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ADIS16488A Datasheet(PDF) 26 Page - Analog Devices

Part # ADIS16488A
Description  Tactical Grade, Ten Degrees of Freedom Inertial Sensor
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

ADIS16488A Datasheet(HTML) 26 Page - Analog Devices

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ADIS16488A
Data Sheet
Rev. C | Page 26 of 35
Hard Iron Correction
Table 85, Table 86, and Table 87 describe the registerformatfor
the hard iron correction factors: HX, HY, and HZ. These registers
use a twos complementformat.Table88 provides somenumerical
examples forconverting the digital codes for theseregisters into
their decimal equivalent.
Table 85. HARD_IRON_X (Page2, Base Address = 0x28)
Bits
Description (Default = 0x0000)
[15:0]
X-axis magnetometer hard ironcorrection factor, HX,
twos complement, ±3.2767 gauss range,
0.1 mgauss/LSB, 0 gauss = 0x0000 (see Table 88)
Table 86. HARD_IRON_Y(Page 2, Base Address = 0x2A)
Bits
Description (Default = 0x0000)
[15:0]
Y-axis magnetometer hard iron correction factor, HY,
twos complement, ±3.2767 gauss range,
0.1 mgauss/LSB, 0 gauss = 0x0000 (see Table 88)
Table 87. HARD_IRON_Z (Page2, Base Address = 0x2C)
Bits
Description (Default = 0x0000)
[15:0]
Z-axis magnetometer hard iron correction factor, Hz,
twos complement, ±3.2767 gauss range,
0.1 mgauss/LSB, 0 gauss = 0x0000 (see Table 88)
Table 88. HARD_IRON_x Numerical Examples
Magnetic Field
Decimal
Hex
Binary
+3.2767 gauss
+32,767
0x7FFF
0111 1111 1111 1111
+0.2 mgauss
+2
0x0002
0000 0000 0000 0010
+0.1 mgauss
+1
0x0001
0000 0000 0000 0001
0 gauss
0
0x0000
0000 0000 0000 0000
−0.1 mgauss
−1
0xFFFF
1111 1111 1111 1111
−0.2 mgauss
−2
0xFFFE
1111 1111 1111 1110
−3.2768 gauss
−32,768
0x8000
1000 0000 0000 0000
Soft Iron Correction Matrix
The soft iron correction matrix contains correction factorsfor
both sensitivity (S11, S22, S33) and alignment (S12, S13, S21, S23, S31,
S32). The registers that represent each softiron correction factor
are in Table 89 (S11), Table 90 (S12), Table 91 (S13), Table 92 (S21),
Table 93 (S22), Table 94 (S23), Table 95 (S31), Table 96 (S32), and
Table 97 (S33). Table 98 offers some numerical examples for
converting between the digital codes and their effect on the
magnetometer output, in terms of percent change.
Table 89. SOFT_IRON_S11(Page 2, Base Address = 0x2E)
Bits
Description (Default = 0x0000)
[15:0]
Magnetometer soft iron correction factor, S11,
twos complement format, see Table 98 for examples
Table 90. SOFT_IRON_S12(Page 2, Base Address = 0x30)
Bits
Description (Default = 0x0000)
[15:0]
Magnetometer soft iron correction factor, S12,
twos complement format, see Table 98 for examples
Table 91. SOFT_IRON_S13(Page 2, Base Address = 0x32)
Bits
Description (Default = 0x0000)
[15:0]
Magnetometer soft iron correction factor, S13,
twos complement format, see Table 98 for examples
Table 92. SOFT_IRON_S21(Page 2, Base Address = 0x34)
Bits
Description (Default = 0x0000)
[15:0]
Magnetometer soft iron correction factor, S21, twos
complement format, see Table 98 for examples
Table 93. SOFT_IRON_S22(Page 2, Base Address = 0x36)
Bits
Description (Default = 0x0000)
[15:0]
Magnetometer soft iron correction factor, S22,
twos complement format, see Table 98 for examples
Table 94. SOFT_IRON_S23(Page 2, Base Address = 0x38)
Bits
Description (Default = 0x0000)
[15:0]
Magnetometer soft iron correction factor, S23,
twos complement format, see Table 98 for examples
Table 95. SOFT_IRON_S31(Page 2, Base Address = 0x3A)
Bits
Description (Default = 0x0000)
[15:0]
Magnetometer soft-ironcorrection factor, S31,
twos complement format, see Table 98 for examples
Table 96. SOFT_IRON_S32(Page 2, Base Address = 0x3C)
Bits
Description (Default = 0x0000)
[15:0]
Magnetometer soft iron correction factor, S32,
twos complement format, see Table 98 for examples
Table 97. SOFT_IRON_S33(Page 2, Base Address = 0x3E)
Bits
Description (Default = 0x0000)
[15:0]
Magnetometer soft iron correction factor, S33,
twos complement format, see Table 98 for examples
Table 98. SoftIronCorrection, Numerical Examples
Delta (%)
Decimal
Hex
Binary
+100 – 1/216
+32,767
0x7FFF
0111 1111 1111 1111
+200/215
+2
0x0002
0000 0000 0000 0010
+100/215
+1
0x0001
0000 0000 0000 0001
0
0
0x0000
0000 0000 0000 0000
−100/215
−1
0xFFFF
1111 1111 1111 1111
−200/215
−2
0xFFFE
1111 1111 1111 1110
−100
−32,768
0x8000
1000 0000 0000 0000


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