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ADIS16489 Datasheet(PDF) 18 Page - Analog Devices

Part # ADIS16489
Description  Seven Degrees of Freedom Inertial Sensor
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

ADIS16489 Datasheet(HTML) 18 Page - Analog Devices

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ADIS16489
Data Sheet
Rev. B | Page 18 of 40
Table 27. X_GYRO_OUT Bit Definitions
Bits
Description
[15:0]
X-axis gyroscope data; high word; twos complement,
±450°/sec range; 0°/sec = 0x0000, 1 LSB = 0.02°/sec
The X_GYRO_LOW (see Table 24 and Table 25) and X_GYRO_
OUT (see Table 26 and
Table 27) registers contain the gyroscope data for the x-axis.
Y-Axis Gyroscope (Y_GYRO_LOW, Y_GYRO_OUT)
Table 28. Y_GYRO_LOW Register Definition
Page
Addresses
Default
Access
Flash Backup
0x00
0x14, 0x15
Not applicable
R
No
Table 29. Y_GYRO_LOW Bit Definitions
Bits
Description
[15:0]
Y-axis gyroscope data; low word
Table 30. Y_GYRO_OUT Register Definition
Page
Addresses
Default
Access
Flash Backup
0x00
0x16, 0x17
Not applicable
R
No
Table 31. Y_GYRO_OUT Bit Definitions
Bits
Description
[15:0]
Y-axis gyroscope data; high word; twos complement,
±450°/sec range; 0°/sec = 0x0000, 1 LSB = 0.02°/sec
The Y_GYRO_LOW (see Table 28 and Table 29) and Y_GYRO_
OUT (see Table 30 and Table 31) registers contain the gyroscope
data for the y-axis.
Z-Axis Gyroscope (Z_GYRO_LOW, Z_GYRO_OUT)
Table 32. Z_GYRO_LOW Register Definition
Page
Addresses
Default
Access
Flash Backup
0x00
0x18, 0x19
Not applicable
R
No
Table 33. Z_GYRO_LOW Bit Definitions
Bits
Description
[15:0]
Z-axis gyroscope data; additional resolution bits
Table 34. Z_GYRO_OUT Register Definition
Page
Addresses
Default
Access
Flash Backup
0x00
0x1A, 0x1B
Not applicable
R
No
Table 35. Z_GYRO_OUT Bit Definitions
Bits
Description
[15:0]
Z-axis gyroscope data; high word; twos complement,
±450°/sec range; 0°/sec = 0x0000, 1 LSB = 0.02°/sec
The Z_GYRO_LOW (see Table 32 and Table 33) and Z_GYRO_
OUT (see Table 34 and Table 35) registers contain the gyroscope
data for the z-axis.
Gyroscope Resolution
Table 36 and Table 37 offer various numerical examples that
demonstrate the format of the angular rate (gyroscopes) data in
both 16-bit and 32-bit formats.
Table 36. 16-Bit Gyroscope Data Format Examples
Rotation Rate
(°/sec)
Decimal
Hex
Binary
+450
+22,500
0x57E4
0101 0111 1110 0100
+0.04
+2
0x0002
0000 0000 0000 0010
+0.02
+1
0x0001
0000 0000 0000 0001
0
0
0x0000
0000 0000 0000 0000
−0.02
−1
0xFFFF
1111 1111 1111 1111
−0.04
−2
0xFFFE
1111 1111 1111 1110
−450
−22,500
0xA81C
1010 1000 0001 1100
Table 37. 32-Bit Gyroscope Data Format Examples
Rotation Rate (°/sec)
Decimal
Hex
+450
+1,474,560,000
0x57E40000
+0.02/215
+2
0x00000002
+0.02/216
+1
0x00000001
0
0
0x00000
−0.02/216
−1
0xFFFFFFFF
−0.02/215
−2
0xFFFFFFFE
−450
−1,474,560,000
0x73600000
ACCELERATION DATA
The accelerometers in the ADIS16489 measure both dynamic
and static (response to gravity) acceleration along three
orthogonal axes (x, y, and z). Figure 20 illustrates the orientation
of each accelerometer axis, along with the direction of
acceleration that produces a positive response in each of their
measurements.
PIN 1
PIN 23
aY
Y-AXIS
X-AXIS
aX
Z-AXIS
aZ
Figure 20. Accelerometer Axis and Polarity Assignments
Each accelerometer has two output data registers. Figure 21
illustrates how these two registers combine to support a 32-bit,
twos complement data format for the x-axis accelerometer
measurements. This format also applies to the y- and z-axes as well.
X-AXIS ACCELEROMETER DATA
0 15
15
0
X_ACCL_OUT
X_ACCL_LOW
Figure 21. Accelerometer Output Data Structure


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