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1 Sensor and Actuator Slides Seth Young Mecatronics March 2006.

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Presentation on theme: "1 Sensor and Actuator Slides Seth Young Mecatronics March 2006."— Presentation transcript:

1 1 Sensor and Actuator Slides Seth Young Mecatronics March 2006

2 2 Sensor: MS5534A Digital Barometer Seth Young Mecatronics March 2006

3 USU 3/16 Highlights Integrated pressure sensor Pressure range mbar 15 Bit ADC 6 coefficients for a software

4 USU 4/16 Highlights (cont.) compensation stored on-chip 3-wire serial interface 1 system clock line ( kHz) Low voltage / low power

5 USU 5/16 Applications Mobile altimeter/barometer system Weather control systems Adventure or multi-mode watches GPS Receivers

6 USU 6/16 Block Diagram

7 USU 7/16 Operation Overview Altitude measurement based on barometric pressure is a function of temperature The MS5534A Digital Barometer senses both pressure and temperature Both pressure and temperature outputs are converted from analog to digital on-chip

8 USU 8/16 Operation Overview (cont.) Outputs:  Pressure: 16 bit number “D1”  Temperature: 16 bit number “D2” Each sensor is factory calibrated at two pressures and temperatures. This gives two constants. Pressure, Temperature, and the constants are used off-chip to calculate the altitude

9 USU 9/16 Pin Configuration

10 USU 10/16 Maximum Ratings Supply voltage—min: -0.3 V, max: 4 V Overpressure—max: 10 bar Storage Temperature—min: -20, max: +70 C

11 USU 11/16 Recommended Operating Conditions

12 USU 12/16 Typical Performance Curves

13 USU 13/16 Typical Performance Curves (cont.)

14 USU 14/16 Typical Performance Curves (cont.)

15 USU 15/16 Altitude readout steps 1. Word 1 to Word 4 are read out of the serial interface. 2. Compensation coefficients C1 to C6 are extracted through the serial interface. 3. Then the 16 bit pressure and 16 bit temperature numbers can be read out in a loop. 4. Altitude is calculated from pressure, temperature, and the constants off-chip.

16 USU 16/16 Operation Flow Diagram

17 USU 17/16 Operation Flow Diagram (cont.)

18 USU 18/16 Operation Flow Diagram (cont.)

19 USU 19/16 Arrangement of calibration data in word1 to word4

20 USU 20/16 Method for compensating for non- linearity

21 USU 21/16 Serial interface The altimeter communicates with the rest of the system via a 3 wire serial interface SCLK (serial clock) initiates that data transfer Bits are sampled and sent on the rising edge of SCLK Transactions are initiated by a code sent to the altimeter on the DIN line Responses are sent back on the DOUT line

22 USU 22/16 Accusition sequence for D1 & D2

23 USU 23/16 Acquisition sequence for word 1 & 2

24 USU 24/16 Reset sequence

25 USU 25/16 Application example: an altimeter

26 USU 26/16 Package size

27 USU 27/16 PCB board mounting

28 28 Actuator: SQL Series Linear Motors Seth Young Mecatronics March 2006

29 USU 29/16 Features: Piezoelectric motor Scalable to millimeters in size Simple construction for high-volume, low-cost manufacturing Direct linear movement

30 USU 30/16 Features (cont.): Robust construction to withstand high shock loads Sub-micrometer precision Silent, ultrasonic operation Wide operating temperature range

31 USU 31/16 Overview SQL series linear SQUIGGLE motors are very small and have low power requirements. Because of this they are great for medical devices that are portable. They can withstand high shock. They also offer sub- micrometer precision and can supply up to four Newtons of force.

32 USU 32/16 Overview (cont.)

33 USU 33/16 Advantages of the Squiggle motor Electromagnetic motors have reached the limit of minimization In EM motors, more power is converted to heat than motion in motors smaller than 6mm There is less torque to overcome friction in the micro-gears

34 USU 34/16 Advantages of the Squiggle motor Squiggle motor gives greater efficiency for power Higher reliability Ten times better precision than EM motors

35 USU 35/16 Ultrasonic driver

36 USU 36/16 Design Fundamentally threaded nut and screw Two-phase sinusoidal drive signals cause piezoelectric actuators to vibrate the nut at fixed resonate frequency Because it’s ultrasonic it’s very quiet

37 USU 37/16 Design (cont.) The nut vibrates in a “hula hoop” motion The screw translation is bidirectional and the position of the tip of the screw is precisely controlled by the driver A position sensor is required to achieve repeatable steps.

38 USU 38/16 Design (cont.) The vibration stops at zero power and the threads hold position with very high stability and stiffness. Battery power is preserved because the screws stay in position without continuous power.

39 USU 39/16 Squiggle motor

40 USU 40/16 Squiggle 3.4 mm x 10 mm standard evaluation model

41 USU 41/16 Squiggle 3.4 mm x 10 mm

42 USU 42/16 Squiggle 3.4 mm x 10 mm

43 USU 43/16 Squiggle 3.4 mm x 10 mm

44 USU 44/16 SQUIGGLE 2.4 mm x 10 mm Standard evaluation model

45 USU 45/16 SQUIGGLE 2.4 mm x 10 mm

46 USU 46/16 SQUIGGLE 2.4 mm x 10 mm

47 USU 47/16 SQUIGGLE 2.4 mm x 10 mm

48 USU 48/16 MC-1000 Resonant Drive Board and HS-1000 Handset Drive board demonstrates a circuit that can be put onto an ASIC Operates a single SQL motor and can be controlled by a handset Uses a Microchip dsPIC30F3010 microprocessor at 20 MIPS

49 USU 49/16 MC-1000 Resonant Drive Board and HS-1000 Handset

50 USU 50/16 MC-1000 Resonant Drive Board and HS-1000 Handset


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