ADIS16488A datasheet(26/35 Pages) AD

Part #	ADIS16488A

Description	Tactical Grade, Ten Degrees of Freedom Inertial Sensor

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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

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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