CRS04-01-PS Rev. A (1/9) TITLE DOC. NUMBER PRODUCT SPECIFICATION FOR SINGLE AXIS REV. CRS04-01-PS A SILICON VIBRATING STRUCTURE GYRO NOTICE NOTICE: This Product Specification defines product performance under the declared conditions only. This Specification does not constitute any form of warranty as to the suitability or fitness of the Product for any particular purpose. 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 A New issue REVISION 20/06/00 REVISED PAGES Business Development Group TOTAL 3 DATE APPROVED 03/08/00 SILICON SENSING SYSTEMS LTD. DATE CHECKED CHECKED PREPARED CRS04-01-PS Rev. A (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. CRS04-01-PS Rev. A (3/9) WARNING Limitations The product to which this specification refers is currently in 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 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. Mechanical Do not drop from more than 300mm onto a hard surface. Environmental -25 degC to +85 degC operation. SILICON SENSING SYSTEMS LTD. CRS04-01-PS Rev. A (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 configured so that rate applied in a counter-clockwise direction, perpendicular to the plane of the pcb and viewed on the sensor head side, will cause the dc output to increase more positively. The gyro is operated with a unipolar power supply. 2. MODEL NUMBER CRS04 - 01 Design Number:: Variant 01 refers to a Non Ratiometric version, For other variants, see the relevant Product Specification Basic Model Number 3. MECHANICAL DESCRIPTION 3.1 EXTERNAL DIMENSIONS The dimensions of the gyro unit including the electronics for signal processing are: Height (Sensor Head) Length (Excluding Header) Width : Nominal 8.45mm (0.333 inch) Maximum 9.00mm (0.354 inch) : Nominal 30.0mm (1.18 inch) : Nominal 30.0mm (1.18inch ) Maximum 30.2mm (1.189 inch) Maximum 30.2mm (1.189 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 11g typical (12g max). The centre of mass is within +/-1cm in all axis. 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. A connection scheme is given in Figure 2. SILICON SENSING SYSTEMS LTD. CRS04-01-PS Rev. A (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 (Non ratiometric) 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) Non Ratiometric version: 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% Noise under quiescent conditions 0.75 deg/s (rms) (1 to 101 Hz) Maximum Noise under quiescent conditions 1.00 deg/s (rms) (1 to 101Hz) 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. CRS04-01-PS Rev. A (6/9) 7. INTERCONNECTIONS 7.1 PIN DEFINITION The interconnections are defined below : Pin Number Function 1 2 3 4 5 +VDC Rate Output Commanded BIT input BITE output Ground 7.2 CBIT operation The CBIT input is a CMOS compatible signal, which when connected to Vcc, causes the rate sensor output to change by approximately 25 degrees per second. This facility is provided to monitor the overall operation of the closed loop sensor, and is NOT to be used for calibration of the rate loop. When asserted, CBIT will cause temporary rate signal loss, for a period of up to 50ms. Similarly, when deasserted, there will be a 50ms loss of rate information. If unused, this pin should be tied to 0V. 7.3 BITE operation The BITE output is a signal which is asserted if any of a number of internal loop parameters exceeds a preset threshold. Like, CBIT, it confirms the basic operation of the loop. Unlike CBIT, it is available at all times, and does not affect loop operation. 8. 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. The sensor is conformally coated as protection against light dewing only. This product is not intended for constant moist environments. SILICON SENSING SYSTEMS LTD. CRS04-01-PS Rev. A (7/9) 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. LIFE 9.1 OPERATING The gyro will have a MTBF of 100,000 hours, under the operation at 35 degC in normal environment. 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. CRS04-01-PS Rev. A (8/9) FIGURE 1 INSTALLATION DRAWING SILICON SENSING SYSTEMS LTD. CRS04-01-PS Rev. A (9/9) Vcc 4.5V to 5.5V dc RATE OUTPUT (+0.59 to +4.41V : Typ.) Pin No.1 SENSOR GND (0V) Pin No.2 Pin No.5 Pin No. 3 CBIT Input (CMOS compatible) Pin No. 4 BITE Output (CMOS compatible) FIGURE 2 CONNECTION SCHEME SILICON SENSING SYSTEMS LTD.