ADIS16480SLASHPCBZ datasheet(31/40 Pages) AD

31 / 40 page

Data Sheet

ADIS16480

Rev. 0 | Page 31 of 40

ACCELEROMETERS

The user calibration for the accelerometers includes registers for

adjusting bias and sensitivity, as shown in Figure 24.

X-AXIS

ACCL

FACTORY

CALIBRATION

AND

FILTERING

X_ACCL_OUT

X_ACCL_LOW

XA_BIAS_HIGH

XA_BIAS_LOW

1 + X_ACCL_SCALE

Figure 24. User Calibration Signal Path, Accelerometers

Manual Bias Correction

The xA_BIAS_HIGH registers (see Table 107, Table 108,

and Table 109) and xA_BIAS_LOW registers (see Table 110,

Table 111, and Table 112) provide a bias adjustment function

for the output of each gyroscope sensor. The xA_BIAS_HIGH

registers use the same format as x_ACCL_OUT registers.

The xA_BIAS_LOW registers use the same format as

x_ACCL_LOW registers.

Table 107. XA_BIAS_HIGH (Page 2, Base Address = 0x1E)

Bits

Description (Default = 0x0000)

[15:0]

X-axis accelerometer offset correction, high word,

Twos complement, 0 g = 0x0000, 1 LSB = 0.8 mg

Table 108. YA_BIAS_HIGH (Page 2, Base Address = 0x22)

Bits

Description (Default = 0x0000)

[15:0]

Y-axis accelerometer offset correction, high word,

Twos complement, 0 g = 0x0000, 1 LSB = 0.8 mg

Table 109. ZA_BIAS_HIGH (Page 2, Base Address = 0x26)

Bits

Description (Default = 0x0000)

[15:0]

Z-axis accelerometer offset correction, high word,

Twos complement, 0 g = 0x0000, 1 LSB = 0.8 mg

Table 110. XA_BIAS_LOW (Page 2, Base Address = 0x1C)

Bits

Description (Default = 0x0000)

[15:0]

X-axis accelerometer offset correction, low word,

Twos complement, 0 g = 0x0000,

1 LSB = 0.8 mg ÷ 216 = ~0.0000122 mg

Table 111. YA_BIAS_LOW (Page 2, Base Address = 0x20)

Bits

Description (Default = 0x0000)

[15:0]

Y-axis accelerometer offset correction, low word,

Twos complement, 0 g = 0x0000,

1 LSB = 0.8 mg ÷ 216 = ~0.0000122 mg

Table 112. ZA_BIAS_LOW (Page 2, Base Address = 0x24)

Bits

Description (Default = 0x0000)

[15:0]

Z-axis accelerometer offset correction, low word;,

Twos complement, 0 g = 0x0000,

1 LSB = 0.8 mg ÷ 216 = ~0.0000122 mg

Manual Sensitivity Correction

The x_ACCL_SCALE registers enable sensitivity adjustment

(see Table 113, Table 114, Table 115).

Table 113. X_ACCL_SCALE (Page 2, Base Address = 0x0A)

Bits

Description (Default = 0x0000)

[15:0]

X-axis accelerometer scale correction,

Twos complement, 0x0000 = unity gain,

1 LSB = 1 ÷ 215 = ~0.003052%

Table 114. Y_ACCL_SCALE (Page 2, Base Address = 0x0C)

Bits

Description (Default = 0x0000)

[15:0]

Y-axis accelerometer scale correction,

Twos complement, 0x0000 = unity gain,

1 LSB = 1 ÷ 215 = ~0.003052%

Table 115. Z_ACCL_SCALE (Page 2, Base Address = 0x0E)

Bits

Description (Default = 0x0000)

[15:0]

Z-axis accelerometer scale correction,

Twos complement, 0x0000 = unity gain,

1 LSB = 1 ÷ 215 = ~0.003052%

MAGNETOMETERS

The user calibration registers enable both hard iron and soft

iron correction, as shown in the following relationship:

























































The MX, MY, and MZ variables represent the magnetometer

data, prior to application of the user correction formula. The

MXC, MYC, and MZC represent the magnetometer data, after the

application of the user correction formula.

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