ADIS16488A datasheet(25/35 Pages) AD

Part #	ADIS16488A

Description	Tactical Grade, Ten Degrees of Freedom Inertial Sensor

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Data Sheet

ADIS16488A

Rev. C | Page 25 of 35

Linear Acceleration on Effect on Gyroscope Bias

MEMS gyroscopes typically have a bias responseto linear

acceleration that is normal to their axis of rotation. The

ADIS16488A offers an optional compensation function forthis

effect; the factory default setting (0x00C0)for the CONFIG

register enables this function. To turn it off, turn to Page 3 (DIN

= 0x8003) and set CONFIG[7]= 0 (DIN = 0x8A40, DIN =

0x8B00). Notethat this also keepsthe point of percussion

alignment function enabled.

Table 75. CONFIG(Page 3, Base Address = 0x0A)

Bits

Description (Default = 0x00C0)

[15:8]

Not used

7

Linear-g compensation for gyroscopes (1 = enabled)

6

Point of percussion alignment (1 = enabled)

[5:2]

Not used

1

Real-time clock, daylight savings time

(1: enabled, 0: disabled)

0

Real-time clock control

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

ACCELEROMETERS

The user calibration for the accelerometers includes registersfor

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 76, Table77, and Table 78)and

xA_BIAS_LOW (see Table79, Table 80, and Table 81)registers

providea biasadjustment function fortheoutput of eachaccel-

erometer sensor. The xA_BIAS_HIGH registersuse the same

format as x_ACCL_OUT registers. ThexA_BIAS_LOW

registers use the same format as x_ACCL_LOWregisters.

Table 76. 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 77. 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 78. ZA_BIAS_HIGH (Page 2, Base Address = 0x26)

Bits

Description (Default = 0x0000)

[15:0]

Z-axis accelerometer offset correction, highword,

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

Table 79. XA_BIAS_LOW(Page2, 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 80. 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 81. ZA_BIAS_LOW(Page2, 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_SCALEregisters enable sensitivity adjustment

(see Table 82, Table 83, Table 84).

Table 82. 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 83. 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 84. 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 enableboth hard iron and soft

iron correction, as shown in the following relationship:

























+













×













=













+

H

M

S

M

Z

Y

X

Z

Y

X

ZC

YC

XC

1

33

32

31

23

22

21

13

12

11

wheretheMX, MY, and MZ variablesrepresentthemagnetometer

data prior to application of the user correction formula, and the

MXC, MYC, and MZC representthe magnetometer dataafterthe

application of the user correction formula.

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