Datasheet

ManualsBrandsMURATA ManualsSensorsClinometer Reading range: -90 - +90 ° Solder pins

SCA100T Series

VTI Technologies Oy Subject to changes 1/18

www.vti.fi Doc.Nr. 8261800 Rev.A

Self test 2

Sensing

element 1

Sensing

element 2

SPI interface

Self test 1

Signal conditioning

and filtering

A/D conversion

Signal conditioning

and filtering

EEPROM

calibration

memory

9 ST_2

10 ST_1

12 VDD

6 GND

11 OUT_1

5 OUT_2

1 SCK

3 MISO

4 MOSI

7 CSB

Temperature

Sensor

THE SCA100T DUAL AXIS INCLINOMETER SERIES

The SCA100T Series is a 3D-MEMS-based dual axis inclinometer family that provides instrumentation grade

performance for leveling applications. The measuring axes of the sensing elements are parallel to the mounting

plane and orthogonal to each other. Low temperature dependency, high resolution and low noise, together a with

robust sensing element design, make the SCA100T the ideal choice for leveling instruments. The VTI

inclinometers are insensitive to vibration, due to their over damped sensing elements, and can withstand

mechanical shocks of up to 20000 g.

Features

• Dual axis inclination measurement (X and Y)

• Measuring ranges ±30° SCA100T-D01 and

± 90° SCA100T-D02

• 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

• 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

• 360° vertical orientation measurement

• Leveling instruments

• Construction levels

Figure 1. Functional block diagram

Data Sheet

Summary of content (18 pages)

PAGE 1
SCA100T Series Data Sheet THE SCA100T DUAL AXIS INCLINOMETER SERIES The SCA100T Series is a 3D-MEMS-based dual axis inclinometer family that provides instrumentation grade performance for leveling applications. The measuring axes of the sensing elements are parallel to the mounting plane and orthogonal to each other. Low temperature dependency, high resolution and low noise, together a with robust sensing element design, make the SCA100T the ideal choice for leveling instruments.
PAGE 2
SCA100T Series TABLE OF CONTENTS The SCA100T Dual Axis Inclinometer Series .........................................................................1 Features................................................................................................................................................1 Applications .........................................................................................................................................1 Table of Contents ....................................
PAGE 3
SCA100T Series 1 Electrical Specifications The SCA100T product family comprises two versions, the SCA100T-D01 and the SCA100T-D02 that differ in measurement range. The product version specific performance specifications are listed in the table SCA100T performance characteristics below. All other specifications are common with both versions. Vdd=5.00V and ambient temperature unless otherwise specified. 1.
PAGE 4
SCA100T Series 1.3 Electrical Characteristics Parameter Supply voltage Vdd Current consumption Operating temperature Analog resistive output load Analog capacitive output load Start-up delay 1.4 Min. Typ Max. Units 4.75 5.0 4 5.25 5 V mA +125 °C Vdd = 5 V; No load -40 Vout to Vdd or GND 10 kOhm Vout to Vdd or GND 20 nF Reset and parity check 10 ms SPI Interface DC Characteristics Parameter Conditions Symbol Min Typ Max Unit VIN = 0 V IPU VIH VIL VHYST CIN 13 4 -0.
PAGE 5
SCA100T Series 1.6 SPI Interface Timing Specifications Parameter Terminal CSB, SCK Time from CSB (10%) to SCK (90%) Time from SCK (10%) to CSB (90%) Terminal SCK SCK low time Conditions Symbol Min.
PAGE 6
SCA100T Series 1.7 Electrical Connection If the SPI interface is not used SCK (pin1), MISO (pin3), MOSI (pin4) and CSB (pin7) must be left floating. Self-test can be activated applying logic “1” (positive supply voltage level) to ST_1 or ST_2 pins (pins 10 or 9). Self-test must not be activated for both channels at the same time. If ST feature is not used pins 9 and 10 must be left floating or connected to GND. Inclination signals are provided from pins OUT_1 and OUT_2.
PAGE 7
SCA100T Series Temperature dependency of SCA100T offset 1 specification limit 0.8 offset error [degrees] 0.6 0.4 0.2 Average +3 sigma 0 -3 sigma -0.2 -0.4 -0.6 -0.8 specification limit -1 -40 -20 0 20 40 60 80 100 120 Temp [°C] Figure 4. Typical temperature dependency of SCA100T offset Temperature dependency of SCA100T sensitivity specification limit 1.00 sensitivity error [%] 0.50 0.00 Average -0.50 +3 sigma -1.00 -3 sigma -1.50 -2.00 -2.
PAGE 8
SCA100T Series The equation of fitted 2nd order polynome curve for sensitivity compensation is: Scorr = −0.00011* T 2 + 0.0022 * T + 0.
PAGE 9
SCA100T Series 2 2.1 Functional Description Measuring Directions X-axis Y-axis VOUT > VOUT =2.5V > VOUT Figure 8. The measuring directions of the SCA100T 2.2 Voltage to Angle Conversion Analog output can be transferred to angle using the following equation for conversion: ⎛ Vout − Offset ⎞ ⎟⎟ ⎝ Sensitivity ⎠ α = arcsin⎜⎜ where: Offset = output of the device at 0° inclination position, Sensitivity is the sensitivity of the device and VDout is the output of the SCA100T. The nominal offset is 2.
PAGE 10
SCA100T Series 2.3 Ratiometric Output Ratiometric output means that the zero offset point and sensitivity of the sensor are proportional to the supply voltage. If the SCA100T supply voltage is fluctuating the SCA100T output will also vary. When the same reference voltage for both the SCA100T sensor and the measuring part (A/Dconverter) is used, the error caused by reference voltage variation is automatically compensated for. 2.
PAGE 11
SCA100T Series • • • • • • • • each bit is sampled on the rising edge of SCK (MOSI line) after the device is selected with the falling edge of CSB, an 8-bit command is received. The command defines the operations to be performed the rising edge of CSB ends all data transfer and resets internal counter and command register if an invalid command is received, no data is shifted into the chip and the MISO remains in high impedance state until the falling edge of CSB.
PAGE 12
SCA100T Series sensor element electrode. This causes the electrostatic force that deflects the beam of the sensing element and simulates the acceleration to the positive direction. The self-test is de-activated by giving the MEAS command. The self test function must not be activated for both channels at the same time. Self test for Y-channel (STY) activates the self test function for the Y-channel (Channel 2).
PAGE 13
SCA100T Series As an example following table contains data register values and calculated differential digital output values with -5, -1 0, 1 and 5 degree tilt angles. 2.6 Angle [°] -5 Acceleration [mg] -87.16 -1 -17.45 0 0 1 17.45 5 87.
PAGE 14
SCA100T Series ST pin voltage 5V 0V 5V V1 Vout V2 V3 T3 T2 T1 0V T4 T5 Self test wave forms Figure 12. V1 = initial output voltage before the self test function is activated. V2 = output voltage during the self test function. V3 = output voltage after the self test function has been de-activated and after stabilization time Please note that the error band specified for V3 is to guarantee that the output is within 5% of the initial value after the specified stabilization time.
PAGE 15
SCA100T Series 3 3.1 Application Information Recommended Circuit Diagrams and Printed Circuit Board Layouts The SCA100T should be powered from a well regulated 5 V DC power supply. Coupling of digital noise to the power supply line should be minimized. 100nF filtering capacitor between VDD pin 12 and GND plane must be used. The SCA100T has a ratiometric output. To get the best performance use the same reference voltage for both the SCA100T and Analog/Digital converter. Use low pass RC filters with 5.
PAGE 16
SCA100T Series 3.2 Recommended Printed Circuit Board Footprint Figure 15. 4 4.1 Recommended PCB footprint Mechanical Specifications and Reflow Soldering Mechanical Specifications (Reference only) Lead frame material: Plating: Solderability: RoHS compliance: Co-planarity error The part weights Copper Nickel followed by Gold JEDEC standard: JESD22-B102-C RoHS compliant lead free component. 0.1mm max. <1.2 g Figure 16. Mechanical dimensions of the SCA100T (Dimensions in mm) VTI Technologies Oy www.
PAGE 17
SCA100T Series 4.2 Reflow Soldering The SCA100T is suitable for Sn-Pb eutectic and Pb- free soldering process and mounting with normal SMD pick-and-place equipment. Figure 17. Recommended SCA100T body temperature profile during reflow soldering. Ref. IPC/JEDEC J-STD-020B. Profile feature Sn-Pb Eutectic Assembly Average ramp-up rate (TL to TP) Pb-free Assembly 3°C/second max. 3°C/second max.
PAGE 18
SCA100T Series 5 6 Document Change Control Version Date Change Description A 1.9.-06 Initial release Contact Information Finland (head office) VTI Technologies Oy P.O. Box 27 Myllynkivenkuja 6 FI-01621 Vantaa Finland Tel. +358 9 879 181 Fax +358 9 8791 8791 E-mail: sales@vti.fi Germany VTI Technologies Oy Branch Office Frankfurt Rennbahnstrasse 72-74 D-60528 Frankfurt am Main, Germany Tel. +49 69 6786 880 Fax +49 69 6786 8829 E-mail: sales.de@vti.fi USA VTI Technologies, Inc. One Park Lane Blvd.