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ADIS16488A Datasheet(PDF) 25 Page - Analog Devices

Part # ADIS16488A
Description  Tactical Grade, Ten Degrees of Freedom Inertial Sensor
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

ADIS16488A Datasheet(HTML) 25 Page - Analog Devices

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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
H
H
M
M
M
S
S
S
S
S
S
S
S
S
M
M
M
Z
Y
X
Z
Y
X
ZC
YC
XC
1
1
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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