Motion Sensors - Accelerometers

Part Number	Description / PDF	Quantity
CMCP788T STI Vibration Monitoring	PREMIUM ACCEL & TEMP TOP EXIT	50
MMA6555KCWR2 NXP Semiconductors	ACCELEROMETER 105G SPI 16QFN	0
MMA5112KWR2 Freescale Semiconductor, Inc. (NXP Semiconductors)	XTINSIC, PSI5 INERTIAL SENSOR, 1	10000
MMA621010AEG Freescale Semiconductor, Inc. (NXP Semiconductors)	ANALOG CIRCUIT, 1 FUNC, PDSO20	0
CMCP783A STI Vibration Monitoring	ECONOMICAL ACCEL, 100 MV/G SIDE	100
ADIS16220CCCZ Analog Devices, Inc.	DIGITAL VIBRATION SENSOR	417
832M1-0200 TE Connectivity Measurement Specialties	ACCELEROMETER 200G IEPE SMD	11
993A Wilcoxon (Amphenol Wilcoxon Sensing Technologies)	CBL TRIAXIAL ACCEL 6'	0
ADXL316WBCSZ-RL Analog Devices, Inc.	ACCELEROMETEREROMETER 16G ANALOG	0
ADXL213AE-REEL Analog Devices, Inc.	ACCELEROMETER 1.2G PWM 8LCC	2697
MMA1250EGR2 Freescale Semiconductor, Inc. (NXP Semiconductors)	ANALOG CIRCUIT, CMOS, PDSO16	3000
799M Wilcoxon (Amphenol Wilcoxon Sensing Technologies)	ACCEL IEPE SENSOR	0
BMA253 Bosch Sensortec	ACCEL 2-16G I2C/SPI 12LGA	0
CMCP787T STI Vibration Monitoring	PREMIUM ACCEL & TEMP SIDE EXIT	50
ADXL357BEZ Analog Devices, Inc.	ACCEL 10-40G I2C/SPI 14CLCC	162
797L Wilcoxon (Amphenol Wilcoxon Sensing Technologies)	ACCEL IEPE SENSOR	0
CMCP787T-M8 STI Vibration Monitoring	PREMIUM ACCEL & TEMP SIDE M8	50
PR49-24J National Control Devices	ACTIVITY DETECTION SENSOR	5
MMA6222AKEGR2 NXP Semiconductors	ACCELEROMETER 20G ANALOG 20SOIC	0
ADXL212AEZ Analog Devices, Inc.	ACCELEROMETER 2G PWM 8LCC	180

Motion Sensors - Accelerometers

1. Overview

Accelerometers are motion sensors that measure acceleration forces (static or dynamic) along one or multiple axes. These devices convert mechanical motion into electrical signals, enabling quantitative analysis of vibration, tilt, shock, and dynamic movement. As core components in modern sensing systems, accelerometers play critical roles in consumer electronics, industrial automation, automotive safety systems, and aerospace navigation.

2. Main Types and Functional Classification

Type	Functional Characteristics	Application Examples
Capacitive MEMS	High sensitivity, low power consumption, digital output	Smartphones, wearable devices
Piezoelectric	Self-powered, excellent frequency response	Vibration analysis, impact detection
Piezoresistive	High shock tolerance, analog output	Automotive crash testing, industrial monitoring
Servo (Force-Balance)	Ultra-high precision, low noise	Inertial navigation, seismic monitoring
Optical MEMS	Immune to electromagnetic interference	High-precision scientific instruments

3. Structure and Components

Typical accelerometers consist of: - Seismic mass with specific inertial properties - Elastic suspension elements (springs or beams) - Displacement detection circuit (capacitive, piezoelectric, or resistive) - Temperature compensation circuitry - Signal conditioning electronics - Protective housing (metal/ceramic/polymer) Modern MEMS devices integrate microstructures on silicon substrates with digital interfaces (I2C/SPI).

4. Key Technical Specifications

Parameter	Description	Importance
Measurement Range	2g to 500g	Determines application suitability
Resolution	0.1mg to 10mg	Impacts measurement precision
Frequency Response	DC to 10kHz	Affects dynamic signal capture
Nonlinearity	0.1% to 1% FS	Measurement accuracy indicator
Temperature Range	-40 C to +150 C	Environmental reliability
Power Consumption	5 A to 10mA	Battery life consideration

5. Application Fields

Consumer Electronics: Smartphones (screen rotation), gaming controllers
Automotive: Airbag deployment, electronic stability control (ESC)
Industrial: Predictive maintenance systems, vibration monitoring
Healthcare: Fall detection devices, rehabilitation equipment
Aerospace: Flight control systems, structural health monitoring
Case Study: iPhone's ADXL345 MEMS accelerometer enables step counting and orientation detection

6. Leading Manufacturers

Manufacturer	Representative Product	Key Features
Analog Devices	ADXL345	3-axis, 13-bit resolution, I2C interface
STMicroelectronics	LSM6DSO	6-axis IMU, AI-enabled edge computing
Bosch Sensortec	BMI270	Low-power wearable sensor, 16Hz noise
TE Connectivity	KX134-1211	400g high-shock measurement
Honeywell	QA-750	Tactical-grade servo accelerometer

7. Selection Guidelines

Determine required measurement axes (1D/2D/3D)
Match range/sensitivity with application requirements
Assess environmental conditions (temperature, vibration)
Select appropriate output interface (analog/digital)
Evaluate power consumption constraints
Consider calibration requirements and long-term stability

8. Industry Trends

Key development directions include: - MEMS technology advancement towards atomic-scale sensitivity - Integration with gyroscopes and AI processing (smart sensors) - Wireless sensor network compatibility - Increased adoption in autonomous vehicles and IoT edge devices - Development of ultra-low-power wake-up accelerometers - Fiber optic accelerometer systems for aerospace applications - Enhanced shock survivability for industrial harsh environments