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Document overview
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Technical content
Features
- Dual axis inclination measurement (X and Y)
- Measuring ranges ±30° and ± 90°
- 0.0025° resolution (10 Hz BW, analog output)
- Sensing element controlled over damped frequency response (-3dB 18Hz)
- Robust design, high shock durability (20000g)
- High stability over temperature and time
- Single +5 V supply and unregulated 7…35V supply
- RoHS compliant
Applications
- Platform leveling and stabilization
- 360° vertical orientation measurement
- Leveling instruments
- Construction levels Data Sheet
Murata Electronics Oy Subject to changes 2/5 TABLE OF CONTENTS
Murata Electronics Oy Subject to changes 3/5
1 Electrical Specifications
The SCA121T product family comprises t hree versions, the SCA121T-D03, the SCA121T-D05 and the SCA1 21T-D07 that differs in measurement range and supply voltage. The product version specific performance specifications are listed in the table SCA121 T per formance characteristics below.
1.1 Absolute Maximum Ratings
Supply voltage SCA121T-D05(VDD) Supply voltage SCA121T-D03 and D07 Voltage at input / output pins Storage temperature Operating temperature Mechanical shock Regulated -0.3 V to +5.5V Unregulated -0.3 V to +35V -0.3V to 5.3 -55°C to +125°C -40°C to +125°C Drop from 1 meter onto a concrete surface (20000g). Powered or non-powered
1.2 Performance Characteristics
Parameter Condition SCA121T- D03 SCA121T -D05 SCA121T -D07 Units Measuring range Nominal ±90 ±90 ±30 ±0.5 g Supply Voltage 7…35 5±0.25 7…35 V Offset (Output at 0g) 2.5 Vdd/2 2.5 V Offset calibration error Max deviation ±1.5 ±1.5 ±1.5 ° Sensitivity between 0…1° (1 V/g mV/° Sensitivity calibration error ±1.5 ±1.5 ±1.5 % Offset temperature dependency Sensitivity temperature dependency Typical non-linearity Measuring range ±0.57 ±0.57 ±0.11 ° Frequency response –3dB LP (2 8-28 8-28 8-28 Hz Cross-axis sensitivity Max. 4 4 % Note 1. The angle output has SIN curve relationship to voltage output Note 2. The frequency response is determined by the sensing element’s internal gas damping.
1.3 Electrical Characteristics
1.4 Electrical Connection
2 Functional Description
2.1 Measuring Directions
Figure 1. The measuring directions of the SCA121T
2.2 Voltage to Angle Conversion
V/g for the SCA121T-D07 and 2 V/g for the SCA121T-D03 and SCA121T-D05. shows the angle measurement error if straight line conversion is used.
2.3 Ratiometric Output
automatically compensated for.
3 Mechanical Specifications
3.1 Sensor dimensions
Figure 2. Mechanical dimensions of the SCA121T (Dimensions in mm)