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DMU30-01

Product catalog summary

General Description: The DMU30 is a high-performance MEMS Inertial Measurement Unit (IMU) offering six degrees of freedom with precise 3-axis outputs for angular rate, acceleration, delta angle, velocity, and temperature at 200Hz. It features VSG3QMAX gyroscopes and capacitive accelerometers, providing an alternative to FOG/RLG IMUs with excellent bias stability and low noise.

Applications: The DMU30 is suitable for hydrographic surveying, airborne mapping, inertial navigation systems, attitude and heading reference systems, GPS drop-out aiding, maritime guidance, GNSS, autonomous vehicle control, machine control, and as a MEMS alternative to FOG/RLG IMUs.

Features: Key features include precision 6-DOF MEMS, compact design (68.5 x 61.5 x 65.5 mm, 330g), internal power conditioning (4.75V to 36V), RS422 interfaces, wide operating temperature range (-40°C to +85°C), and RoHS compliance. Future developments may include GPS, magnetic, and ambient pressure sensing, north finding, and AHRS functions.

Specifications: The DMU30 offers a dynamic range of ±490°/s for angular measurements and ±10g for linear measurements. It has a bias instability of <0.1°/hr for angular and 15μg for linear measurements. The unit is sealed to IP67 standards and operates within a temperature range of -40°C to +85°C.

Environmental and Power: The DMU30 is designed to withstand operational shocks up to 95g and powered survival shocks up to 1,000g. It supports RS-422 communication with a default data rate of 200Hz and a baud rate of 460,800 BPS. The unit requires a supply voltage between 4.75V and 36V, with a typical power consumption of less than 3 watts.

Performance Characteristics: The datasheet includes various performance graphs showing gyro and accelerometer errors, noise levels, and stability over temperature ranges. These graphs illustrate the unit's reliability and precision under different conditions.

Ordering Information: The DMU30-01 IMU and its evaluation kit are available, with the evaluation kit including an RS422 to USB connector, USB driver, data logging software, cables, and connectors.

Electrical and Physical Interface: The DMU30 uses a 15-way micro-miniature 'D' type socket connector for RS422 communication. The electrical interface includes optional connections and a 120Ω termination resistor for certain inputs. The power input ranges from 4.75V to 36V.

Pin Information: Each pin on the connector has specific functions, such as TOV+/- for Time of Validity signals, AUX+/- for auxiliary inputs, and Rx/Tx for RS422 communication. The chassis ground is not internally connected to the power return and should be grounded externally.

Communication and Synchronization: The DMU30 outputs data at 460,800 baud using RS422 protocol, with messages transmitted at 200 messages per second. The 'Time of Validity' (TOV) signal is used for synchronization, indicating when data was collected.

Operational Message Output: Messages contain 33 words (66 bytes) and include data such as axis rates, accelerations, auxiliary input voltage, and system flags. The message format is big endian.

System BIT Flags: Built-in test functions provide error indications through BIT flags during startup and operation, detailing any faults detected in the system.

Design Tools and Resources: Various resources are available for the DMU30, including brochures, datasheets, evaluation kits, and CAD files. The evaluation kit includes an RS422 to USB converter and data logging software.

Installation Details: The DMU30 is designed for 4-point mounting using M5.0 screws, with alignment achieved through dowel holes. Torque settings depend on the host application.

Axis Definitions and Sensing Points: The DMU30 uses paired gyroscopes and accelerometers to optimize performance for each axis, with specific sensing element positions provided.

Overview: The document is a technical datasheet for the DMU30, a High Performance MEMS Inertial Measurement Unit (HPIMU) developed by Silicon Sensing Systems Limited. It provides detailed information on the construction, operation, and specifications of the DMU30.

Specifications: The DMU30 features two accelerometers per axis, configured in a 'back to back' orientation to minimize errors and noise. The unit does not include size effect compensation, which must be managed externally if necessary.

Construction: The DMU30 is constructed from an aluminum alloy and includes a base, housing, sensor block, sensor assemblies, and IMU electronics. It is designed to be waterproof and is secured to the host system using machine screws and dowels for precise alignment.

Sensor Technology: The DMU30 utilizes a Silicon MEMS Inductive Ring Gyroscope and a Silicon MEMS Capacitive Accelerometer. The gyroscope features a unique ring design that enhances balance, thermal stability, and vibration immunity. The accelerometer uses a seismic 'proof mass' to measure linear acceleration through differential capacitance.

Operation: The gyroscope operates by establishing a cos2θ mode of vibration, with the Coriolis force causing motion proportional to the rate of turn. The accelerometer measures displacement of the proof mass to determine acceleration. Both sensors employ closed-loop architectures for improved performance over various conditions.

Contact Information: The document provides contact details for Silicon Sensing Systems Limited in the UK and Japan, as well as Pewatron AG in Switzerland and Germany for sales and support.

Catalog excerpts

• Precision 6-DOF MEMS Inertial Measurement Unit • Silicon Sensing’s latest VSG3QMAX inductive gyro and capacitive accelerometer MEMS • Excellent Bias Instability and Random Walk Angular - 0.1°/hr, 0.02°/Vhr Linear - 15qg, 0.05m/s/Vhr • Non-ITAR • Compact and lightweight - 68.5 x 61.5 x 65.5H (mm), 330g • Internal power conditioning to accept 4.75V to 36V input voltage • RS422 interfaces • -40°C to +85°C operating temperature range • Sealed aluminium housing • RoHS compliant • In-house manufacture from MEMS fabrication to IMU calibration • Evaluation kit and integration resources available • First class customer technical support • Future developments and expansion capability Multi sensor MEMS blending Low power ‘sleep’ mode Additional sensor integration - GPS/ Magnetometer/Barometer North finding mode AHRS functionality Other interface protocols and specifications Custom and host application integration Applications • Hydrographic surveying • Airborne survey and mapping • INS (Inertial Navigation Systems) • AHRS (Attitude and Heading Reference System) • GPS drop-out aiding • Maritime guidance and control • GNSS (Global Navigation Satellite System) • Autonomous vehicle control and ROVs • Machine control • MEMS alternative to FOG/RLG IMUs 1 General Description DMU30 is a full six-degree-of-freedom inertial measurement unit providing precise 3-axis outputs of angular rate and acceleration, delta angle and velocity, and temperature, at 200Hz. DMU30 is the first of a new family of High Performance MEMS IMUs (HPIMU) incorporating precision VSG3QMAX high-Q inductive resonating ring gyroscopes and capacitive accelerometers. DMU30 represents a realistic, alternative to established FOG/RLG based IMUs due to its exceptional bias stability and low noise characteristics, yet it is comparatively compact, lightweight and offers low cost of ownership. Designed specifically to meet the growing demand from high-end commercial and industrial market applications for a ‘tactical’ grade non-ITAR IMU, DMU30 utilises Silicon Sensing’s class leading MEMS inertial sensors integrated and calibrated using an in-house state-of-the-art test facility. HPIMU development takes advantage of Silicon Sensing’s wide-ranging multi sensor technologies in a unique architecture to achieve a highly versatile IMU design. Future developments will feature GPS, magnetic and ambient pressure sensing, north finding and AHRS functions. © Copyright 2017 Silicon Sensing Systems Limited. All rights reserved. Silicon Sensing is an Atlantic Inertial Systems, Sumitomo Precision Products joint venture company. Specification subject to change without notice. DMU30-01-0100-132 Rev 3 Page 1 Competitive senso

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Technical Datasheet High Performance MEMS Inertial Measurement Unit (HPIMU) SILICON# SENSING. www.siliconsensing.com Power Return Tx_Hi Tx_Lo Rx_Lo Rx_Hi Temperature Sensors Wide Bandwidth High Dynamic Range Gyro X Wide Bandwidth High Dynamic Range Gyro Y Wide Bandwidth High Dynamic Range Gyro Z Figure 1.1 DMU30 Functional Block Diagram 68.5 MAX © Copyright 2017 Silicon Sensing Systems Limited. All rights reserved. Silicon Sensing is an Atlantic Inertial Systems, Sumitomo Precision Products joint venture company. Specification subject to change without notice. Page 2 DMU30-01-0100-132 Rev...

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SILICON# SENSING. www.siliconsensing.com Technical Datasheet High Performance MEMS Inertial Measurement Unit (HPIMU)2 Ordering Information Item © Copyright 2017 Silicon Sensing Systems Limited. All rights reserved. Silicon Sensing is an Atlantic Inertial Systems, Sumitomo Precision Products joint venture company. Specification subject to change without notice. DMU30-01-0100-132 Rev 3 Page 3 Competitive sensor & power supply solutions worldwide

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© Copyright 2017 Silicon Sensing Systems Limited. All rights reserved. Silicon Sensing is an Atlantic Inertial Systems, Sumitomo Precision Products joint venture company. Specification subject to change without notice. Page 4 DMU30-01-0100-132 Rev 3 Competitive sensor & power supply solution

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© Copyright 2017 Silicon Sensing Systems Limited. All rights reserved. Silicon Sensing is an Atlantic Inertial Systems, Sumitomo Precision Products joint venture company. Specification subject to change without notice. DMU30-01-0100-132 Rev 3 Page 5 Competitive sensor & power supply solutions worldwide

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© Copyright 2017 Silicon Sensing Systems Limited. All rights reserved. Silicon Sensing is an Atlantic Inertial Systems, Sumitomo Precision Products joint venture company. Specification subject to change without notice. Page 6 DMU30-01-0100-132 Rev 3 Competitive sensor & power supply solutions worldwide

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Notes: Improper handling, such as dropping onto hard surfaces, can generate every high shock levels in excess of 10,000g. The resultant stresses can cause permanent damage to the sensor. Exposure to the Absolute Maximum Ratings for extended periods may affect performance and reliability. © Copyright 2017 Silicon Sensing Systems Limited. All rights reserved. Silicon Sensing is an Atlantic Inertial Systems, Sumitomo Precision Products joint venture company. Specification subject to change without notice. DMU30-01-0100-132 Rev 3 Page 7 Competitive sensor & power supply solutions worldwide

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High Performance MEMS Inertial Measurement Unit (HPIMU) 5 Typical Performance Characteristics This section shows the typical performance of DMU30, operating from a 12V power supply. Figure 5.1 Gyro Bias Error (°/h) over Temperature Figure 5.2 Normalised Gyro Bias Error (°/h) over Temperature Figure 5.3 Gyro Scale Factor Error over Temperature Figure 5.4 Normalised Gyro Scale Factor Error over Temperature Figure 5.5 Gyro Max Non-Linearity Error (±490°/s range) over Temperature Figure 5.6 Gyro Max Non-Linearity Error (±200°/s range) over Temperature © Copyright 2017 Silicon Sensing Systems Limited....

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DMU30-01

DMU30-01

Catalog excerpts

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