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ADIS16488 Datasheet(PDF) 15 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) 15 Page - Analog Devices

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Data Sheet
ADIS16488
Rev. B | Page 15 of 36
ACCELERATION
The registers that use the x_ACCL_OUT format are the primary
registers for the accelerometer measurements (see Table 17,
Table 18, and Table 19). When processing data from these
registers, use a 16-bit, twos complement data format. Table 20
provides x_ACCL_OUT digital coding examples.
Table 17. X_ACCL_OUT (Page 0, Base Address = 0x1E)
Bits
Description
[15:0]
X-axis accelerometer data; twos complement,
±18 g range, 0 g = 0x0000, 1 LSB = 0.8 mg
Table 18. Y_ACCL_OUT (Page 0, Base Address = 0x22)
Bits
Description
[15:0]
Y-axis accelerometer data; twos complement,
±18 g range, 0 g = 0x0000, 1 LSB = 0.8 mg
Table 19. Z_ACCL_OUT (Page 0, Base Address = 0x26)
Bits
Description
[15:0]
Z-axis accelerometer data; twos complement,
±18 g range, 0 g = 0x0000, 1 LSB = 0.8 mg
Table 20. x_ACCL_OUT Data Format Examples
Acceleration
Decimal
Hex
Binary
+18 g
+22,500
0x57E4
0101 0111 1110 0100
+1.6 mg
+2
0x0002
0000 0000 0000 0010
+0.8 mg
+1
0x0001
0000 0000 0000 0001
0 mg
0
0x0000
0000 0000 0000 0000
−0.8 mg
−1
0xFFFF
1111 1111 1111 1111
−1.6 mg
−2
0xFFFE
1111 1111 1111 1110
−18 g
−22,500
0xA81C
1010 1000 0001 1100
The registers that use the x_ACCL_LOW naming format
provide additional resolution for the accelerometer
measurements (see Table 21, Table 22, and Table 23). The
MSB has a weight of 0.4 mg, and each subsequent bit has ½
the weight of the previous one.
Table 21. X_ACCL_LOW (Page 0, Base Address = 0x1C)
Bits
Description
[15:0]
X-axis accelerometer data; additional resolution bits
Table 22. Y_ACCL_LOW (Page 0, Base Address = 0x20)
Bits
Description
[15:0]
Y-axis accelerometer data; additional resolution bits
Table 23. Z_ACCL_LOW (Page 0, Base Address = 0x24)
Bits
Description
[15:0]
Z-axis accelerometer data; additional resolution bits
DELTA ANGLES
The delta angle outputs represent an integration of the gyro-
scope measurements and use the following formula for all
three axes (x-axis displayed):
(
)
S
S
n
x
n
x
S
x
f
RATE
DEC
Δt
t
1
_
;
2
,
1
,
+
=
+
×
=
+
ω
ω
θ
where:
ωx is the gyroscope, x-axis.
ΔtS is the time between samples.
When using the internal sample clock, fS is equal to 2.46 kHz.
When using the external clock option, the time between samples
is the time between active edges on the input clock signal, as
measured by the internal clock (252 MHz). See Table 55 for
more information on the DEC_RATE register. The registers
that use the x_DELTANG_OUT format are the primary
registers for the delta angle calculations. When processing data
from these registers, use a 16-bit, twos complement data format
(see Table 24, Table 25, and Table 26). Table 27 provides
x_DELTANG_OUT digital coding examples.
Table 24. X_DELTANG_OUT (Page 0, Base Address = 0x42)
Bits
Description
[15:0]
X-axis delta angle data; twos complement,
±720° range, 0° = 0x0000, 1 LSB = 720°/215 = ~0.022°
Table 25. Y_DELTANG_OUT (Page 0, Base Address = 0x46)
Bits
Description
[15:0]
Y-axis delta angle data; twos complement,
±720° range, 0° = 0x0000, 1 LSB = 720°/215 = ~0.022°
Table 26. Z_DELTANG_OUT (Page 0, Base Address = 0x4A)
Bits
Description
[15:0]
Z-axis delta angle data; twos complement,
±720° range, 0° = 0x0000, 1 LSB = 720°/215 = ~0.022°
Table 27. x_DELTANG_OUT Data Format Examples
Angle (°)
Decimal
Hex
Binary
+720 × (215 − 1)/215
+32,767
0x7FFF
0111 1111 1110 1111
+1440/215
+2
0x0002
0000 0000 0000 0010
+720/215
+1
0x0001
0000 0000 0000 0001
0
0
0x0000
0000 0000 0000 0000
−720/215
−1
0xFFFF
1111 1111 1111 1111
−1440/215
−2
0xFFFE
1111 1111 1111 1110
−720
−32,768
0x8000
1000 0000 0000 0000


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