Single-Axis, High-g, iMEMS® Accelerometers# ADXL193 ±250g Accelerometer Technical Documentation
*Manufacturer: Analog Devices Inc. (ADI)*
## 1. Application Scenarios
### Typical Use Cases
The ADXL193 is a high-g, single-axis MEMS accelerometer designed for demanding industrial and automotive applications requiring measurement of high-level accelerations up to ±250g. Typical use cases include:
Shock and Impact Monitoring
- Drop testing and impact detection in consumer electronics
- Crash detection systems in automotive safety applications
- Structural health monitoring for industrial equipment
Vibration Analysis in Harsh Environments
- Heavy machinery condition monitoring
- Industrial robot arm motion sensing
- Construction equipment performance analysis
High-G Motion Sensing
- Sports analytics for high-impact activities
- Aerospace testing and qualification
- Military equipment ruggedness verification
### Industry Applications
Automotive Sector
- Crash detection and airbag deployment systems
- Vehicle black box data recording
- Anti-theft and intrusion detection systems
- Suspension and chassis monitoring
Industrial Automation
- Predictive maintenance systems for rotating machinery
- Industrial robot collision detection
- Conveyor system monitoring
- Heavy equipment operational monitoring
Consumer Electronics
- Ruggedized device impact recording
- Sports equipment performance tracking
- Gaming controller motion sensing (high-intensity applications)
Aerospace and Defense
- Munitions testing and monitoring
- Aircraft structural health monitoring
- Satellite deployment shock recording
### Practical Advantages and Limitations
Advantages:
- Wide Dynamic Range : Capable of measuring accelerations from 0 to ±250g
- High Shock Survivability : Withstands shocks up to 10,000g
- Low Power Consumption : Typically 1.8mA at 5V supply
- Temperature Stability : Excellent performance across -40°C to +125°C
- Small Form Factor : 5mm × 5mm × 2mm LFCSP package
Limitations:
- Single-Axis Measurement : Limited to X-axis sensing only
- Limited Resolution : 12mg/LSB may be insufficient for low-g applications
- Analog Output : Requires external ADC for digital systems
- Bandwidth Constraints : 5kHz bandwidth may limit high-frequency applications
## 2. Design Considerations
### Common Design Pitfalls and Solutions
Power Supply Noise
- *Pitfall*: Noisy power supplies causing signal integrity issues
- *Solution*: Implement proper decoupling with 0.1μF ceramic capacitor placed close to VDD pin
Signal Conditioning Errors
- *Pitfall*: Inadequate filtering leading to aliasing and noise
- *Solution*: Use anti-aliasing filters matched to application bandwidth requirements
Mechanical Mounting Issues
- *Pitfall*: Improper PCB mounting affecting measurement accuracy
- *Solution*: Ensure rigid mechanical coupling between sensor and measured structure
Temperature Compensation
- *Pitfall*: Ignoring temperature effects on offset and sensitivity
- *Solution*: Implement temperature compensation algorithms or use internal temperature sensor
### Compatibility Issues with Other Components
ADC Interface Considerations
- Ensure ADC input range matches the ADXL193 output swing (0.5V to 4.5V typical)
- Match sampling rate to sensor bandwidth (up to 10kHz recommended)
Microcontroller Integration
- Verify microcontroller ADC resolution meets application requirements
- Ensure sufficient processing capability for real-time data analysis
Power Management
- Compatible with 5V systems; requires level shifting for 3.3V microcontrollers
- Consider power sequencing requirements in multi-voltage systems
### PCB Layout Recommendations
Component Placement
- Place decoupling capacitor within 5mm of VDD pin
- Position filter components close to output pin
- Minimize trace length between sensor and signal conditioning circuitry
Routing Guidelines
- Use ground
