ADIS16485AMLZ datasheet(21/28 Pages) AD

21 / 28 page

Data Sheet

ADIS16485

Rev. 0 | Page 21 of 28

Linear Acceleration on Effect on Gyroscope Bias

MEMS gyroscopes typically have a bias response to linear

acceleration that is normal to their axes of rotation. The

ADIS16485 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 configuration

enables this function.

Table 66. 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)

ACCELEROMETERS

The user calibration for the accelerometers includes registers for

adjusting bias and sensitivity, as shown in Figure 23.

X-AXIS

ACCL

FACTORY

CALIBRATION

AND

FILTERING

X_ACCL_OUT

X_ACCL_LOW

XA_BIAS_HIGH

XA_BIAS_LOW

1 + X_ACCL_SCALE

Figure 23. User Calibration Signal Path, Gyroscopes

Manual Bias Correction

The xA_BIAS_HIGH (see Table 67, Table 68, and Table 69) and

xA_BIAS_LOW (see Table 70, Table 71, and Table 72) registers

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 67. 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 = 0.25 mg

Table 68. 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 = 0.25 mg

Table 69. 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 = 0.25 mg

Table 70. 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 = 0.25 mg ÷ 216 = ~0.000003815 mg

Table 71. 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 = 0.25 mg ÷ 216 = ~0.000003815 mg

Table 72. 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 = 0.25 mg ÷ 216 = ~0.000003815 mg

Manual Sensitivity Correction

The x_ACCL_SCALE registers enable sensitivity adjustment

(see Table 73, Table 74, Table 75).

Table 73. 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 = ~0.0003052%

Table 74. 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 = ~0.0003052%

Table 75. 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 = ~0.0003052%

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