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PDF ADIS16375 Data sheet ( Hoja de datos )
| Número de pieza | ADIS16375 | |
| Descripción | Low Noise Six Degrees of Freedom Inertial Sensor | |
| Fabricantes | Analog Devices | |
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Data Sheet
Low Profile, Low Noise
Six Degrees of Freedom Inertial Sensor
ADIS16375
FEATURES
Triaxis digital gyroscope, ±300°/sec
Tight orthogonal alignment: 0.05°
Triaxis digital accelerometer: ±18 g
Delta-angle/velocity calculations
Wide sensor bandwidth: 330 Hz
High sample rate: 2.460 kSPS
Autonomous operation and data collection
No external configuration commands required
Startup time: 500 ms
Factory-calibrated sensitivity, bias, and axial alignment
Calibration temperature range: −40°C to +85°C
SPI-compatible serial interface
Embedded temperature sensor
Programmable operation and control
Automatic and manual bias correction controls
4 FIR filter banks, 120 configurable taps
Digital I/O: data-ready, alarm indicator, external clock
Alarms for condition monitoring
Power-down/sleep mode for power management
Enable external sample clock input: up to 2.25 kHz
Single-command self test
Single-supply operation: 3.3 V
2000 g shock survivability
Operating temperature range: −40°C to +105°C
APPLICATIONS
Precision instrumentation
Platform stabilization and control
Industrial vehicle navigation
Downhole instrumentation
Robotics
FUNCTIONAL BLOCK DIAGRAM
TEMPERATURE
SENSOR
TRIAXIS MEMS
ANGULAR RATE
SENSOR
SIGNAL
CONDITIONING
AND
CONVERSION
CALIBRATION
AND
DIGITAL
PROCESSING
OUTPUT
REGISTERS
AND SPI
INTERFACE
TRIAXIS MEMS
ACCELERATION
SENSOR
SELF-TEST
ADIS16375
ALARMS
DIGITAL
CONTROL
POWER
MANAGEMENT
RST DIO1 DIO2 DIO3 DIO4
Figure 1.
CS
SCLK
DIN
DOUT
VDDRTC
VCC
GND
GENERAL DESCRIPTION
The ADIS16375 iSensor® is a complete inertial system that includes
a triaxis gyroscope and triaxis accelerometer. Each sensor in the
ADIS16375 combines industry-leading iMEMS® technology
with signal conditioning that optimizes dynamic performance.
The factory calibration characterizes each sensor for sensitivity,
bias, alignment, and linear acceleration (gyro bias). As a result,
each sensor has its own dynamic compensation formulas that
provide accurate sensor measurements over a temperature
range of −40°C to +105°C.
The ADIS16375 provides a simple, cost-effective method for
integrating accurate, multiaxis, inertial sensing into industrial
systems, especially when compared with the complexity and
investment associated with discrete designs. All necessary motion
testing and calibration are part of the production process at the
factory, greatly reducing system integration time. Tight orthogonal
alignment simplifies inertial frame alignment in navigation systems.
An improved SPI interface and register structure provide faster
data collection and configuration control.
This compact module is approximately 44 mm × 47 mm × 14 mm
and provides a flexible connector interface that enables multiple
mounting orientation options.
Rev. C
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityisassumedbyAnalogDevices for itsuse,nor foranyinfringementsofpatentsor other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113 ©2010–2012 Analog Devices, Inc. All rights reserved.
1 page  
ADIS16375
Data Sheet
Parameter
FLASH MEMORY
Data Retention4
FUNCTIONAL TIMES5
Power-On Startup Time
Reset Recovery Time
Sleep Mode Recovery Time
Flash Memory Update Time
Flash Memory Test Time
Automatic Self Test Time
CONVERSION RATE
Initial Clock Accuracy
Temperature Coefficient
Sync Input Clock
POWER SUPPLY, VDD
Power Supply Current7
POWER SUPPLY, VDDRTC
Real-Time Clock Supply Current
Test Conditions/Comments
Endurance3
TJ = 85°C
Time until data is available
Using internal clock, 100 SPS
Operating voltage range
Normal mode, VDD = 3.3 V
Sleep mode, VDD = 3.3 V
Power-down mode, VDD = 3.3 V
Operating voltage range
Normal mode, VDDRTC = 3.3 V
Min
100,000
20
Typ
500
500
500
375
50
10
2.46
0.02
40
0.76
3.0
173
12.3
120
3.3
13
Max Unit
Cycles
Years
ms
ms
µs
ms
ms
ms
kSPS
%
ppm/°C
2.25 kHz
3.6 V
mA
mA
µA
V
µA
1 Each gyroscope and accelerometer has 32 bits of available resolution. The 16-bit sensitivity shown reflects the register that contains the upper 16 bits of the sensor
output. Divide this number by 2 for every bit added to this resolution in downstream processing routines.
2 The digital I/O signals are driven by an internal 3.3 V supply, and the inputs are 5 V tolerant.
3 Endurance is qualified as per JEDEC Standard 22, Method A117, and measured at −40°C, +25°C, +85°C, and +125°C.
4 The data retention lifetime equivalent is at a junction temperature (TJ) of 85°C as per JEDEC Standard 22, Method A117. Data retention lifetime decreases with junction
temperature.
5 These times do not include thermal settling and internal filter response times (330 Hz bandwidth), which may affect overall accuracy.
6 The 0.7 kHz lower limit is established to support Nyquist sampling criteria for the 330 Hz sensor bandwidth.
7 During startup, the power supply current increases and experiences transient behaviors for a period of 400 µs. The peak current during the 400 µs transient period can
reach 1500 mA.
Rev. C | Page 4 of 28
5 Page 
ADIS16375
Data Sheet
SPI COMMUNICATION
The SPI port supports full duplex communication, as shown in
Figure 15, which enables external processors to write to DIN
while reading DOUT, if the previous command was a read
request. Figure 15 provides a guideline for the bit coding on
both DIN and DOUT.
DEVICE CONFIGURATION
The SPI provides write access to the control registers, one byte at
a time, using the bit assignments shown in Figure 15. Each register
has 16 bits, where Bits[7:0] represent the lower address (listed in
Table 9) 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
second. 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 the DIN sequence is set to 1. The Address Bits[A6:A0]
represent the target address and the Data Command Bits[DC7:DC0]
represent the data being written to the location. Figure 11
provides an example of writing 0x03 to Address 0x00
(PAGE_ID[7:0]), using DIN = 0x8003. This write command
activates the control page for SPI access.
CS
SCLK
NONVOLATILE
FLASH MEMORY
(NO SPI ACCESS)
MANUAL
FLASH
BACKUP
START-UP
RESET
VOLATILE
SRAM
SPI ACCESS
Figure 12. SRAM and Flash Memory Diagram
READING SENSOR DATA
The ADIS16375 automatically starts up and activates Page 0 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 SPI cycles. The first
cycle requests the contents of a register using the bit assignments in
Figure 15, and then the register contents flow out of DOUT during
the second sequence. The first bit in a DIN command is zero,
followed by either the upper or lower address for the register.
The last eight bits are don’t care, but the SPI requires the full set
of 16 SCLKs to receive the request. Figure 13 includes two register
reads in succession, which starts with DIN = 0x1A00 to request
the contents of the Z_GYRO_OUT register and follows with
0x1800 to request the contents of the Z_GYRO_LOW register.
DIN
DIN 0x1A00
0x1800
NEXT
ADDRESS
DIN = 1000 0000 0000 0011 = 0x8003, WRITES 0x03 TO ADDRESS 0x00
Figure 11. SPI Sequence for Activating the Control Page (DIN = 0x8003)
Dual Memory Structure
Writing configuration data to a control register updates its SRAM
contents, which are volatile. After optimizing each relevant control
register setting in a system, use the manual flash update command,
which is located in GLOB_CMD[3] on Page 3 of the register map.
Activate the manual flash update command by turning to Page 3
(DIN = 0x8003) and setting GLOB_CMD[3] = 1 (DIN = 0x8204,
then DIN = 0x8300). Make sure that the power supply is within
specification for the entire 375 ms processing time for a flash
memory update. Table 9 provides a memory map for all of the
user registers, which includes a column for the flash backup
support associated with each register. A yes in this column
indicates that a register has a mirror location in flash and, when
backed up properly, automatically restores itself during startup
or after a reset. Figure 12 provides a diagram of the dual
memory structure used to manage operation and store critical
user settings.
DOUT
Z_GYRO_OUT Z_GYRO_LOW
Figure 13. SPI Read Example
Figure 14 provides an example of the four SPI signals when reading
PROD_ID in a repeating pattern. This is a good pattern to use
for troubleshooting the SPI interface setup and communications
because the contents of PROD_ID are predefined and stable.
CS
SCLK
DIN DIN = 0111 1110 0000 0000 = 0x7E00
DOUT
DOUT = 0011 1111 1111 0111 = 0x3FF7 = 16,375 (PROD_ID)
Figure 14. SPI Read Example, Second 16-Bit Sequence
CS
SCLK
DIN R/W A6 A5 A4 A3 A2 A1 A0 DC7 DC6 DC5 DC4 DC3 DC2 DC1 DC0
R/W A6 A5
DOUT
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
D15 D14 D13
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 15. SPI Communication Bit Sequence
Rev. C | Page 10 of 28
11 Page | ||
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| PDF Descargar | [ Datasheet ADIS16375.PDF ] | |
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