SQ-SI2X-360DA MEMS Inclinometer - Wide Range
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SQ-SI2X-360DA SOLID-STATE WIDE RANGE MEMS INCLINOMETER 360 º X 180 º DUAL AXIS, SERIAL AND ANALOG OUTPUT EXAMPLE OUTPUT The inclinometer module performs calibrated angle measurement with analog voltage and digital serial outputs. The graph below shows an example of the analog output from a device in single axis mode. The device is rotated 720º clockwise from a 0º starting position at a rate of 180º/sec. The output is linear with a piecewise overflow at 360º. The second axis output is similar, but each axis reaches a maximum at 180º and descends back to 0º rather than overflowing. FUNCTION Wide range 360 º x 180 º dual axis angle measurement FEATURES ± 1 º accuracy - differential 0.1 º resolution - digital serial output 2 º resolution - analog output Low temperature drift Factory calibrated angle output High reliability solid-state MEMS Digital filtering for stable measurement Direct PC interface cable APPLICATIONS Platform and vehicle leveling Satellite dish and antenna alignment Machine control and monitoring Angle measurement and recording Computer input, head tracking, and mouse pointing Output Voltage (volts) Angle vs. Output Voltage RANGE AND SCALE PARAMETER THEORY OF OPERATION The inclinometer uses three factory calibrated accelerometers to measure and compute angles made between its axes and the gravity vector. The trigonometric conversions between acceleration and angle are made by an onboard processor. Digital filtering reduces the impact of spurious acceleration and vibration on the reported angle. Scale Factor Offset (0º value) Max (359º value ) Output ( V ) = Offset ( V ) + ScaleFactor ( V/deg ) × Angle (deg) Angle (deg) = Output ( V ) − Offset ( V ) ScaleFactor ( V/deg ) 10 Water St. Lebanon, NH 03766 USA Page 1 of 14 www.signalquest.com info@signalquest.com

SQ-SI2X-360DA SOLID-STATE WIDE RANGE MEMS INCLINOMETER 360 º X 180 º DUAL AXIS, SERIAL AND ANALOG OUTPUT 10 Water St. Lebanon, NH 03766 USA Page 2 of 14 www.signalquest.com info@signalquest.com

SQ-SI2X-360DA SOLID-STATE WIDE RANGE MEMS INCLINOMETER 360 º X 180 º DUAL AXIS, SERIAL AND ANALOG OUTPUT ABSOLUTE MAXIMUM RATINGS PARAMETER Voltage on +Vcc - without regulator - NR option Voltage on +Vcc - with regulator - R option Voltage on any input pin Peak-to-peak supply noise - without regulator -NR option Peak-to-peak supply noise - with regulator - R option Operating temperature Shock survivability Operating vibration NOTES With respect to GND With respect to GND Note: Exposure to conditions outside of the Absolute Maximum Ratings may damage the device. Prolonged exposure to...

SQ-SI2X-360DA SOLID-STATE WIDE RANGE MEMS INCLINOMETER 360 º X 180 º DUAL AXIS, SERIAL AND ANALOG OUTPUT PERFORMANCE PARAMETERS [Test conditions: 3.3v regulator, 25 º C unless otherwise specified] PARAMETER Angle accuracy (differential) - HP option Angle accuracy (differential) - LP option Angle accuracy (differential) - ULP option Angle resolution Alignment accuracy Angle range - Tilt Mode ±1º ±2º ±2º 2 º (analog), 0.1 º (digital) ± 2º 360 º x 180 º (X tilt, Y tilt) Angle range - Gimbaled Mode NOTES From any angle to any other angle within range Dual axis tilt ranges Y rotation valid while...

SQ-SI2X-360DA SOLID-STATE WIDE RANGE MEMS INCLINOMETER 360 º X 180 º DUAL AXIS, SERIAL AND ANALOG OUTPUT PARAMETER – ULP VERSION Update rate - ULP option NOTES Serial output only. Analog output disabled. SIGNAL NAME UART Transmit UART Receive Baud Select +Vcc Supply X Tilt / Y Rotation Output Y Tilt Output Digital Output – UART transmit line. Push-pull (not open collector). If not used, solder to open circuit for mechanical stability. Do not connect to GND or current drain will increase. Digital Input – UART receive line. If not used, solder to V+. Digital Input – HP and LP version only....

Precision Microsensors SOLID-STATE WIDE RANGE MEMS INCLINOMETER 3 60 0 X 180 0 DUAL AXIS, SERIAL AND ANALOG OUTPUT Horizontal Mount Package CHMP Dim2) Side Uieu Side Uieu TT H t H- 9008 no ?0 © SignalQuest, Inc. 10 Water St. Tel: 603.448.6266 www.signalquest.com

SQ-SI2X-360DA SOLID-STATE WIDE RANGE MEMS INCLINOMETER 360 º X 180 º DUAL AXIS, SERIAL AND ANALOG OUTPUT DESIGN, LAYOUT, AND ASSEMBLY CONSIDERATIONS 1. 2. 3. 4. Since the device is a subassembly of surface mount components, it is not suitable for automatic assembly or wave soldering. Hand soldering of pins or SMT pads is specified for 3 seconds at 218 ºC. Pins labeled NC (no connect) should be soldered to open connection pads / pins for mechanical stability. The designer should test the device’s output voltage through its entire desired angle range during prototyping to ensure that it is...

SQ-SI2X-360DA SOLID-STATE WIDE RANGE MEMS INCLINOMETER 360 º X 180 º DUAL AXIS, SERIAL AND ANALOG OUTPUT SERIAL PACKET FORMAT: HP AND LP VERSIONS NOTES X Tilt (high byte) Y Rotation (high byte) Y Tilt (high byte) Y Tilt (high byte) Factory (high byte) GIMBALED MODE TILT MODE Checksum (high) Checksum (high) Format: 16-bit, unsigned integer Output_Value = Measured_Angle × 10. For example, a measured angle of 127.5 º results in an output value of 1275. Format: 16-bit, unsigned integer sum of the 16 bit unsigned integer payload values. The checksum does not include the two sync bytes (0xFE...

SQ-SI2X-360DA SOLID-STATE WIDE RANGE MEMS INCLINOMETER 360 º X 180 º DUAL AXIS, SERIAL AND ANALOG OUTPUT EXAMPLE OUTPUT: HP AND LP VERSIONS* EXAMPLE SUPPLY VOLTAGE +Vcc 3.300 Sensitivity 0.01289 Scale factor 0.00731 Offset value 0.3300 Max value 2.9552 Output Voltage (volts) Angle vs. Output Voltage For supply voltages other than 3.3V see the document “Inclinometer Worksheet” available at http://www.signalquest.com Updated: 2008-09-29 10 Water St. Lebanon, NH 03766 USA Page 9 of 14 www.signalquest.com info@signalquest.com