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ADIS16334 Datasheet(PDF) 9 Page - Analog Devices |
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ADIS16334 Datasheet(HTML) 9 Page - Analog Devices |
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9 / 20 page  ADIS16334 Rev. 0 | Page 9 of 20 THEORY OF OPERATION The ADIS16334 is a six degree of freedom (6DOF) inertial sensing system. This sensing system collects data autonomously and makes it available to any processor system that supports a 4-wire serial peripheral interface (SPI). GYROSCOPES Angular rate sensing in the ADIS16334 begins with a MEMS gyroscope that operates on the principle of a resonator gyro. Two polysilicon sensing structures each contain a dither frame that is electrostatically driven to resonance, producing the necessary velocity element to produce a Coriolis force during angular rate. At two of the outer extremes of each frame, orthogonal to the dither motion, are movable fingers that are placed between fixed pickoff fingers to form a capacitive pickoff structure that senses Coriolis motion. The resulting signal is fed to a series of gain and demodulation stages that produce the electrical rate signal output. The dual-sensor design rejects external g-forces and vibration. ACCELEROMETERS Acceleration sensing in the ADIS16334 starts with a MEMS accelerometer core on each axis, which provides a linear motion-to- electrical transducer function. Tiny polysilicon springs to tether a movable structure to a fixed frame inside the sensor core. The springs and mass of the movable structure provide a dependable relationship between acceleration and physical displacement between them. The moving structure and fixed frame have electrical plates in a balanced, differential capacitor network. When experiencing dynamic or static acceleration, it causes a physical deflection, which causes an imbalance in the capacitive network. A modulation/de-modulation circuit translates the capacitor imbalance into a representative electrical signal. DATA SAMPLING AND PROCESSING The analog signals from each inertial sensor feed into a mixed signal processing circuit, which includes buffering, analog filtering, digital sampling, digital filtering, and calibration. CALIBRATION The digital processing stage includes a correction function for each accelerometer and gyroscope sensor. Each sensor within each unit has unique correction formulas, which optimize their bias and sensitivity accuracy over temperature and supply. The full, 6DOF characterization also enables an internal frame alignment, which minimizes cross-axis sensitivity and simplifies frame alignment after system installation. USER INTERFACE SPI Interface The user registers manage user access to both sensor data and configuration inputs. Each 16-bit register has its own unique bit assignment and two addresses: one for its upper byte and one for its lower byte. Table 8 provides a memory map for each register, along with its function and lower byte address. Each data collection and configuration command both use the SPI, which consists of four wires. The chip select (CS) signal activates the SPI interface and the serial clock (SCLK) synchronizes the serial data lines. Input commands clock into the DIN pin, one bit at a time, on the SCLK rising edge. Output data clocks out of the DOUT pin on the SCLK falling edge. As a SPI slave device, the DOUT contents reflect the information requested using a DIN command. CONTROLLER DIGITAL I/O ADC CONTROL REGISTERS OUTPUT REGISTERS FILTERING AND CALIBRATION MEMS SENSOR Figure 9. Simplified Sensor Signal Processing Diagram |
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