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ADIS16488 Datasheet(PDF) 29 Page - Analog Devices

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

ADIS16488 Datasheet(HTML) 29 Page - Analog Devices

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Data Sheet
ADIS16488
Rev. B | Page 29 of 36
SYSTEM CONTROLS
The ADIS16488 provides a number of system-level controls
for managing its operation, which include reset, self-test,
calibration, memory management, and I/O configuration.
GLOBAL COMMANDS
The GLOB_CMD register (see Table 114) provides trigger bits for
several operations. Write 1 to the appropriate bit in GLOB_CMD to
start a function. After the function completes, the bit restores to 0.
Table 114. GLOB_CMD (Page 3, Base Address = 0x02)
Bits
Description
Execution Time
[15:8]
Not used
Not applicable
7
Software reset
120 ms
6
Factory calibration restore
75 ms
[5:4]
Not used
Not applicable
3
Flash memory update
375 ms
2
Flash memory test
50 ms
1
Self-test
12 ms
0
Bias null
See Table 70
Software Reset
Turn to Page 3 (DIN = 0x8003) and then set GLOB_CMD[7] = 1
(DIN = 0x8280, DIN = 0x8300) to reset the operation, which
removes all data, initializes all registers from their flash settings,
and starts data collection. This function provides a firmware
alternative to the RST line (see Table 5, Pin 8).
Automatic Self-Test
Turn to Page 3 (DIN = 0x8003) and then set GLOB_CMD[1] = 1
(DIN = 0x8202, then DIN = 0x8300) to run an automatic self-
test routine, which executes the following steps:
1. Measure output on each sensor.
2. Activate self-test on each sensor.
3. Measure output on each sensor.
4. Deactivate the self-test on each sensor.
5. Calculate the difference with self-test on and off.
6. Compare the difference with internal pass/fail criteria.
7. Report the pass/fail results for each sensor in DIAG_STS.
After waiting 12 ms for this test to complete, turn to Page 0
(DIN = 0x8000) and read DIAG_STS using DIN = 0x0A00.
Note that using an external clock can extend this time. When
using an external clock of 100 Hz, this time extends to 35 ms.
Note that 100 Hz is too slow for optimal sensor performance.
MEMORY MANAGEMENT
The data retention of the flash memory depends on temperature
and the number of write cycles. Figure 25 characterizes the
dependence on temperature, and the FLSHCNT_LOW and
FLSHCNT_HIGH registers (see Table 115 and Table 116)
provide a running count of flash write cycles. The flash updates
every time GLOB_CMD[6], GLOB_CMD[3], or GLOB_CMD[0]
is set to 1.
Table 115. FLSHCNT_LOW (Page 2, Base Address = 0x7C)
Bits
Description
[15:0]
Binary counter; number of flash updates, lower word
Table 116. FLSHCNT_HIGH (Page 2, Base Address = 0x7E)
Bits
Description
[15:0]
Binary counter; number of flash updates, upper word
600
450
300
150
0
30
40
JUNCTION TEMPERATURE (°C)
55
70
85
100
125
135
150
Figure 25. Flash Memory Retention
Flash Memory Test
Turn to Page 3 (DIN = 0x8003), and then set GLOB_CMD[2] = 1
(DIN = 0x8204, DIN = 0x8300) to run a checksum test of the
internal flash memory, which compares a factory-programmed
value with the current sum of the same memory locations. The
result of this test loads into SYS_E_FLAG[6]. Turn to Page 0
(DIN = 0x8000) and use DIN = 0x0800 to read SYS_E_FLAG.
GENERAL-PURPOSE I/O
There are four general-purpose I/O lines: DIO1, DIO2, DIO3, and
DIO4. The FNCTIO_CTRL register controls the basic function
of each I/O line, which provides a number of useful functions.
Each I/O line will only support one function at a time. In cases
where a single line has two different assignments, the enable bit
for the lower-priority function will automatically reset to zero
and be disabled. The priority is (1) data-ready, (2) sync clock
input, (3) alarm indicator, and (4) general-purpose, where 1
identifies the highest priority and 4 indicates the lowest priority.


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