ADIS16480 datasheet(32/40 Pages) AD

32 / 40 page

ADIS16480

Data Sheet

Rev. 0 | Page 32 of 40

Hard Iron Correction

Table 116, Table 117, and Table 118 describe the register format

for the hard iron correction factors: HX, HY, and HZ. These

registers use a twos complement format. Table 119 provides

some numerical examples for converting the digital codes

for these registers into their decimal equivalents.

Table 116. HARD_IRON_X (Page 2, Base Address = 0x28)

Bits

Description (Default = 0x0000)

[15:0]

X-axis magnetometer hard iron correction factor, HX

Twos complement, ±3.2767 gauss range,

0.1 mgauss/LSB, 0 gauss = 0x0000 (see Table 119)

Table 117. 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 119)

Table 118. HARD_IRON_Z (Page 2, 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 119)

Table 119. HARD_IRON_x Data Format Examples

Magnetic Field

Decimal

Hex

Binary

+3.2767 gauss

+32,767

0x7FFF

0111 1111 1111 1111

+0.2 mgauss

0x0002

0000 0000 0000 0010

+0.1 mgauss

0x0001

0000 0000 0000 0001

0 gauss

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 factors for

both sensitivity (S11, S22, S33) and alignment (S12, S13, S21, S23, S31,

S32). The registers that represent each soft iron correction factor

are in Table 120 (S11), Table 121 (S12), Table 122 (S13), Table 123

(S21), Table 124 (S22), Table 125 (S23), Table 126 (S31), Table 127

(S32), and Table 128 (S33). Table 129 offers some numerical

examples for converting between the digital codes and their

effect on the magnetometer output, in terms of percent-change.

Table 120. 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 129 for examples

Table 121. 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 129 for examples

Table 122. 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 129 for examples

Table 123. 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 129 for examples

Table 124. 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 129 for examples

Table 125. 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 129 for examples

Table 126. SOFT_IRON_S31 (Page 2, Base Address = 0x3A)

Bits

Description (Default = 0x0000)

[15:0]

Magnetometer soft iron correction factor, S31

Twos complement format, see Table 129 for examples

Table 127. 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 129 for examples

Table 128. 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 129 for examples

Table 129. Soft Iron Correction, Numerical Examples

Delta (%)

Decimal

Hex

Binary

+100 – 1/216

+32,767

0x7FFF

0111 1111 1111 1111

+200/215

0x0002

0000 0000 0000 0010

+100/215

0x0001

0000 0000 0000 0001

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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