Motion Sensors - Accelerometers

Part Number	Description / PDF	Quantity
SCA630-EDCV1B-6 TOKO / Murata	ACCELEROMETER 12.8G ANALOG 8SMD	0
MMA8453QR1 NXP Semiconductors	ACCELEROMETER 2-8G I2C 16QFN	0
MMA6255AKEG NXP Semiconductors	SPI 20/20G, 50/50G, 100/100G, ME	38
MMA2244KEGR2 Freescale Semiconductor, Inc. (NXP Semiconductors)	ANALOG CIRCUIT, 1 FUNC, CMOS, PD	0
310A-80	GENERAL INDUSTRIAL VIBRATION SEN	50
793VR Wilcoxon (Amphenol Wilcoxon Sensing Technologies)	ACCEL IEPE SENSOR	0
793-10 Wilcoxon (Amphenol Wilcoxon Sensing Technologies)	ACCEL IEPE SENSOR	0
IIM-42351 TDK InvenSense	COMPACT, LOW POWER 3-AXIS INDUST	9990
SCA2100-D02-1 TOKO / Murata	ACCELEROMETER 2G SPI 12SMD	0
MMA3201KEG NXP Semiconductors	ACCELEROMETER 45G ANALOG 20SOIC	5
KX023-1025-FR ROHM Semiconductor	ACCELEROMETER 2-8G I2C/SPI 16LGA	0
MXC6655XA MEMSIC	DIGITAL THREE-AXIS ACCELEROMETER	0
ADXL316WBCSZ-RL7 Analog Devices, Inc.	ACCELEROMETEREROMETER 16G ANALOG	0
CMCP786T STI Vibration Monitoring	ACCEL&TEMP 100MV/G 10MV/C TOP	50
MMA8225KEGR2 NXP Semiconductors	IC SENSOR ACCEL X-AXIS SOIC16	0
ADXL325BCPZ-RL Analog Devices, Inc.	ACCELEROMETER 5G ANALOG 16LFCSP	0
MMA1260KEG,574 NXP Semiconductors	ANALOG ACCELEROMETER 5V Z 1.5G	0
ADXL325BCPZ-RL7 Analog Devices, Inc.	ACCELEROMETER 5G ANALOG 16LFCSP	2439
MMA6231QR2	MMA6231, PLUS/MINUS 10G DUAL AX	0
ADXL350BCEZ-RL7 Analog Devices, Inc.	ACCELEROMETER 1-8G I2C/SPI 16LGA	0

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