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CRM200

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CRM200

Product catalog summary

Features

Compact size: 6.3 x 5.5 x 2.7mm.
Robust silicon MEMS vibrating ring gyro with low bias instability (12º/hr) and low angular random walk (0.2º/√hr).
Multiple sensing options: in-plane, orthogonal, and 20º inclined.
User-selectable dynamic ranges: 75º/s, 150º/s, 300º/s, and 900º/s (up to 1,000º/s).
Analogue and digital (SPI®) output modes.
Adjustable bandwidth up to 160Hz.
Low power consumption (4mA) and high shock/vibration rejection.
Hermetically sealed ceramic LCC package for temperature and humidity resistance.
Integral temperature sensor and RoHS compliant.

Applications

Automotive navigation, precision GPS navigation, vehicle yaw/pitch/roll rate sensing.
Gesture sensing, motion tracking, pointing devices, precision agriculture, antenna stabilization, industrial and robotics.

General Description

The PinPoint® is a single-axis MEMS angular rate sensor capable of measuring angular velocity up to ±1,000º/s. It offers both analogue and digital output modes, selectable by the user. The sensor is available in configurations for in-plane and orthogonal sensing, with options for measuring angular velocities exceeding ±2700º/s.

Specifications

Measurement range: User-selectable dynamic ranges with an absolute limit of 1,000º/s.
Sensitivity: Ratiometric scale factor for analogue output; digital output is not ratiometric.
Bias: Nominal bias at +25°C with variations over temperature and time.
Noise: Rate noise density and angular random walk specified.
Frequency response: User-selectable bandwidth from 5Hz to 160Hz.
Temperature sensor: Digital output only with specified offset and scale factor.
Start-up time: Full performance achieved within 1 second.
Physical and environmental specifications: Mass, misalignment, operating temperature range, shock, and vibration resistance detailed.
Electrical specifications: Supply voltage range, current consumption, and interface details.

Absolute Minimum/Maximum Ratings

Angular velocity and acceleration limits for powered and unpowered states.
Linear acceleration limits and electrical ratings including ESD protection.
Temperature and humidity specifications for operation and storage.

Typical Performance Characteristics

Graphs illustrate typical performance characteristics such as bias error, scale factor error, and current consumption across temperature ranges.

Overview: The CRM200 Technical Datasheet provides detailed specifications and operational guidelines for the CRM200 gyroscope, a precision navigation and pointing device developed by Silicon Sensing Systems Limited. The document includes information on both analogue and digital output modes, startup procedures, and interface details.

Specifications: The CRM200 operates with a supply voltage range of 2.7 to 3.6V. It features selectable dynamic ranges for analogue output mode at ±75°/s, ±150°/s, ±300°/s, or ±900°/s. The gyroscope's bandwidth can be adjusted by changing the value of capacitor C2, with options ranging from 12Hz to 95Hz.

Digital Output Mode: The datasheet includes several figures illustrating digital output characteristics such as temperature output, scale factor error, and bias error across various temperatures and applied rates. These figures help in understanding the gyroscope's performance under different conditions.

Interface and Pin Configuration: The document provides a detailed pinout and peripheral circuit diagrams for both analogue and digital output modes. Key pins include MODE_SEL for selecting output mode, and RESET for initializing the gyroscope. Non-electrical connection pins are designated for mechanical fixing only.

Startup and Reset Procedures: Proper startup involves ensuring a monotonic power-up ramp rate greater than 1V/ms. The reset pin should be held low until a stable VDD is applied to ensure correct initialization.

Built-In Test (BIT): The CRM200 includes a health monitoring system that checks key parameters within the gyro control ASIC. Failures in calibration data or DAC conversion stages will result in a BIT_Out signal indicating a fault.

Glossary: The document concludes with a glossary of terms used throughout the datasheet, including definitions for ADC, ARW, BIT, and others.

Specifications and Functionality
The document describes the operation and specifications of the PinPoint® MEMS gyroscope. The gyroscope uses a silicon ring set into oscillation at its resonant frequency, controlled by an Automatic Gain Control (AGC) circuit. The Built-In Test (BIT) system monitors the drive requirements, setting BIT_Out to false if anomalies are detected, such as electronic drive failure or structural issues.

Angular Rate Output
The angular rate output is derived from the demodulated secondary pick-off signal. If the gyro is rotated beyond its operational limits (>1,000°/s), the demodulator saturates, setting BIT_Out to false. However, BIT_Out remains true if the analogue rate output stage saturates within configured limits.

Performance Monitoring
The balance of the MEMS ring and transducer matching are monitored via the demodulated quadrature signal. Excess quadrature signals indicate potential issues, setting BIT_Out to false. A Commanded Built-In Test (CBIT) can be initiated to test various functionalities, causing a 50°/s offset on the rate signal.

Temperature Sensor
The gyroscope includes an internal temperature sensor accessible via a digital interface. It allows system-level thermal compensation using algorithms like linear fits or lookup tables. The sensor's sensitivity is 2.75 LSB/°C.

Power Supply Noise Rejection
PinPoint® is a ratiometric sensor, meaning its output is influenced by supply voltage. Users should manage noise and ripple in the power supply, especially around frequencies of 22kHz, 66kHz, and 110kHz. A well-regulated supply or digital output is recommended if ratiometric response is undesirable.

Digital Mode and SPI® Interface
To activate digital mode, connect the MODE_SEL input to Vdd. The SPI® interface operates in 'Mode 0' as a slave, transferring data in 6-byte messages. Early samples had a tri-state limitation, corrected in later versions. The SPI® clock frequency should be between 100kHz and 8MHz, with a recommended rate of 1MHz.

Message Structure
Command messages from the host system include a command byte, reserved bytes, and a checksum. Status messages from the gyro include a status byte, data bytes for rate and temperature, and a checksum. The status byte indicates the gyro's operational state and message validity.

Digital Bandwidth and Sampling Rate
The digital output mode's bandwidth is determined by capacitor C2, with a recommended SPI® sampling rate of 1kHz. Rates up to 10kHz are possible, but rates below 500Hz may cause aliasing.

Specifications:
The CRM200 gyroscope is designed for precision navigation and pointing applications. It features a MEMS ring sensor, ASIC, and a hermetically sealed package. The device is available in two configurations: in-plane sensing (CRM100) and orthogonal sensing (CRM200). The gyroscope operates using the Coriolis force effect to detect angular velocity.

Procedures:
1. Message Feedback: Bit 4 indicates the validity of the previous message, with '1' denoting an invalid message.
2. CBIT Functionality: Bit 3 shows whether the Commanded Built In Test is enabled.
3. Rate Range Selection: Bits 1 & 0 allow selection of rate ranges from ±75º/s to ±900º/s.

Design Tools and Resources:
Various resources are available for download, including datasheets, brochures, CAD files, and evaluation boards for both CRM100 and CRM200 models. These resources aid in the assembly, interfacing, and evaluation of the gyroscopes.

Cleaning and Mounting:
Ultrasonic cleaning is not recommended due to the sensor's resonant frequency. The CRM200 can be mounted using surface mounters with specific nozzle sizes. Solder paste is sufficient for holding parts in place before soldering.

Packaging Information:
The CRM200 is packaged in tape and reel, with specific dimensions and materials outlined for each packaging component. The packaging ensures protection and ease of handling during transportation.

Internal Construction and Theory of Operation:
The gyroscope's construction includes a silicon MEMS ring sensor supported by spokes, providing precise balance and thermal stability. The operation relies on the Coriolis effect, with actuators and transducers controlling and detecting ring movements to measure angular velocity. The design offers stability over temperature and immunity to acceleration-induced errors.

Overview: The document is a technical datasheet for the CRM200 Precision Navigation and Pointing Gyroscope, developed by Silicon Sensing Systems Limited. It details the specifications, structure, and functionality of the gyroscope, which is designed for inertial navigation and stability in camera/antenna pointing applications.

Specifications: The gyroscope operates at a frequency of 22kHz and utilizes a combination of primary drive actuators and pick-off transducers to detect radial motion. It features a MEMS ring supported by a silicon pedestal and an ASIC fabricated using a 0.35µm CMOS process. The ASIC and MEMS are connected via gold bond wires, enhancing EMC performance and reducing noise.

Functionality: The gyroscope's operation involves exciting the MEMS ring into a 'Cos2θ' mode, which is elliptical and has a natural frequency of 22kHz. When subjected to angular rate, Coriolis forces cause radial motion detected by secondary pick-off transducers, proportional to the applied rate. The ASIC hosts all control circuitry, ensuring precise signal processing.

Patent Information: Several patents have been filed for the PinPoint® gyro sensors, including US5226321, US5419194, US6698271, and WO2009/119205.

Contact Information: The document provides contact details for Pewatron AG, the distributor, with offices in Switzerland and Germany, and lists various product specialists and sales contacts for different regions and product categories.

Catalog excerpts

SILICON# SENSING. www.siliconsensing.com pinpoint® Precision Navigation and Pointing Gyroscope CRM200 Technical Datasheet Features • Small (6.3 x 5.5 x 2.7mm) • Proven and robust silicon MEMS vibrating ring gyro • Low bias instability (12°/hr) over short integration period (<1s) • Low Angular Random Walk (0.2°/Vhr) • In-plane, orthogonal and 20° inclined sensing options (CRM100 and CRM200) • User selectable dynamic ranges; 75°/s, 150°/s, 300°/s and 900°/s (maximum 1,000°/s) • Analogue and Digital ( SPI® ) output modes • User adjustable bandwidth to 160Hz • 3V nominal supply (2.7 - 3.6V range) • Low power consumption (4mA) • High shock and vibration rejection • Hermetically sealed ceramic LCC surface mount package for temperature and humidity resistance • Integral temperature sensor • Low integration cost • Design tools and resources available • RoHS compliant • AEC Q100 tested Applications • Automotive in-car navigation • Precision GPS vehicle and personal navigation aiding • Vehicle yaw, pitch and roll rate sensing • Gesture sensing • Motion tracking • Pointing devices • Precision agriculture • Antenna stabilisation • Industrial and robotics 1 General Description PinPoint® is a single-axis MEMS angular rate sensor (gyro) capable of measuring angular velocity up to a maximum of ±1,000°/s which has two output modes; an analogue voltage signal which is linearly proportional to angular speed, and a digital signal in SPI® protocol. The choice of output mode; analogue or digital, is determined by the user when connecting it to the user’s host PCBA; details of the electrical interface between PinPoint® and the host PCBA are given in Section 7. PinPoint® is available in several configurations; a) CRM100 which measures angular velocity about an axis perpendicular to the plane of the host PCBA, referred to as ‘in-plane’ sensing, b) CRM200 which measures angular velocity about an axis which is parallel to the plane of the host PCBA, referred to as ‘orthogonal’ sensing and c) CRM102 and CRM202 which are capable of measuring angular velocities in excess of ±2700°/s. With a combination of CRM100 and CRM200 it is possible for the user to measure angular rate of multiple axes (e.g. any combination of pitch, yaw and roll) from a single host PCBA. PinPoint® is supplied as a PCBA surface mountable LCC ceramic packaged device. It comprises five main components; silicon MEMS ring Sensor, Pedestal, ASIC, Package Base and Lid. More details of the construction are given in Section 13. There are eight actuators / transducers distributed evenly around the perimeter of the silicon MEMS ring. Located about its primary axes are a single pair of ‘primary drive’ actuators and a single pair of ‘primary pick-off’ transducers. Located about its secondary axes (at 45° to the primary) are two pairs of ‘secondary pick-off’ transducers see Figure 1.1. The ‘primary drive’ actuators and ‘primary pick-off’ transducers act together in a closed-loop system to excite and control the ring primary operating vibration amplitude and frequency. Secondary ‘pick-off’ transducers detect radial movement at the secondary axes, the magnitude of which is proportional to the angular speed of rotation and from which the gyro derives angular rate. More information about the principles of operation are given in Section 13. © Copyright 2015 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. CRM200-00-0100-132 Rev 9 Page 1

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Precision Navigation and Pointing Gyroscope Technical Datasheet PROG Calibration Reset Trim Sets Interface Control Data_Out / BIT_Out Figure 1.1 CRM200 Functional Block Diagram Figure 1.2 CRM200 Overall Dimensions © Copyright 2015 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.

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SILICON** SENSING. www.siliconsensing.com pinpoint® Precision Navigation and Pointing Gyroscope CRM200 Technical Datasheet2 Ordering Information Part Number 3 Specification Unless stated otherwise, the following specification values assume Vdd = 3.0V and an ambient temperature of +25°C. ‘Over temperature’ refers to the temperature range -40°C to +85°C. © Copyright 2015 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. CRM200-00-0100-132 Rev 9 Page...

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SILICON# SENSING. www.siliconsensing.com pinpoint® Precision Navigation and Pointing Gyroscope CRM200 Technical DatasheetSpecification Continued Parameter © Copyright 2015 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 CRM200-00-0100-132 Rev 9 Competitive sensor & power supply so

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SILICON# SENSING. www.siliconsensing.com pinpoint® Precision Navigation and Pointing Gyroscope CRM200 Technical DatasheetSpecification Continued Parameter © Copyright 2015 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. CRM200-00-0100-132 Rev 9 Page 5 Competitive sensor & power supply solutions worldwide

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SILICON# SENSING. www.siliconsensing.com pinpoint® Precision Navigation and Pointing Gyroscope Technical Datasheet4 Absolute Minimum/Maximum Ratings 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 2015 Silicon Sensing Systems Limited. All rights reserved. Silicon Sensing is an Atlantic Inertial Systems, Sumitomo Precision Products joint venture...

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CRM200

CRM200

Catalog excerpts

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