SILICON DESIGNS, INC
P-Cap
TM
Model 2264
ANALOG ACCELEROMETER MODULE
!
Accurate, Easy-to-Use Alternative to
Piezoresistive Accelerometers
!
Sensitivity Insensitive to Variations in Excitation
Voltage, Temperature and Cable Resistance
!
Frequency Response Insensitive to Temperature
!
6 to 22V Excitation (dual or single supply)
!
Differential Output Signal / EMI Resistant
!
Capacitive Micromachined
!
Nitrogen Damped to 0.7 (nominal)
!
Sensitivity Accurate to 2% (typical)
!
-40 to +85EC Operation
E
!
Traditional Four Wire Connection
!
Responds to DC and AC Accelerations
!
Rugged Anodized Aluminum Module & PTFE Cable
!
Serialized for Traceability
!
Non-Standard g Ranges Available
!
Other Output Sensitivities Available
ORDERING INFORMATION
Full Scale
Acceleration
± 5g
± 10 g
± 25 g
± 50 g
±100 g
±200 g
Model
Number
2264-005
2264-010
2264-025
2264-050
2264-100
2264-200
DESCRIPTION
The P-Cap
TM
model 2264 accelerometer is a high performance and wide temperature range accelerometer intended
to directly replace piezoresistive units for existing and new applications. It uses a capacitive sensing element and
an advanced ASIC to simulate the operation of a piezoresistive bridge. It is tailored for zero to medium frequency
instrumentation applications. The anodized aluminum case is epoxy sealed and is easily mounted via two #4 (or M3)
screws. Internal regulation is provided to eliminate the effects of excitation voltage variation. Unlike piezoresistive
elements, its sensitivity, bias and frequency response are insensitive to temperature changes or thermal gradients.
The cable’s shield is electrically connected to the case while the ground (GND) wire is isolated from the case. An
optional initial calibration sheet (2264-CAL) and periodic calibration checking are also available.
OPERATION
The P-Cap
TM
model 2264 can be operated from supply voltages ranging from ±3 to ±11 VDC. It produces two analog
voltage outputs which vary with acceleration as shown in the graph on the next page. The sensitive axis is
perpendicular to the bottom of the package, with positive acceleration resulting from a force pushing on the bottom
of the package. The signal outputs are fully differential about a common mode voltage that is midway between the
two supply voltages which is 0 volts when equal plus and minus supplies are used. The output sensitivity or scale
factor is independent of changes in the excitation voltage. At zero acceleration, the output differential voltage is
nominally 0 volts DC; at ±full scale acceleration the output differential voltage is ±0.5 volts DC respectively. Single
supply operation is also possible by connecting
-Exc
to ground and
+Exc
to +6 to +22 VDC but the average value of
the
+OUT
and
-OUT
signals will be at ½ the supply voltage and each output will swing from ±0.25 volts around the ½
supply voltage level. Standard cable length is 1 meter.
APPLICATIONS
!
CRASH TESTING
!
VIBRATION MONITORING
!
VIBRATION ANALYSIS
!
MACHINE CONTROL
P-Cap
is a trademark of Silicon Designs, Inc.
!
MODAL ANALYSIS
!
ROBOTICS
!
FLIGHT TESTING
!
MACHINERY INSTRUMENTATION
Silicon Designs, Inc.
!
1445-NW Mall Street, Issaquah, WA 98027-5344
!
Phone: 425-391-8329
!
Fax: 425-391-0446
web site:
www.silicondesigns.com
[page 1]
Apr 07
P-Cap
TM
Model
2264
Analog Accelerometer Module
SIGNAL DESCRIPTIONS
(28 gauge wires + shield)
Power: +Exc (Red) and -Exc (Black):
+Exc (+3 to +11 VDC)
and -Exc (-3 to -11 VDC).
+Out (Green) and -Out (White):
+Out minus -Out voltage is
proportional to acceleration; +Out voltage increases and -Out
decreases with positive acceleration. At zero acceleration both
outputs are nominally equal to mid-way between the +Exc and
the -Exc values. The device experiences positive (+1g)
acceleration with its lid (part number) facing up in the Earth’s
gravitational field. Either output can be used individually or the
two outputs can be used differentially. (See output response
plot below)
PERFORMANCE
- By Model:
+Exc=+5,
-Exc=-5VDC, T
C
=25EC
MODEL NUMBER
Input Range
Frequency Response
(Nominal, -3 dB)
Sensitivity, Differential
Output Noise, Differential
(RMS, typical)
Max. Mechanical Shock
(0.1 ms)
2264-005
±5
0 - 600
100
9
2264-010
±10
0 - 1000
50
10
2264-025
±25
0 - 1500
20
25
2264-050
±50
0 - 2000
10
50
2264-100
±100
0 - 2500
5
100
2264-200
+/-200
0 - 3000
2.5
200
UNITS
g
Hz
mV/g
µg/(root
Hz)
g
2000
PERFORMANCE
- All Models:
Unless otherwise specified,
+Exc=+5,
-Exc=-5VDC, T
C
=25EC, Differential Mode.
PARAMETER
Cross Axis Sensitivity
Bias Calibration Error
Bias Temperature Shift
(T
C
= -40 to +80EC)
Sensitivity Calibration Error
2
MIN
TYP
2
50
MAX
3
5
200
5
+250
0.5
1.0
1.5
0.3
+0.25
±11
13
624
UNITS
%
% of span
(ppm of span)/EC
%
ppm/EC
% of span
%
VDC
VDC
mA DC
mA/volt
µV/µA
grams
grams/meter
Sensitivity Temperature Shift
(T
C
= -40 to +80EC)
-005 thru -050
-100
-200
Sensitivity Change with Excitation Voltage (6-22 volts)
Small Signal Differential Output Impedance
Output Common Mode Voltage
3
Operating Voltage (+Exc/-Exc)
Non-Linearity
1, 2
(-90 to +90% of Full Scale)
Operating Current
(+Out and -Out open)
Change in Operating Current to Excitation Voltage
Shunt Calibration Sensitivity
Mass
(not including cable)
Cable Mass
Note 1: 100g versions and above are tested from -65g to +65g.
Note 2: Tighter tolerances available upon request.
SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE
-250
2
0
0.15
0.25
0.40
0.1
1225
0
±5
10
0.25
612
6
14
-0.25
±3
600
Note 3: Voltage between +Exc and -Exc must not exceed 24V.
P-cap
IS A REGISTERED TRADEMARK OF SILICON DESIGNS, INC.
Silicon Designs, Inc.
!
1445-NW Mall Street, Issaquah, WA 98027-5344
!
Phone: 425-391-8329
!
Fax: 425-391-0446
web site:
www.silicondesigns.com
[page 2]
Apr 07
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