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ADIS16489 Datasheet(PDF) 16 Page - Analog Devices

Part # ADIS16489
Description  Seven Degrees of Freedom Inertial Sensor
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

ADIS16489 Datasheet(HTML) 16 Page - Analog Devices

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ADIS16489
Data Sheet
Rev. B | Page 16 of 40
USER REGISTER DEFINTIONS
PAGE 0 (PAGE_ID)
Table 11. PAGE_ID Register Definition
Page
Addresses
Default
Access
Flash Backup
0x00
0x00, 0x01
0x0000
R/W
No
Table 12. PAGE_ID Bit Definitions
Bits
Description
[15:0]
Page number, binary numerical format
The contents in the PAGE_ID register (see Table 11 and Table 12)
contain the current page setting, and provide a control for selecting
another page for SPI access. For example, set DIN = 0x8002 to
select Page 2 for SPI-based user access. See Table 10 for the
page assignments associated with each user accessible register.
SAMPLE SEQUENCE COUNTER (SEQ_CNT)
When using the internal sampling clock, the barometer output
data registers (BAROM_LOW and BAROM_OUT, see Table 53
and Table 55) update at a rate of 51.25 SPS. When using the
external clock, the barometers update at a rate that is 1/48th of
the input clock frequency. Therefore, the update rates for the
barometer does not change with the DEC_RATE register settings.
SYS_E_FLAG[9] (see Table 16) offers a new data indicator bit
that indicates new, unread data is in the barometer output data
registers. The SEQ_CNT register provides a counter function to
help determine when there is new data in the barometer
registers. When SEQ_CNT = 0x0001, there is new data in the
barometer output registers. When beginning a continuous read
loop, read SEQ_CNT, then subtract this value from the maximum
value of the range (depends on DEC_RATE setting; see Table 14)
to predict the number of internal sample cycles until the next
sample update in the barometer output data registers.
Table 13. SEQ_CNT Register Definition
Page
Addresses
Default
Access
Flash Backup
0x00
0x06, 0x07
Not applicable
R
No
Table 14. SEQ_CNT Bit Definitions
Bits
Description
[15:7]
Don’t care
[6:0]
Binary counter: range = 1 to 48/(DEC_RATE + 1)
STATUS/ERROR FLAG INDICATORS (SYS_E_FLAG)
The SYS_E_FLAG register (see Table 15 and Table 16) provides
various error flags. Reading this register causes all of its bits to
return to 0, with the exception of Bit 7. If an error condition
persists, its flag (bit) automatically returns to an alarm value of 1.
Table 15. SYS_E_FLAG Register Definition
Page
Addresses
Default
Access
Flash Backup
0x00
0x08, 0x09
0x0000
R
No
Table 16. SYS_E_FLAG Bit Definitions
Bits
Description
15
Watch dog timer flag. A 1 indicates that the ADIS16489
automatically reset itself to clear an issue.
[14:13]
Not used.
12
Gyroscope saturation. A 1 indicates that the rate of
rotation on one axis is equal to or greater than
±480°/sec (±1 % tolerance).
[11:10]
Not used.
9
Barometer sample update. A 1 indicates that
BAROM_OUT (see Table 55) and BAROM_LOW (see
Table 53) registers contain new data.
8
Not used.
7
Processing overrun. A 1 indicates the occurrence of a
processing overrun. Initiate a reset to recover. Replace
the ADIS16489 if this error persists. One possible cause
of a processing overrun error is the VDDRTC pin not
being connected to a 3.3 V power supply.
6
Flash memory failure. A 1 indicates that the most
recent flash memory test (GLOB_CMD[2], see Table 151)
failed. Repeat test and replace the ADIS16489 if this
error persists.
5
Sensor failure. A 1 indicates the failure of at least one of
the self-test processes: continuous or on demand. Run
the ODST (GLOB_CMD, Bit 1, see Table 151) when the
unit is in not in motion. Replace the ADIS16489 if the
error persists.
4
Overrange. A 1 indicates that the digital magnitude of
at least one sensor has reached 99% of its maximum
value. Initiate a reset to recover and replace the
ADIS16489 if this error persists.
3
SPI communication error. A 1 indicates that the total
number of SCLK cycles is not equal to an integer multiple
of 16. Repeat the previous communication sequence to
recover. Persistence in this error may indicate a weakness
in the SPI service from the master processor.
[2:1]
Not used.
0
Alarm status flag. A 1 indicates that one of the user-
programmable alarms is active. See the ALM_STS
register for an indication of which alarm is active.
SELF TEST ERROR FLAGS (DIAG_STS)
Table 17. DIAG_STS Register Definition
Page
Addresses
Default
Access
Flash Backup
0x00
0x0A, 0x0B
0x0000
R
No


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