Motion Sensors - Accelerometers

Part Number	Description / PDF	Quantity
MMA7360LR2 Freescale Semiconductor, Inc. (NXP Semiconductors)	MMA7360, THREE AXIS LOW-G MICRO	48516
MMA6263Q Freescale Semiconductor, Inc. (NXP Semiconductors)	MMA6263, PLUS/MINUS 1.5G DUAL A	18
MMA2612KW Freescale Semiconductor, Inc. (NXP Semiconductors)	DSI2.5 ACCELEROMETER, 12V, X, 12	70
MMA1725W Freescale Semiconductor, Inc. (NXP Semiconductors)	DSI3 ACCELEROMETER, QFN 16	65
MMA2244KEGR2 Freescale Semiconductor, Inc. (NXP Semiconductors)	ANALOG CIRCUIT, 1 FUNC, CMOS, PD	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
MMA1250EGR2 Freescale Semiconductor, Inc. (NXP Semiconductors)	ANALOG CIRCUIT, CMOS, PDSO16	3000
MMA6263QR2 Freescale Semiconductor, Inc. (NXP Semiconductors)	PLUS/MINUS 1.5G DUAL AXIS MICROM	900
MMA6341LT Freescale Semiconductor, Inc. (NXP Semiconductors)	MMA6341, +/-3G, +/-9G TWO AXIS	0
MMA8225KEG Freescale Semiconductor, Inc. (NXP Semiconductors)	ANALOG ACCELEROMETER, 12V, X, 25	39
MMA2631NKW Freescale Semiconductor, Inc. (NXP Semiconductors)	DSI2.5 ACCELEROMETER, 12V, X, 31	71
MMA2301EGR2 Freescale Semiconductor, Inc. (NXP Semiconductors)	ANALOG CIRCUIT, CMOS, PDSO16	132000
MMA2204KEGR2 Freescale Semiconductor, Inc. (NXP Semiconductors)	MICROMACHINED ACCELEROMETER, CMO	6803
MMA2204EGR2 Freescale Semiconductor, Inc. (NXP Semiconductors)	ANALOG CIRCUIT, CMOS, PDSO16	33378
MMA8205TEGR2 Freescale Semiconductor, Inc. (NXP Semiconductors)	DIGITAL X-AXIS ACCELEROMETER	5000
MMA5112KW Freescale Semiconductor, Inc. (NXP Semiconductors)	PSI5 ACCELEROMETER, Z, 120G, QFN	44
MMA6231Q Freescale Semiconductor, Inc. (NXP Semiconductors)	MMA6231, PLUS/MINUS 10G DUAL AX	0
MMA5212AKW Freescale Semiconductor, Inc. (NXP Semiconductors)	PSI5 ACCELEROMETER, 12V, X, 120G	75
MMA9550LR1-FR Freescale Semiconductor, Inc. (NXP Semiconductors)	INTELLIGENT MOTION SENSING PLATF	24603

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