SILICON SENSING SYSTEMS LTD.

CRS02-01-PS Rev. C (1/9)
TITLE
DOC. NUMBER
PRODUCT SPECIFICATION FOR SINGLE AXIS
REV.
CRS02-01-PS
C
SILICON VIBRATING STRUCTURE GYRO
Changes from Revision A:
1. Incorporation of EMI filters
2. Isolation of case from 0V supply
3. Linearity specification
Changes from Revision B
1. Mandatory conformal coat of PCB
2. Revised phase lag specification
3. Revised quiescent noise specification
NOTICE
Applications that require extra reliability and quality possibly
affecting the safety of living things (e.g. transport, combustion,
security, etc.) or any applications, which are thought to be beyond
the focus of the product, should be consulted with SSS first.
COPY TO
BASE
1
B. Dev.
1
C
ECO410040
Pages 4,5
08/05/00
B
ECO410034
Pages 3,4,5,6,9
21/03/00
A
New issue
REVISION
11/10/99
REVISED PAGES
Business Development Group
TOTAL
3
DATE
APPROVED
11/10/99
SILICON SENSING SYSTEMS LTD.
DATE
CHECKED
CHECKED
PREPARED
CRS02-01-PS Rev. C (2/9)
CONTENTS
WARNING
1.
DESCRIPTION
2.
MODEL NUMBER
3.
MECHANICAL DESCRIPTION
3.1
3.2
External Dimensions
Mass
4.
POWER SUPPLY REQUIREMENTS
5.
PERFORMANCE
6.
FREQUENCY RESPONSE
7.
INTERCONNECTIONS
8.
ENVIRONMENTAL CONDITIONS
8.1
8.2
8.3
9.
LIFE
9.1
9.2
10.
Climatic Environment
Mechanical Environment
EMI
Operating
Storage
MAINTENANCE
FIGURES
Figure 1
INSTALLATION DRAWING
Figure 2
CONNECTION SCHEME
SILICON SENSING SYSTEMS LTD.
CRS02-01-PS Rev. C (3/9)
WARNING
Limitations
The product to which this specification refers is in continued development and is subject to
change in design and performance. Some changes to performance parameters may occur as
a result of ageing processes.
The following limitations must be applied to avoid damage.
Electrical
Absolute maximum supply voltage
+V = 6.0 V
The unit has no protection against reverse polarity connection of the power supply.
The positive rail is protected against transients of up to +6V.
Product revision A: Supply return is connected to the case internally
Product revision B onward: Absolute maximum voltage (connector pins to case) 100VDC
Mechanical
Do not drop from more than 300mm onto a hard surface.
Do not over-tighten fixing bolts.
Environmental
-25 degC to +85 degC operation.
SILICON SENSING SYSTEMS LTD.
CRS02-01-PS Rev. C (4/9)
1.
DESCRIPTION
The silicon vibrating structure gyroscope (Si-VSG) is a solid state single axis rate sensor. It is a
stand alone unit with dc supplies and dc output proportional to the rate of rotation.
The gyro is operated with the unipolar power supply.
2.
MODEL NUMBER
CRS02 - 01
Design Number
Basic Model Number
3.
MECHANICAL DESCRIPTION
3.1 EXTERNAL DIMENSIONS
The dimensions of the gyro unit including the electronics for signal processing are:
Height
Length
Width
: Nominal 24.9mm (0.98 inch)
: Nominal 57.9mm (2.28 inch)
: Nominal 24.9mm (0.98 inch )
Maximum 25.3mm (0.996 inch)
Maximum 58.3mm (2.295 inch)
Maximum 25.3mm (0.969 inch)
Note: Dimensions in inches are for reference only.
An installation drawing is given in Figure 1.
3.2 MASS
The sensor, including its electronics, has a total mass of 25 g typical (30g max).
The center of mass is within +/-1cm in all axis.
3.3 Conformal coating
The PCB within the sensor is conformally coated with an acrylic moisture barrier, except in those
positions where direct electrical contact to the PCB is required during operation.
4.
POWER SUPPLY REQUIREMENTS
Operating voltage
+4.85 to +5.15V
Noise and Ripple
DC to 100Hz :<15mV rms
Operating current
< 35 mA (Typ), 40mA Max.
The unit has no protection against reverse polarity connection of the power supply and the positive
rail is protected against transients of up to +6V with respect to supply return. Product revision B
incorporates filters in series with each of the supply and output pins, which are referenced to the
conductive casing. No pin should be allowed to exceed 100V with respect to the case.
A connection scheme is given in Figure 2.
SILICON SENSING SYSTEMS LTD.
CRS02-01-PS Rev. C (5/9)
5.
PERFORMANCE
Rate Range
+/- 150 deg/s.
Output Type
Analogue voltage (Non ratiometric)
Output impedance : 100 ohms typ.
Output current
0.5mA (Min.)
Sensor resonance
No resonant modes below 4.5kHz
Scale Factor
12.75 mV/deg/s
Setting tolerance (ambient)
+/-4% of nominal
Variation with temperature
+/-3% of ambient value
-25 degC to +85 degC
Non Linearity
<+/-0.6% of full scale.
Non Linearity is the maximum deviation from the best
straight line (least squares fit).
Bias (Zero Offset)
Bias setting tolerance (ambient)
2.4 to 2.6 Volts
Bias change over temp. range
+/- 10 deg/s
-25 degC to +85 degC
Bias drift vs. time
<+/- 0.55 deg/s
in 1 sec to 31 sec or any 30sec period
Bias sensitivity to static linear acceleration
<+/- 0.1 deg/s/g on any axis
Total bias variation (All above errors) <+/- 18 deg/s
Cross axis sensitivity
Sensitivity to cross axis rotation
Less than 5% of cross axis rotation rate.
Relative to mounting datum, all axis
Cross axis sensitivity change
Less than 0.3%
±85Hz
Band Width
Typical Noise under quiescent conditions
0.716 deg/s (rms) (1 to 100 Hz)
Maximum Noise under quiescent conditions 0.988 deg/s (rms) (1 to 100 Hz)
Ready time, from application of power
6.
0.6 seconds
FREQUENCY RESPONSE
Phase at 10 Hz
Gain peaking
<=15 degree (Lagging)
<+3 dB
SILICON SENSING SYSTEMS LTD.
CRS02-01-PS Rev. C (6/9)
7.
INTERCONNECTIONS
The interconnections are defined below :
Pin Number
Function
1
2
3
4
5
CASE
8.
+VDC
Rate Output
NC
NC
Supply return / Rate return
Filters ground (Revision B only)
ENVIRONMENTAL CONDITIONS
The gyro performance specifications of Section 5 are not degraded unless otherwise stated when
subjected to the following environment.
8.1 CLIMATIC ENVIRONMENT
Operating Temperature
-25 degC to +85 degC
(Full Performance Specification)
The sensor can operate over the range of –40
degC to +85 degC, but the performance will be
limited and not guaranteed.
Storage Temperature
-40 degC to +85 degC
Operating Temperature Change Rate
Less than +/-3 degC /min
Operating Barometric Pressure
8.5 to 14.9 psi
Storage Barometric Pressure
1.6 to 14.9 psi
Humidity
5 to 95 %RH Non-condensing.
Product revision B onward: the sensor is conformally
coated as protection against light dewing only. This
product is not intended for constant moist environments.
8.2 MECHANICAL ENVIRONMENT
Operating / Storage Shock
200g’s 1ms half sine Approximation
Operating / Storage Vibration
2 g rms 20Hz to 2kHz (Random)
8.3 EMI
2V/m 26MHz to 1GHz
9.
Bias change within noise margin
LIFE
9.1 OPERATING
The gyro will have a MTBF of 100,000 hours, under operation at 25 degC in a normal environment.
SILICON SENSING SYSTEMS LTD.
CRS02-01-PS Rev. C (7/9)
9.2 STORAGE
The storage life of the gyro is greater than 10 years.
10. MAINTENANCE
The gyro is designed to have a long operating and storage life without requiring maintenance.
SILICON SENSING SYSTEMS LTD.
CRS02-01-PS Rev. C (8/9)
FIGURE 1
INSTALLATION DRAWING
SILICON SENSING SYSTEMS LTD.
CRS02-01-PS Rev. C (9/9)
Supply: 4.5V to 5.5V
RATE OUTPUT
(+0.59 to +4.41V : Typ.)
Pin No.1
Supply and Rate return
SENSOR
Pin No.2
Pin No.5
Case Ground
Note: Case is internally connected to Supply / Rate return for Rev A parts only.
FIGURE 2
CONNECTION SCHEME
SILICON SENSING SYSTEMS LTD.