Triaxial MEMS Capacitive Analog Accelerometer Module
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SILICON DESIGNS, INC. Model 2445 Advanced Accelerometer Solutions Analog Accelerometer Module • Low Noise • 3 Axis Acceleration Sensing • Capacitive Micromachined • Nitrogen Damped • ±5V Single Ended Outputs • Fully Calibrated • Low Power Consumption (see power supply requirements pg2) • -55 to +125°C Operation • Six (6) Wire Connection • Outputs Referenced to External Ground • Responds to DC and AC Acceleration • Non Standard g Ranges Available • Rugged Anodized Aluminum Module Serialized for Traceability • Available G-Ranges Full Scale Acceleration Model Number ±2g ±5g ± 10 g ± 25 g ± 50 g ±100 g ±200 g ±400 g 2445-002 2445-005 2445-010 2445-025 2445-050 2445-100 2445-200 2445-400 DESCRIPTION The Model 2445 is a single-ended output, three-axis accelerometer that operates over a wide temperature range. It combines three orthogonally mounted low noise accelerometers, in a rugged case for measuring accelerations in commercial and industrial environments. This low noise module is tailored for zero to medium frequency instrumentation applications. The anodized aluminum case is epoxy sealed and is easily mounted via two #8 (or M4) screws. The design includes an instrumentation amplifier on each axis providing high drive capability and low output impedance. On-board voltage regulation and an internal voltage reference eliminate the need for precision power supplies. No power supply current flows through the OUTPUT REF wire; this high impedance input is used only as a reference for the acceleration outputs which reduces cross talk among the three channels by rejecting noise from voltage differences between the user's data acquisition equipment and power supply grounds. The 2445 is relatively insensitive to temperature changes and gradients. An initial calibration sheet (2445-CAL) is included and periodic calibration checking is available. 5 4 3 2 1 0 -1 -2 -3 -4 -5 -FULL SCALE (Referenced to OUTPUT REF) OUTPUT VOLTAGE OPERATION The Model 2445 produces three analog voltage outputs, which vary with acceleration. The Z axis is perpendicular to the bottom of the package, with positive acceleration defined as a force pushing on the bottom of the package. The X and Y axis directions are marked on the cover with positive acceleration defined as acceleration in the direction of the axis arrow. The outputs are single ended and vary with respect to the voltage at the OUTPUT REF input which should be approximately centered between the +VS and -VS supply voltages. The output scale factor is independent of the supply voltages from ±12 to ±16 volts. At zero acceleration, the output voltage is nominally zero volts with respect to OUTPUT REF; at ±full scale acceleration the output voltage is ±5 volts. APPLICATIONS 0 + FULL SCALE ACCELERATION • Crash Testing • Machine Control • Vibration Monitoring & Analysis • Modal Analysis • Instrumentation • Rotating Machinery Control • Robotics SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE th Silicon Designs, Inc. • 13905 NE 128 Street, Kirkland WA 98034 • Phone: 425-391-8329 • Fax: 425-391-0446 www.silicondesigns.com [page 1] September 2012

Triaxial Analog Accelerometer Module +VS: (Power) reddish brown wire. -VS: (Power) black wire. Apply -11 to -16 Volts DC with respect to X: (Output) green wire Y: (Output) light brown wire Z: (Output) light blue wire OUTPUT REF: (Input) white wire. The X, Y & Z outputs are referenced to this potential. This input is usually tied to a potential halfway between the +VS and -VS voltages. This input may also be used to offset the output but the voltage difference between this input and either supply voltage (+VS or -VS) must be greater than or equal to 7V. Note 1: Voltages on AOP & AON may...

Triaxial Analog Accelerometer Module Model 2445 Note 4: Tighter tolerances may be available on special order. CABLE SPECIFICATIONS & LENGTH CONSIDERATIONS The cable consists of six 28 AWG (7x36) tin-plated copper wires with FEP insulation. The cable jacket is an FEP tape wrap with a nominal outer diameter of 0.125”. Cable lengths of up to 15 meters (50 feet) can be added to the model 2445's standard 1-meter cable without the need to test for output instability. For lengths longer than 15 meters we recommend you check each individual installation for oscillation by tapping the accelerometer...