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ADIS16003 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer ADIS16003
Beschreibung Dual-Axis +-1.7 g Accelerometer
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 16 Seiten
ADIS16003 Datasheet, Funktion
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FEATURES
Dual-axis accelerometer
SPI® digital output interface
Internal temperature sensor
Highly integrated; minimal external components;
bandwidth externally selectable
1 mg resolution at 60 Hz
Externally controlled electrostatic self-test
3.0 V to 5.25 V single-supply operation
Low power: <2 mA
3500 g shock survival
7.2 mm × 7.2 mm × 3.6 mm package
APPLICATIONS
Industrial vibration/motion sensing
Platform stabilization
Dual-axis tilt sensing
Tracking, recording, analysis devices
Alarms, security devices
Dual-Axis ±1.7 g Accelerometer
with SPI Interface
ADIS16003
GENERAL DESCRIPTION
The ADIS16003 is a low cost, low power, complete dual-axis
accelerometer with an integrated serial peripheral interface
(SPI). An integrated temperature sensor is also available on the
SPI interface. The ADIS16003 measures acceleration with a full-
scale range of ±1.7 g (minimum), and it can measure both
dynamic acceleration (vibration) and static acceleration
(gravity).
The typical noise floor is 110 μg/√Hz, allowing signals below
1 mg (60 Hz bandwidth) to be resolved.
The bandwidth of the accelerometer is set with optional capaci-
tors CX and CY at the XFILT and YFILT pins. Selection of the
two analog input channels is controlled via the serial interface.
An externally driven self-test pin (ST) allows the user to verify
the accelerometer functionality.
The ADIS16003 is available in a 7.2 mm × 7.2 mm × 3.6 mm,
12-terminal LGA package.
FUNCTIONAL BLOCK DIAGRAM
VCC
DUAL-AXIS
±1.7g
ACCELEROMETER
CDC
SERIAL
INTERFACE
TEMP
SENSOR
COM
ST
YFILT
CY
XFILT
CX
Figure 1.
SCLK
DIN
DOUT
CS
TCS
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or 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.
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Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
© 2005 Analog Devices, Inc. All rights reserved.






ADIS16003 Datasheet, Funktion
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ADIS16003
ABSOLUTE MAXIMUM RATINGS
Table 3.
Parameter
Rating
Acceleration (Any Axis, Unpowered)
Acceleration (Any Axis, Powered)
3,500 g
3,500 g
VCC
All Other Pins
Output Short-Circuit Duration
(Any Pin to Common)
–0.3 V to +7.0 V
(COM – 0.3 V) to
(VCC + 0.3 V)
Indefinite
Operating Temperature Range
–40°C to +125°C
Storage Temperature
–65°C to +150°C
Table 4. Package Characteristics
Package Type
θJA
θJC
12-Terminal LGA 200°C/W 25°C/W
Device Weight
0.3 grams
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
ESD CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on
the human body and test equipment and can discharge without detection. Although this product features
proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy
electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance
degradation or loss of functionality.
0.670
8× BSC
1.127
12× BSC
1.0755
8× BSC
5.873
2×
0.500
12× BSC
Figure 5. Second-Level Assembly Pad Layout
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ADIS16003 pdf, datenblatt
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ADIS16003
Accelerometer Conversion Details
Every time the accelerometer is sampled, the sampling function
discharges the internal CX or CY filtering capacitors by up to 2%
of their initial values (assuming no additional external filtering
capacitors have been added). The recovery time for the filter
capacitor to recharge is approximately 10 μs. Thus, sampling the
accelerometer at a rate of 10 kSPS or less does not induce a
sampling error. However, as sampling frequencies increase
above 10 kSPS, one can expect sampling errors to attenuate the
actual acceleration levels.
TEMPERATURE SENSOR SERIAL INTERFACE
Read Operation
Figure 4 shows the timing diagram for a serial read from the
temperature sensor. The TCS line enables the SCLK input. Ten
bits of data and a leading zero are transferred during a read
operation. Read operations occur during streams of 16 clock
pulses. The serial data is accessed in a number of bytes if 10 bits
of data are being read. At the end of the read operation, the
DOUT line remains in the state of the last bit of data clocked
out until TCS goes high, at which time the DOUT line from
the temperature sensor goes three-state.
Write Operation
Figure 4 also shows the timing diagram for the serial write
to the temperature sensor. The write operation takes place at
the same time as the read operation. Data is clocked into the
control register on the rising edge of SCLK. DIN should remain
low for the entire cycle.
Temperature Sensor Control Register
MSB LSB
ZERO ZERO ZERO ZERO ZERO ZERO ZERO ZERO
Table 7. Temperature Sensor Control Register Bit Functions
Bit
Mnemonic
Comments
7 to 0 ZERO
All bits should be held low.
ZERO
ZERO is defined as the logic low level.
Output Data Format
The output data format for the temperature sensor is twos
complement. Table 8 shows the relationship between the digital
output and the temperature.
Temperature Sensor Conversion Details
The ADIS16003 features a 10-bit digital temperature sensor
that allows an accurate measurement of the ambient device
temperature to be made.
The conversion clock for the temperature sensor is internally
generated so no external clock is required except when reading
from and writing to the serial port. In normal mode, an internal
clock oscillator runs the automatic conversion sequence.
A conversion is initiated approximately every 350 μs. At this
time, the temperature sensor wakes up and performs a tempera-
ture conversion. This temperature conversion typically takes
25 μs, at which time the temperature sensor automatically shuts
down. The result of the most recent temperature conversion is
available in the serial output register at any time. Once the
conversion is finished, an internal oscillator starts counting and
is designed to time out every 350 μs. The temperature sensor
then powers up and does a conversion. Note that if the TCS is
brought low every 350 μs (±30%) or less, then the same
temperature value is output onto the DOUT line every time
without changing. It is recommended that the TCS line not be
brought low every 350 μs (±30%) or less. The ±30% covers
process variation. The TCS should become active (high to low)
outside this range.
The device is designed to auto convert every 350 μs. If the
temperature sensor is accessed during the conversion process,
an internal signal is generated to prevent any update of the
temperature value register during the conversion. This prevents
the user from reading back spurious data. The design of this
feature results in this internal lockout signal being reset only at
the start of the next auto conversion. Therefore, if the TCS line
goes active before the internal lockout signal is reset to its
inactive mode, the internal lockout signal is not reset. To ensure
that no lockout signal is set, bring TCS low at a greater time
than 350 μs (±30%). As a result, the temperature sensor is not
interrupted during a conversion process.
In the automatic conversion mode, every time a read or write
operation takes place, the internal clock oscillator is restarted at
the end of the read or write operation. The result of the conver-
sion is typically available 25 μs later. Reading from the device
before conversion is complete provides the same set of data.
Table 8. Temperature Sensor Data Format
Temperature
Digital Output (DB9 … DB0)
–40°C
11 0110 0000
–25°C
11 1001 1100
–0.25°C
11 1111 1111
0°C 00 0000 0000
+0.25°C
00 0000 0001
+10°C
00 0010 1000
+25°C
00 0110 0100
+50°C
00 1100 1000
+75°C
01 0010 1100
+100°C
01 1001 0000
+125°C
01 1111 0100
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