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ADIS16488 Datasheet(PDF) 24 Page - Analog Devices

Part # ADIS16488
Description  Ten Degrees of Freedom Inertial Sensor
Download  36 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

ADIS16488 Datasheet(HTML) 24 Page - Analog Devices

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ADIS16488
Data Sheet
Rev. B | Page 24 of 36
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 ADIS16488
offers an optional compensation function for this effect. Turn to
Page 3 (DIN = 0x8003) and set CONFIG[7] = 1 (DIN = 0x9080,
DIN = 0x9100).
Table 74. 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 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 75, Table 76, and Table 77) and
xA_BIAS_LOW (see Table 78, Table 79, and Table 80) 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 75. 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 76. 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 77. 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 78. 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 79. 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 80. 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 81, Table 82, Table 83).
Table 81. 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 82. 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 83. 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%
MAGNETOMETERS
The user calibration registers enable both 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
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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