MSA-2G
Ultra-high resolution MEMS accelerometer with ±2g range, 16-bit output, and 150μg/√Hz noise density for precision inclinometers and structural monitoring.
Product Overview
Description
The MSA-2G is an ultra-high resolution MEMS accelerometer optimized for precision static tilt sensing and structural monitoring applications. The ±2g range maximizes resolution for gravity-based measurements.
With 8000 LSB/g sensitivity and ultra-low 150μg/√Hz noise density, this accelerometer delivers exceptional precision for inclinometer and tilt sensing applications. The 16-bit resolution provides fine measurement granularity.
The digital interface and advanced features including programmable bandwidth and temperature compensation ensure accurate measurements across operating conditions. Low power operation enables long-term battery-powered monitoring applications.
Product Series
MSA
Primary Application
High-precision inclinometers
Key Features
- ±2g range for maximum tilt resolution
- 16-bit resolution with 8000 LSB/g sensitivity
- Ultra-low 150μg/√Hz noise density
- Programmable bandwidth 1Hz to 400Hz
- Built-in temperature compensation
- Low power 110μA typical consumption
Specifications
| Measurement Range | ±2g |
|---|---|
| Sensitivity | 8000 LSB/g (16-bit) |
| Noise Density | 150 μg/√Hz |
| Bandwidth | Programmable 1Hz - 400Hz |
| Operating Temperature | -40°C to +85°C |
| Supply Voltage | 1.8V - 3.6V |
| Interface | SPI / I2C |
| Qualification | Industrial Grade |
Applications
High-precision inclinometers
Electronic system design
Structural health monitoring
Electronic system design
Platform leveling systems
Electronic system design
Solar panel tracking
Renewable energy systems
Antenna positioning
Electronic system design
Geotechnical monitoring
Electronic system design
FAE Expert Insights
"The MSA-2G is the ultimate choice for precision static tilt applications. The 8000 LSB/g sensitivity and 150μg/√Hz noise density are exceptional - I've achieved better than 0.05-degree accuracy in precision inclinometer applications. This is the accelerometer I recommend when customers need maximum resolution for structural monitoring or platform leveling. The ±2g range is specifically optimized for gravity-based measurements - any higher range would reduce resolution unnecessarily. The low 110μA power consumption enables year-long battery life in remote monitoring applications. The programmable bandwidth is important - I typically use 10Hz for static applications to minimize noise. For structural monitoring, this accelerometer can detect minute changes in angle that indicate potential structural issues. The temperature compensation maintains accuracy across outdoor temperature ranges. While more expensive than general-purpose accelerometers, the performance justifies the cost for precision applications."
Ultimate precision with 8000 LSB/g sensitivity for high-accuracy inclinometers
— David Chen, BeiLuo
Frequently Asked Questions
What is the minimum detectable tilt angle with the MSA-2G?
The MSA-2G can detect tilt changes as small as 0.01 degrees (10 milli-degrees) under ideal conditions: 1) Theoretical resolution: 1 LSB = 0.007 degrees (8000 LSB/g, 1g = 90 degrees); 2) Noise-limited resolution: approximately 0.01-0.02 degrees with 150μg/√Hz noise density at 10Hz bandwidth; 3) Practical accuracy: 0.03-0.05 degrees with proper calibration. This exceptional resolution enables detection of subtle structural movements. For comparison, typical consumer accelerometers achieve 0.1-0.5 degree accuracy. The MSA-2G is suitable for applications requiring detection of minute angular changes such as structural monitoring, precision leveling, and geotechnical applications.
Expect 0.01-0.05 degree resolution depending on bandwidth and calibration. Use lowest bandwidth for maximum resolution.
Why is the ±2g range optimal for tilt sensing?
The ±2g range is optimal for tilt sensing because: 1) Gravity is 1g - a ±2g range provides 100% headroom above maximum expected acceleration; 2) Higher resolution - dividing the ADC range over 2g instead of 16g or 100g provides 8x or 50x better resolution; 3) Better signal-to-noise ratio - the sensor is optimized for low-g operation; 4) No loss of range - static tilt only uses ±1g (gravity component), so ±2g covers all tilt angles. For pure tilt sensing applications, any range beyond ±2g reduces resolution without benefit. The only reason to use higher range is if the application also experiences dynamic acceleration beyond ±2g (vibration, motion). For static inclinometers, the MSA-2G provides optimal performance.
±2g is optimal for pure tilt sensing. Use higher range only if your application experiences dynamic acceleration beyond ±2g.
How do I calibrate for maximum accuracy?
For maximum accuracy with the MSA-2G, implement comprehensive calibration: 1) Offset calibration - measure output at known orientations (0°, 90°, 180°, 270°) and calculate average offset; 2) Sensitivity calibration - use gravity as reference (1g = 9.80665 m/s²); 3) Temperature calibration - characterize offset and sensitivity drift across temperature range; 4) Cross-axis calibration - measure and compensate for axis misalignment; 5) Non-linearity correction - apply polynomial correction if needed. Calibration procedure: 1) Place sensor at 0° (horizontal), record X and Z; 2) Rotate 90°, record values; 3) Continue for 180°, 270°; 4) Calculate calibration coefficients; 5) Apply in software. With full calibration, achieve 0.03-0.05° accuracy. Document calibration procedure for production.
Implement offset, sensitivity, and temperature calibration for best accuracy. Cross-axis calibration for precision applications.
What applications benefit most from the MSA-2G?
Applications that benefit most from MSA-2G's ultra-high resolution: 1) Structural health monitoring - detect subtle building/bridge movements indicating potential issues; 2) Precision inclinometers - high-accuracy angle measurement for industrial applications; 3) Platform leveling - precision leveling for semiconductor equipment, machine tools; 4) Solar panel tracking - accurate sun position tracking for maximum energy collection; 5) Antenna positioning - precise satellite dish or radar antenna alignment; 6) Geotechnical monitoring - landslide detection, ground subsidence monitoring. These applications require detection of small angular changes (0.01-0.1 degrees) that general-purpose accelerometers cannot resolve. The MSA-2G's 8000 LSB/g sensitivity makes these measurements possible.
Use MSA-2G for applications requiring <0.1 degree accuracy. General-purpose accelerometers are sufficient for less demanding tilt applications.
How does temperature affect long-term accuracy?
Temperature affects the MSA-2G's accuracy through: 1) Offset drift - zero-g output changes with temperature (typically <5mg/°C); 2) Sensitivity drift - scale factor changes (typically <0.01%/°C); 3) The built-in temperature compensation reduces these effects by 80-90%. For long-term accuracy: 1) Implement temperature compensation using the built-in temperature sensor; 2) Characterize your specific unit across temperature range; 3) Apply calibration coefficients in software; 4) For extreme precision, maintain constant temperature or implement active compensation. Over -40°C to +85°C range, uncompensated error could be ±0.5°, while with compensation achieves ±0.05°. For outdoor structural monitoring, temperature compensation is essential for accurate long-term measurements.
Implement temperature compensation for outdoor or varying temperature applications. Built-in compensation reduces drift by 80-90%.