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ADIS16488A Datasheet(PDF) 18 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) 18 Page - Analog Devices

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ADIS16488A
Data Sheet
Rev. C | Page 18 of 35
Table 42. x_MAGN_OUT Data FormatExamples
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 Table43)and BAROM_LOW
register (see Table 45)provideaccess to the barometricpressure
data. These two registerscombine to provide a 32-bit, twos
complement format. Someapplications can use BAROM_OUT
by itself. For cases wherethe finer resolution availablefrom
BAROM_LOWis valuable, combine themin the same manner
as the gyroscopes (see Figure18). When processing data from
the BAROM_OUT register alone, usea 16-bit,twoscomplement
data format.Table43 provides the numerical format forBAROM_
OUT, and Table 44 provides digital coding examples.
Table 43. BAROM_OUT (Page0, Base Address = 0x30)
Bits
Description
[15:0]
Barometric pressure; twoscomplement, ±1.31 bar range,
0 bar = 0x0000, 40 µbar/LSB
Table 44. BAROM_OUT Data FormatExamples
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 registerprovidesadditional resolution for
the barometricpressuremeasurement. The MSBhas a weight of
20 μbar, and each subsequent bit carries a weight of ½ of the
previous one.
Table 45. BAROM_LOW(Page0, Base Address = 0x2E)
Bits
Description
[15:0]
Barometric pressure; additional resolution bits
INTERNAL TEMPERATURE
The TEMP_OUT register provides an internal temperature
measurement forobserving relativetemperaturechangesinside
the ADIS16488A (see Table46). Table 47 provides TEMP_OUT
digital coding examples. Notethat this temperaturereflects a
higher temperature than that of ambienttemperature, dueto
self heating.
Table 46. TEMP_OUT (Page0, Base Address = 0x0E)
Bits
Description
[15:0]
Temperature data; twoscomplement, 0.00565°Cper LSB,
25°C = 0x0000
Table 47. TEMP_OUT Data FormatExamples
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
STATUS/ALARM INDICATORS
The SYS_E_FLAG register in Table 48 providesthesystemerror
flags and new data bits for the magnetometer andbarometer
outputs. The new dataflags trigger data collection of the
magnetometer andbarometer(x_MAGN_OUTandBAROM_xxx
registers)becausethey updateat a fixedratethatis notdependent
on the DEC_RATEsetting.
Reading theSYS_E_FLAG register clearsall of its error flags and
returns each bit to a zero value, with the exception of Bit 7. If
SYS_E_FLAG[7]is high, use thesoftwarereset (GLOB_CMD[7]
(see Table 115)to clear this condition and restorenormal
operation. If any bit in the SYS_E_FLAG register is associated
with an error condition that remains after reading this register,
this bit automatically returns to an alarmvalue of 1.
Table 48. SYS_E_FLAG(Page 0, Base Address = 0x08)
Bits
Description (Default = 0x0000)
[15]
Watch dog timer flag (1 = timed out)
[14:10]
Not used
9
New data flag, barometer (1 = new, unread data)1
8
New data flag, magnetometer (1 = new, unread data)2
7
Processing overrun (1 = error)
6
Flash memory update, result of GLOB_CMD[3] = 1
(1 = failed update, 0 = update successful)
5
Inertial self-test failure (1 = DIAG_STS ≠ 0x0000)
4
Sensor overrange (1 = at least one sensor overranged)
3
SPI communication error
(1 = error condition, when the number of SCLK pulses
is not equal to a multiple of 16)
[2:1]
Not used
0
Alarm status flag (1 = ALM_STS ≠ 0x0000)
1
This flag restores to zero after reading the contents on BAROM_OUT.
2
This flag restores to zero after reading one x_MAGN_OUT register.


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