ADIS16480SLASHPCBZ datasheet(30/40 Pages) AD

30 / 40 page

ADIS16480

Data Sheet

Rev. 0 | Page 30 of 40

CALIBRATION

The ADIS16480 factory calibration produces correction formulas

for the gyroscopes, accelerometers, magnetometers, and

barometers, and then programs them into the flash memory.

In addition, there are a series of user configurable calibration

registers, for in-system tuning.

GYROSCOPES

The use calibration for the gyroscopes includes registers for

adjusting bias and sensitivity, as shown in Figure 23.

X-AXIS

GYRO

FACTORY

CALIBRATION

AND

FILTERING

X_GYRO_OUT

X_GYRO_LOW

XG_BIAS_HIGH

XG_BIAS_LOW

1 + X_GYRO_SCALE

Figure 23. User Calibration Signal Path, Gyroscopes

Manual Bias Correction

The xG_BIAS_HIGH registers (see Table 97, Table 98, and

Table 99) and xG_BIAS_LOW registers (see Table 100,

Table 101, and Table 102) provide a bias adjustment function

for the output of each gyroscope sensor.

Table 97. XG_BIAS_HIGH (Page 2, Base Address = 0x12)

Bits

Description (Default = 0x0000)

[15:0]

X-axis gyroscope offset correction, upper word

twos complement, 0°/sec = 0x0000, 1 LSB = 0.02°/sec

Table 98. YG_BIAS_HIGH (Page 2, Base Address = 0x16)

Bits

Description (Default = 0x0000)

[15:0]

Y-axis gyroscope offset correction, upper word;

twos complement, 0°/sec = 0x0000, 1 LSB = 0.02°/sec

Table 99. ZG_BIAS_HIGH (Page 2, Base Address = 0x1A)

Bits

Description (Default = 0x0000)

[15:0]

Z-axis gyroscope offset correction, upper word;

twos complement, 0°/sec = 0x0000, 1 LSB = 0.02°/sec

Table 100. XG_BIAS_LOW (Page 2, Base Address = 0x10)

Bits

Description (Default = 0x0000)

[15:0]

X-axis gyroscope offset correction, lower word;

twos complement, 0°/sec = 0x0000,

1 LSB = 0.02°/sec ÷ 216 = ~0.000000305°/sec

Table 101. YG_BIAS_LOW (Page 2, Base Address = 0x14)

Bits

Description (Default = 0x0000)

[15:0]

Y-axis gyroscope offset correction, lower word;

twos complement, 0°/sec = 0x0000,

1 LSB = 0.02°/sec ÷ 216 = ~0.000000305°/sec

Table 102. ZG_BIAS_LOW (Page 2, Base Address = 0x18)

Bits

Description (Default = 0x0000)

[15:0]

Z-axis gyroscope offset correction, lower word

twos complement, 0°/sec = 0x0000,

1 LSB = 0.02°/sec ÷ 216 = ~0.000000305°/sec

Manual Sensitivity Correction

The x_GYRO_SCALE registers enable sensitivity adjustment

(see Table 103, Table 104, and Table 105).

Table 103. X_GYRO_SCALE (Page 2, Base Address = 0x04)

Bits

Description (Default = 0x0000)

[15:0]

X-axis gyroscope scale correction; twos complement,

0x0000 = unity gain, 1 LSB = 1 ÷ 215 = ~0.003052%

Table 104. Y_GYRO_SCALE (Page 2, Base Address = 0x06)

Bits

Description (Default = 0x0000)

[15:0]

Y-axis gyroscope scale correction; twos complement,

0x0000 = unity gain, 1 LSB = 1 ÷ 215 = ~0.003052%

Table 105. Z_GYRO_SCALE (Page 2, Base Address = 0x08)

Bits

Description (Default = 0x0000)

[15:0]

Z-axis gyroscope scale correction; twos complement,

0x0000 = unity gain, 1 LSB = 1 ÷ 215 = ~0.003052%

Linear Acceleration on Effect on Gyroscope Bias

MEMS gyroscopes typically have a bias response to linear

acceleration that is normal to their axis of rotation. The ADIS16480

offers an optional compensation function for this effect. Turn to

Page 3 (DIN = 0x8003) and set CONFIG[7] = 1 (DIN = 0x9080,

DIN = 0x9100). The factory default setting for this function is

enabled.

Table 106. CONFIG (Page 3, Base Address = 0x0A)

Bits

Description (Default = 0x00C0)

[15:8]

Not used

Linear-g compensation for gyroscopes (1 = enabled)

Point of percussion alignment (1 = enabled)

[5:2]

Not used

Real-time clock, daylight savings time

(1: enabled, 0: disabled)

Real-time clock control

(1: relative/elapsed timer mode, 0: calendar mode)

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