SCA103T

SCA103T Series Data Sheet THE SCA103T DIFFERENTIAL INCLINOMETER SERIES The SCA103T Series is a 3D-MEMS-based single axis inclinometer family that uses the differential measurement principle. The high calibration accuracy combines extremely low temperature dependency, high resolution and low noise together with a robust sensing element design, to make the SCA103T an ideal choice for high accuracy leveling instruments. The VTI inclinometers are insensitive to vibration due to having over damped sensing elements plus they can withstand mechanical shocks of 20000 g. Features • • • • • • • Measuring ranges ±15° SCA103T-D04 and ± 30° SCA103T-D05 0.001° resolution (10 Hz BW, analog output) Sensing element controlled over damped frequency response (-3dB 18Hz) Robust design, high shock durability (20000g) Excellent stability over temperature and time Common mode error and noise reduction using the differential measurement principle Single +5 V supply • • • Ratiometric analog voltage outputs Digital SPI inclination and temperature output Comprehensive failure detection features o True self test by deflecting the sensing elements’ proof mass by electrostatic force. o Continuous sensing element interconnection failure check. o Continuous memory parity check. • RoHS compliant • Compatible with Pb-free reflow solder process Applications • • Platform leveling and stabilization Rotating laser levels • • Leveling instruments Construction levels 12 VDD Sensing element 1 Signal conditioning and filtering A/D conversion 11 OUT_1 10 ST_1 Self test 1 9 ST_2 S elf test 2 EEPROM calibration memory Temperature Sensor SPI interface 1 SCK 3 MISO 4 MOSI 7 CSB Sensing element 2 Signal conditioning and filtering 5 OUT_2 6 GND Figure 1. Functional block diagram VTI Technologies Oy www.vti.fi Subject to changes Doc.Nr. 8261700 1/19 Rev.A SCA103T Series TABLE OF CONTENTS The SCA103T Differential Inclinometer Series .......................................................................1 Features................................................................................................................................................1 Applications .........................................................................................................................................1 Table of Contents .....................................................................................................................2 1 Electrical Specifications .....................................................................................................3 1.1 1.2 1.3 1.4 1.5 1.6 1.7 Absolute Maximum Ratings......................................................................................................3 Performance Characteristics ....................................................................................................3 Electrical Characteristics ..........................................................................................................4 SPI Interface DC Characteristics ..............................................................................................4 SPI Interface AC Characteristics ..............................................................................................4 SPI Interface Timing Specifications .........................................................................................5 Electrical Connection ................................................................................................................6 1.8 Typical Performance Characteristics.......................................................................................6 1.8.1 Additional External Compensation ........................................................................................7 2 Functional Description .......................................................................................................9 2.1 2.2 2.3 2.4 2.5 2.6 2.7 Differential Measurement ..........................................................................................................9 Voltage to Angle Conversion....................................................................................................9 Ratiometric Output ..................................................................................................................10 SPI Serial Interface ..................................................................................................................10 Digital Output to Angle Conversion .......................................................................................13 Self Test and Failure Detection Modes ..................................................................................14 Temperature Measurement .....................................................................................................15 3 Application Information ....................................................................................................16 3.1 3.2 Recommended Circuit Diagrams and Printed Circuit Board Layouts ................................16 Recommended Printed Circuit Board Footprint ...................................................................17 4 Mechanical Specifications and Reflow Soldering ..........................................................17 4.1 4.2 Mechanical Specifications (Reference only) .........................................................................17 Reflow Soldering......................................................................................................................18 5 Document Change Control...............................................................................................19 6 Contact Information ..........................................................................................................19 VTI Technologies Oy www.vti.fi Subject to changes Doc.Nr. 8261700 2/19 Rev.A SCA103T Series 1 Electrical Specifications The SCA103T product family consists of two versions, the SCA103T-D04 and the SCA103T-D05, that differ in measurement range. The specific performance specifications related to each version are listed in the table “SCA103T performance characteristics” below. All other specifications are common to both versions. The supply voltage is Vdd=5.00V and ambient temperature unless otherwise specified. Parameters marked as D are valid when measured in differential mode using an external differential amplifier. Parameters marked with S are for a single measurement channel. The performance of the selected amplifier may have an effect on some parameters. The differential signal is determined as Out_diff = Out1 – Out2. 1.1 Absolute Maximum Ratings Supply voltage (VDD) Voltage at input / output pins Storage temperature Operating temperature Mechanical shock -0.3 V to +5.5V -0.3V to (VDD + 0.3V) -55°C to +125°C -40°C to +125°C Drop from 1 metre onto a concrete surface (20000g). Powered or non-powered 1.2 Performance Characteristics Parameter Measuring range Frequency response Offset (Output at 0g) Offset calibration error Offset Digital Output Sensitivity Sensitivity calibration error Sensitivity Digital Output Offset temperature dependency Sensitivity temperature dependency Typical non-linearity Digital output resolution Output noise density Analog output resolution Cross-axis sensitivity Ratiometric error Long term stability (4 Note 1. Note 2. Note 3. Note 4. D/S D S S S S D S D D D D D D D S S D Condition Nominal –3dB LP (1 Ratiometric output between 0…1° (2 -25…85°C (typical) -40…125°C (max) -25...85°C (typical) -40…125°C (max) Measuring range between 0…1° (2 From DC...100Hz Bandwidth 10 Hz Max. Vdd = 4.75...5.25V (3 SCA103T -D04 ±15 ±0.26 8-28 Vdd/2 ±0.057 1024 16 280 ±0.5 6554 ±0.002 ±0.29 ±0.013 -2.5...+1 ±0.057 12 0.009 0.0004 0.0013 4 ±1