written).
To write the orientation, the user must first select the orientation and corresponding value from
Table 30. Then the value must be split into most-significant and least-significant bytes. The
most-significant byte is then written to register 0x74. This is followed by writing the least-
significant byte to 0x75. Only by writing the two bytes back-to-back will the selection take
effect.
For example, to select an orientation of (-Ux, +Uz, +Uy) the user must write 0x01 to 0x74
followed by 0x11 to 0x75. Note: this register does not require the user to swap bytes for the write
to load the bytes properly, unlike other registers.
4.8.5
Saving the Configuration to EEPROM
The IMU383 enables the user to save certain settings to the EEPROM so they are set
automatically the next time the system is started. This is accomplished by writing to register
0x76, as shown in Table 19.
To save the value written to a register either write the address of the register to 0x76 (to save an
individual configuration setting) or a zero to save all settings.
Doc# 7430-1398-01
Figure 10 IMU383 Bartlett Filter Response
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