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ADIS16385 Datasheet(PDF) 12 Page - Analog Devices

Part # ADIS16385
Description  Six Degrees of Freedom Inertial Sensor
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
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ADIS16385 Datasheet(HTML) 12 Page - Analog Devices

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ADIS16385
Preliminary Technical Data
Rev. PrA | Page 12 of 20
SYSTEM FUNCTIONS
The ADIS16385 provides a number of system-level controls for
managing its operation, using the registers in Table 14.
Table 14. System Tool Registers
Register Name
Address
Description
MSC_CTRL
0x34
Self-test, calibration, data-ready
SLP_CTRL
0x3A
Sleep mode control
DIAG_STAT
0x3C
Error flags
GLOB_CMD
0x3E
Single-command functions
LOT_ID1
0x52
Lot Identification Code 1
LOT_ID2
0x54
Lot Identification Code 2
PROD_ID
0x56
Product identification:
SERIAL_NUM
0x58
Serial number
GLOBAL COMMANDS
The GLOB_CMD register in Table 15 provides trigger bits for
device reset, flash memory management, DAC control, and
calibration control. Start each of these functions by writing a 1 to
the assigned bit in GLOB_CMD. After completing the task, the bit
automatically returns to zero. For example, set GLOB_CMD[7] = 1
(DIN = 0xBE80) to initiate a software reset, which stops the sensor
operation and runs the device through its startup sequence. Set
GLOB_CMD[3] = 1 (DIN = 0xBE04) to back up the user register
contents in nonvolatile flash. This sequence includes loading the
control registers with the data in their respective flash memory
locations prior to producing new data.
Table 15. GLOB_CMD Bit Descriptions
Bits
Description (Default = 0x0000)
Execution Time1
[15:8]
Not used
N/A
[7]
Software reset
4 ms
[6:4]
Not used
N/A
[3]
Flash update
75 ms
[2]
Auxiliary DAC data latch
75 ms
[1]
Factory calibration restore
75 ms
[0]
Automatic bias correction
N/A2
1 N/A = not applicable.
2 Execution time is dependent on SMPL_PRD[12:8] setting.
POWER MANAGEMENT
The SLP_CTRL register, in Table 16, provides two different sleep
modes for system-level management: normal and timed. Set
SLP_CTRL[8] = 1 (DIN = 0xBB01) to start normal sleep mode.
When the device is in sleep mode, the following events can
cause it to wake-up: assert CS from high to low, assert RST
from high to low, or cycle the power. Use SLP_CTRL[7:0] to put
the device into sleep mode for a specified period. For example,
SLP_CNT[7:0] = 0x64 (DIN = 0xBA64) puts the ADIS16385 to
sleep for 50 sec.
Table 16. SLP_CTRL Bit Descriptions
Bits
Description (Default = 0x0000)
[15:9]
Not used
[8]
Normal sleep mode, (1 = start sleep mode)
[7:0]
Timed sleep mode (write 0x01 to 0xFF to start).
Sleep mode duration, binary, 0.5 sec/LSB
PRODUCT IDENTIFICATION
The PROD_ID register in Table 19 contains the binary equivalent
of 16,385. It provides a product-specific variable for systems that
need to track this in their system software. The LOT_ID1 and
LOT_ID2 registers in Table 17 combine to provide a unique, 32-bit
lot identification code. The SERIAL_NUM register in Table 18
contains a binary number that represents the serial number on
the device label. The assigned serial numbers in SERIAL_NUM
are lot specific.
Table 17. LOT_ID1, LOT_ID2 Bit Descriptions
Bits
Description (Default = 0x0000)
[15:0]
Lot identification, binary code
Table 18. SERIAL_NUM Bit Descriptions
Bits
Description (Default = 0x0000)
[15:14]
Reserved
[13:0]
Serial number, 1 to 9999 (0x270F)
Table 19. PROD_ID Bit Descriptions
Bits
Description (Default = 0x0000)
[15:0]
Product identification = 0x4001
MEMORY MANAGEMENT
The FLASH_CNT register in Table 20 provides a 16-bit counter
that helps track the number of write cycles to the nonvolatile
flash memory. The flash updates every time any of the following
bits are set to 1: GLOB_CMD[3] and GLOB[1:0].
Table 20. FLASH_CNT Bit Descriptions
Bits
Description
[15:0]
Binary counter


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