Motion Sensors - Accelerometers

Part Number	Description / PDF	Quantity
IIM-42652 TDK InvenSense	COMPACT, LOW POWER 6-AXIS INDUST	0
805-0500 TE Connectivity Measurement Specialties	ACCELEROMETER 500G IEPE TO5-3	19
MMA8225KEG Freescale Semiconductor, Inc. (NXP Semiconductors)	ANALOG ACCELEROMETER, 12V, X, 25	39
KXR94-2283-FR ROHM Semiconductor	ACCELEROMETER 2G ANALOG 14DFN	889
SCA630-EDCV1B-1 TOKO / Murata	ACCELEROMETER 12.8G ANALOG 8SMD	43
10028S50 ReVibe Energy	RELOG S VIBRATION DATA LOGGER	4
MMA2631NKW Freescale Semiconductor, Inc. (NXP Semiconductors)	DSI2.5 ACCELEROMETER, 12V, X, 31	71
MMA2201KEGR2 NXP Semiconductors	MMA2201KE - MEDIUM-G, ANALOG ACC	1656
731A Wilcoxon (Amphenol Wilcoxon Sensing Technologies)	ACCEL SENSOR	0
ADXL323KCPZ Analog Devices, Inc.	SMALL, LOW POWER, 2 AXIS +/ 3G I	1094
ADXL103CE-REEL Analog Devices, Inc.	PRECISION +/- 1.7 G SINGLE AXIS	15917
SCA3100-D07-1 TOKO / Murata	ACCELEROMETER 6G SPI 12SMD	225
376/CC701HT Wilcoxon (Amphenol Wilcoxon Sensing Technologies)	CBL HT SENSOR & CHG AMP SYS	0
20008458-00 TE Connectivity Measurement Specialties	8911-E WIRELESS ACCELEROMETER	11
MMA8491QR2 NXP Semiconductors	ACCELEROMETER 8G I2C 12QFN	0
ADXL375BCCZ-RL Analog Devices, Inc.	ACCELEROMETER 200G I2C/SPI 14LGA	0
ADXL212AEZ-RL Analog Devices, Inc.	ACCELEROMETER 2G PWM 8LCC	0
ADXL203CE-REEL Analog Devices, Inc.	ACCELEROMETER 1.7G ANALOG 8LCC	49
MMA2301EGR2 Freescale Semiconductor, Inc. (NXP Semiconductors)	ANALOG CIRCUIT, CMOS, PDSO16	132000
AIS326DQTR STMicroelectronics	ACCEL 2-6G I2C/SPI 28QFPN	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