FIS1100 データシートの表示（PDF） - Fairchild Semiconductor

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FIS1100

6D Inertial Measurement Unit with Motion Co-Processor and Sensor Fusion Library

Fairchild Semiconductor 

Figure 7. Chip Orientation Coordinate System

2.4 Frames of Reference and

Conventions for Using FIS1100

FIS1100 uses a right-handed coordinate system as the

basis for the sensor frame of reference. Acceleration

(ax,ay,az) are given with respect to the X-Y-Z co-

ordinate system shown above. Increasing accelerations

along the positive X-Y-Z axis are considered positive.

Angular Rate (x, y, z) around the counter clockwise

direction are considered positive. Magnetic fields (mx,

my, mz) can be configured to be expressed in the sensor

X-Y-Z coordinates as well. Care must be taken to make

sure that FIS1100 and the magnetic sensor of choice

are mounted on the board so that the coordinate

systems of the two sensors are substantially orthogonal.

Figure 7 shows the various frames of reference and

conventions for using FIS1100.

The accelerometer, gyroscope, and the optional

external magnetometer are enabled or disabled using

the aEN, gEN and mEN bits in the CTRL7 register

respectively. AE Mode may be enabled or disabled

using the sEN bit in CTRL7 register. The outputs

available in Typical Sensor Mode and AttitudeEngine™

Modes are outlined below in Table 22 and Table 23. A

list and description of FIS1100 Operational Modes is

provided in Table 32. A FIFO buffer is also available to

store sample history. The FIFO may be configured

separately using FIFO_CTRL, FIFO_STATUS and

FIFO_DATA. The FIFO control is described in detail in

the FIFO Description section.

© 2015 Fairchild Semiconductor Corporation

FIS1100 • Rev. 1.2

10

www.fairchildsemi.com

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