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.