Motion Sensors - Accelerometers

Part Number	Description / PDF	Quantity
993B-7-33 Wilcoxon (Amphenol Wilcoxon Sensing Technologies)	CBL TRIAXIAL ACCEL 16'	0
MXR7900CF MEMSIC	ACCELEROMETER 1G ANALOG 8QFN	0
IIS2ICLXTR STMicroelectronics	2-AXIS ACCELEROMETER FOR INDUSTR	1804
MMA2202KEGR2,518 NXP Semiconductors	ANALOG CIRCUIT, 1 FUNC, CMOS, PD	955
ADXL312ACPZ Analog Devices, Inc.	ACCEL 1.5-12G I2C/SPI 32LFCSP	2309
KXCJ9-1008-FR ROHM Semiconductor	ACCELEROMETER 2-8G I2C 10LGA	337
MMA6263QR2 Freescale Semiconductor, Inc. (NXP Semiconductors)	PLUS/MINUS 1.5G DUAL AXIS MICROM	900
KXTF9-2050-FR ROHM Semiconductor	ACCELEROMETER 2-8G I2C 10LGA	5297
MMA6341LT Freescale Semiconductor, Inc. (NXP Semiconductors)	MMA6341, +/-3G, +/-9G TWO AXIS	0
832M1-0050 TE Connectivity Measurement Specialties	ACCELEROMETER 50G IEPE SMD	0
ADXL362BCCZ-MI-RL Analog Devices, Inc.	ACCELEROMETER 2-8G SPI 16LGA	0
H3LIS331DLTR STMicroelectronics	ACCEL 100-400G I2C/SPI 16TFLGA	2647
ADXL354BEZ Analog Devices, Inc.	ACCELEROMETER 2-4G ANALOG 14CLCC	0
KX112-1042-SR ROHM Semiconductor	ACCELEROMETER 2-8G I2C/SPI 12LGA	0
ADXL354CEZ-RL7 Analog Devices, Inc.	ACCELEROMETER 2-8G ANALOG 14CLCC	0
MMA3221KEG NXP Semiconductors	ACCEL 50G/20G ANALOG 20SOIC	71
IIS2DLPCTR STMicroelectronics	ACCEL 2-16G I2C/SPI 12LGA	0
ADXL202AQC Analog Devices, Inc.	DUAL-AXIS IMEMS ACCELEROMETER	80
MMA6825BKCWR2 NXP Semiconductors	ACCELEROMETER 100G SPI 16QFN	0
ADXL700WBRWZ Analog Devices, Inc.	ACCELEROMETER 14.2G SPI 16SOIC	27

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