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ADIS16488 Datasheet(PDF) 17 Page - Analog Devices

Part No. 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) 17 Page - Analog Devices

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Data Sheet
ADIS16488
Rev. B | Page 17 of 36
MAGNETOMETERS
The registers that use the x_MAGN_OUT format are the primary
registers for the magnetometer measurements. When processing
data from these registers, use a 16-bit, twos complement data
format. Table 38, Table 39, and Table 40 provide each register’s
numerical format, and Table 41 provides x_MAGN_OUT digital
coding examples.
Table 38. X_MAGN_OUT (Page 0, Base Address = 0x28)
Bits
Description
[15:0]
X-axis magnetometer data; twos complement,
±3.2767 gauss range, 0 gauss = 0x0000,
1 LSB = 0.1 mgauss
Table 39. Y_MAGN_OUT (Page 0, Base Address = 0x2A)
Bits
Description
[15:0]
Y-axis magnetometer data; twos complement,
±3.2767 gauss range, 0 gauss = 0x0000,
1 LSB = 0.1 mgauss
Table 40. Z_MAGN_OUT (Page 0, Base Address = 0x2C)
Bits
Description
[15:0]
Z-axis magnetometer data; twos complement,
±3.2767 gauss range, 0 gauss = 0x0000,
1 LSB = 0.1 mgauss
Table 41. x_MAGN_OUT Data Format Examples
Magnetic Field
Decimal
Hex
Binary
+3.2767 gauss
+32,767
0x7FFF
0111 1111 1111 1111
+0.2 mgauss
+2
0x0002
0000 0000 0000 0010
+0.1 mgauss
+1
0x0001
0000 0000 0000 0001
0 gauss
0
0x0000
0000 0000 0000 0000
−0.1 mgauss
−1
0xFFFF
1111 1111 1111 1111
−0.2 mgauss
−2
0xFFFE
1111 1111 1111 1110
−3.2768 gauss
−32,768
0x8000
1000 0000 0000 0000
BAROMETER
The BAROM_OUT register (see Table 42) and BAROM_LOW
register (see Table 44) provide access to the barometric pressure
data. These two registers combine to provide a 32-bit, twos
complement format. Some applications are able to use
BAROM_OUT by itself. For cases where the finer resolution
available from BAROM_LOW is valuable, combine them in
the same manner as the gyroscopes (see Figure 18). When
processing data from the BAROM_OUT register alone, use a
16-bit, twos complement data format. Table 42 provides the
numerical format in BAROM_OUT, and Table 43 provides
digital coding examples.
Table 42. BAROM_OUT (Page 0, Base Address = 0x30)
Bits
Description
[15:0]
Barometric pressure; twos complement,
±1.31 bar range, 0 bar = 0x0000, 40 µbar/LSB
Table 43. BAROM_OUT Data Format Examples
Pressure (bar)
Decimal
Hex
Binary
+0.00004 × (215 − 1)
+32,767
0x7FFF
0111 1111 1110 1111
+0.00008
+2
0x0002
0000 0000 0000 0010
+0.00004
+1
0x0001
0000 0000 0000 0001
0
0
0x0000
0000 0000 0000 0000
−0.00004
−1
0xFFFF
1111 1111 1111 1111
−0.00008
−2
0xFFFE
1111 1111 1111 1110
−0.00004 × 215
−32,768
0x8000
1000 0000 0000 0000
The BAROM_LOW register provides additional resolution for the
barometric pressure measurement. The MSB has a weight of
20 µbar, and each subsequent bit carries a weight of ½ of the
previous one.
Table 44. BAROM_LOW (Page 0, Base Address = 0x2E)
Bits
Description
[15:0]
Barometric pressure; additional resolution bits
INTERNAL TEMPERATURE
The TEMP_OUT register provides an internal temperature
measurement that can be useful for observing relative temperature
changes inside of the ADIS16488 (see Table 45). Table 46
provides TEMP_OUT digital coding examples. Note that this
temperature reflects a higher temperature than ambient, due to
self-heating.
Table 45. TEMP_OUT (Page 0, Base Address = 0x0E)
Bits
Description
[15:0]
Temperature data; twos complement,
0.00565°C per LSB, 25°C = 0x0000
Table 46. TEMP_OUT Data Format Examples
Temperature (°C)
Decimal
Hex
Binary
+85
+10,619
0x297B
0010 1001 0111 1011
+25 + 0.0113
+2
0x0002
0000 0000 0000 0010
+25 + 0.00565
+1
0x0001
0000 0000 0000 0001
+25
0
0x0000
0000 0000 0000 0000
+25 − 0.00565
−1
0xFFFF
1111 1111 1111 1111
+25 − 0.0113
−2
0xFFFE
1111 1111 1111 1110
−40
−11,504
0xD310
1101 0011 0001 0000


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