M-A351AS/AU 3axis Accelerometer GENERAL DESCRIPTION M-A351AS and M-A351AU measures 3axis acceleration with high accuracy and high stability. The M-A351 sensor unit is based on Quartz technology (QMEMS) for high accuracy, high stability, small size, and low power consumption. With up to 100Hz sensor bandwidth and 1000Sps data output rate, the M-A351 sensor unit enables wide dynamic range vibration measurement. The M-A351 sensor unit utilizes unique digital sensing architecture which minimizes the requirement for expensive analog circuit components such as high resolution AD converters. The digital sensing architecture and serial interface also simplifies design integration and eliminates analog noise challenges. The M-A351 series accelerometer simplifies the development and differentiation of industrial seismic, vibration, structural measurement systems. FEATURES Small Size and Lightweight : 24x24x19mm, 12grams Low Noise : 0.5Grms/Hz (Average) High Resolution : 0.06G/LSB Wide Bandwidth : 100Hz (selectable) Output Rate : 1000Sps (selectable) Three Axis Accelerometer : 5G Digital Serial Interface : SPI (M-A351AS) / UART (M-A351AU) Wide Operating Temperature Range : 20C to +85C Low Power Consumption : 66mW, 3.3V Output Mode Selection (each axis) : Acceleration, Tilt Angle, or Tilt Angle Speed SPECIFICATION T =-20C to +85C, VCC=3.15V to 3.45V,1G, unless oth erwise noted. A Parameter Test Conditions / Comments Spec. Unit Acceleration Output Data Type Input Range (*1) Reduced accuracy operating range +/-5 G Input Range (*2) Accuracy guaranteed by specification +/-1 G Null Offset T =25C +/-4 mG A Null Offset Repeatability T =25C and VCC=3.3V for one year after shipment 3 mG A Null Offset Temperature Variation -20C to +85C +/-4 mG T =25C,average 0.5Hz to 6Hz,horizontal (+/-5deg.) 0. 5 Grms/Hz A Noise Density T =25C,peak 0.5Hz to 100Hz,horizontal (+/-5deg.) 60 Grms/Hz A Resolution UART/SPI (Binary) 0.06 G/LSB Tilt Angle Output Data Type (*3) Input Range Accuracy guaranteed by specification +/-0.785 rad Null Offset Repeatability T =25C and VCC=3.3V for one year after shipment +/-3 .491 mrad A Resolution UART/SPI (Binary) 0.002 rad/LSB Tilt Angle Speed Output Data Type (*4) Calculating Range Unit per millisecond of measurement trigger +/-2.094 rad/ms Resolution UART/SPI (Binary) 2 (rad/s)/LSB Common Filter Bandwidth (*5) Selectable with command 5,10,20,50,100 Hz UART, Selectable with command Up to 1000 Sps Data Output Rate (*5) SPI, Selectable with command Up to 500 Sps Power Supply Voltage T =25C 3.3 V A Consumption Current Measurement mode, T =25C 20 mA A *1 The range from above 1G to 5G is outside the guaranteed accuracy specifications. 2 *2 The calibrated standard 1G gravitational acceleration value is 9.80665 m/s . *3 Tilt angle is internally calculated from the gravitational acceleration. *4 Tilt angle speed = delta tilt angle / data rate. *5 The output data rate and internal filter bandwidth is selectable by the command. M-A351AS/AU OUTLINE DIMENSIONS Connector Socket in the Device Manufacturer: JST Company Part Number: BM09B-SRSS-TB Recommended Header on the Host Side Manufacturer: JST Company Parts Number: SHR-09V-S-B (housing and knob) SSH-003T-P0.2-H (contact) Outline Dimensions (millimeters) EXAMPLE OF THE MAIN CHARACTERISTIC(NOISE DENSITY) NOTICE: No part of this material may be reproduced or duplicated in any form or by any means without the written permission of Seiko Epson. Seiko Epson reserves the right to make changes to this material without notice. Seiko Epson does not assume any liability of any kind arising out of any inaccuracies contained in this material or due to its application or use in any product or circuit and, further, there is no representation that this material is applicable to products requiring high level reliability, such as, medical products. Moreover, no license to any intellectual property rights is granted by implication or otherwise, and there is no representation or warranty that anything made in accordance with this material will be free from any patent or copyright infringement of a third party. This material or portions thereof may contain technology or the subject relating to strategic products under the control of the Foreign Exchange and Foreign Trade Law of Japan and may require an export license from the Ministry of Economy, Trade and Industry or other approval from another government agency. All brands or product names mentioned herein are trademarks and/or registered trademarks of their respective companies. SEIKO EPSON CORPOPRATION 2018, All rights reserved MSM Business Project First issue Feb.,2016 in Japan 281 Fujimi, Fujimi-machi, Suwa-gun, Nagano-ken 399-0293 JAPAN Modified Mar. 2018 Phone: +81-266-61-0614 FAX: +81-266-61-2051 Rev.20180309