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ADIS16488A Datasheet(PDF) 11 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
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ADIS16488A Datasheet(HTML) 11 Page - Analog Devices

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Product
Overview
Online
Documentation
Design
Resources
Discussion
Sample
& Buy
Data Sheet
ADIS16488A
Rev. C | Page 11 of 35
R/W
R/W
A6
A5
A4
A3
A2
A1
A0
DC7
DC6
DC5
DC4
DC3
DC2
DC1
DC0
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
D12
D13
D14
D15
CS
SCLK
DIN
DOUT
A6
A5
D13
D14
D15
NOTES
1. DOUT BITS ARE PRODUCED ONLY WHEN THE PREVIOUS 16-BIT DIN SEQUENCE STARTS WITH R/W = 0.
2. WHEN CS IS HIGH, DOUT IS IN A THREE-STATE, HIGH IMPEDANCE MODE, WHICH ALLOWS MULTIFUNCTIONAL USE OF THE LINE
FOR OTHER DEVICES.
Figure 13. SPI Communication Bit Sequence
DEVICE CONFIGURATION
The SPI provides write access tothecontrol registers,one byteat
a time, usingthebitassignments shownin Figure 13. Each register
has 16 bits, where Bits[7:0]represent the lower address (listed in
Table 10)and Bits[15:8] represent the upper address. Write to
the lower byte of a register first, followed by a write to its upper
byte (the only register that changes with a single write to its
lower byte is the PAGE_ID register).
For a write command, the first bit in theDINsequence is setto 1.
AddressBits[A6:A0]representthetarget address,andData
CommandBits[DC7:DC0]representthe data being written to the
location. Figure 14 provides an exampleof writing 0x03 to
Address0x00 (PAGE_ID[7:0])usingDIN = 0x8003. This write
command activatesthe control pagefor SPIaccess.
SCLK
CS
DIN
DIN = 1000 0000 0000 0011 = 0x8003, WRITES 0x03 TO ADDRESS 0x00
Figure 14. SPI Sequence for Activating the Control Page (DIN = 0x8003)
Dual Memory Structure
Writing configuration data toa control registerupdatesits SRAM
contents,whicharevolatile.Afteroptimizingeach relevant control
register settingin a system, usethemanual flash updatecommand,
which is located in GLOB_CMD[3]on Page3 of the register map.
Activatethemanual flash updatecommandbyturning toPage3
(DIN = 0x8003)andsetting GLOB_CMD[3]= 1 (DIN= 0x8208,
then DIN =0x8300).For a flash memory update, ensurethatthe
powersupplyis within specification fortheentireprocessing time
(see Table1). Table10 provides a memory mapforall oftheuser
registers, which includesa column offlashbackupinformation. A
yes in this columnindicatesthat a registerhas a mirror locationin
flash and, when backed up properly, automatically restores itself
during startup or after a reset. Figure15 providesa diagram of
the dual memory structurethat supports all device operations
and stores critical user settings.
NONVOLATILE
FLASH MEMORY
(NO SPI ACCESS)
MANUAL
FLASH
BACKUP
START-UP
RESET
VOLATILE
SRAM
SPI ACCESS
Figure 15. SRAM and Flash Memory Diagram
READING SENSOR DATA
The ADIS16488A automatically starts up and activates Page0
for data register access. Write 0x00 to the PAGE_ID register
(DIN = 0x8000) to activate Page 0 for data access after accessing
any other page.
A single register read requires two 16-bit SPIcycles. The first
cycle requeststhecontentsof a register usingthebit assignmentsin
Figure 13, and then the register contentsfollow DOUT during
the second sequence.
The first bit in a DIN command is zero, followedby either the
upper or lower address forthe register. The last eight bits are
don’t care, but the SPIrequires the full set of 16 SCLKs to
receive the request.
Figure 16 includes two register reads in succession, which starts
with DIN = 0x1A00, torequest the contents of theZ_GYRO_OUT
register, and follows with 0x1800, to request the contents of the
Z_GYRO_LOWregister.
DIN
DOUT
0x1A00
0x1800
NEXT
ADDRESS
Z_GYRO_OUT
Z_GYRO_LOW
Figure 16. SPI Read Example
Figure 17 providesan example of the fourSPIsignals when reading
PROD_IDin a repeating pattern. This is aneffectivepattern touse
for troubleshooting theSPIinterfacesetup and communications
becausethe contents of PROD_IDarepredefinedand stable.
SCLK
CS
DIN
DOUT
DOUT = 0100 0000 0110 1000 = 0x4068 = 16,488 (PROD_ID)
DIN = 0111 1110 0000 0000 = 0x7E00
Figure 17. SPI Read Example, Second 16-Bit Sequence


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