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Peripherals and their Control An overview of industrially available “peripheral devices”

Peripherals and their Control An overview of industrially available “peripheral devices”. Some ideas for Laboratories and Quiz / Exam questions. To be tackled today. Analog Output Devices

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Peripherals and their Control An overview of industrially available “peripheral devices”

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  1. Peripherals and their ControlAn overview of industrially available “peripheral devices” Some ideas for Laboratories and Quiz / Exam questions

  2. To be tackled today • Analog Output Devices • These could be handled via A/D as we did with an audio signal in Lab. 1. Depends on amplitude and frequency of the signals generated by the devices. • SPI devices – Tackled in Lab. 4 • LCD screen using a serial parallel converter • MC33993 Multiple -- Switch Detection Interface • ADIS16003 accelerometer and temperature sensor • Digital Output – modulated pulse width • Handle with PF interface as with switches • TSL230R – Light sensor – Lab. 2 • ADI - TMP03 thermometer – Lab. 3 • ADXL213 Dual Axis Accelerometer – Done in lecture • Those interested – might be able to work out special Lab. 3 substitute – Four times the fun – eight times the work?

  3. MMA6260QDual Axis Accelerometer – Analog Output Left Channel ? Right Channel? • Could we modify the “Talk-through program from Lab. 1 to work withthis accelerometer? • Concern 1 – voltage levels – too high voltages would destroy Blackfin A/D • Concern 2 – is the 48 kHz bandwidth of the audio A/D enough • Probable solution – use a non-audio, more general A/D connected via SPI interface

  4. MMA6260Q • How doesit work?

  5. MMA6260Q Dual Axis AccelerometerUsed as “tilt” sensor – static mode

  6. MXPM2010 – Pressure sensor Differential pairoutput How connect to Blackfin A/D which can’thandle differential voltages? Convert tosingle sided signalvia op-ampand then connect?

  7. 33794 – Electric Field Sensor-- Uses ISO-9141 dual-wire protocol

  8. ISO-9141 • Road vehicles – diagnostic systems • Requirements for exchange of digital information • Can be converted to RS-232 via a chip

  9. Possible application PAD 1 Detect If Your Drink Has Been moved PAD 2

  10. SPI interface chips -- Used during Lab. 4. • Ability to send data over 1 line • Master Out Slave In – MOSI (Master sends, slave receives) • Ability to receive data over 1 line • Master In Slave Out – MISO(Slave sends, master receives • Control many devices. Each devices is “told to listen” using a chip-select (CS) line • Can use PF1, PF2 …………… PF7 • PF0 line can be used to switch Blackfin into a slave mode (Two Blackfins talking to each other)

  11. Master / Slave conceptSlave Select (Chip Select) • Blackfin master sends out active low chip select signal SS1, then slave 1 selected (responds) • Master sends out active low chip select signal SS3, then slave 3 responds PF5 PF6

  12. Lab. 4 SPI interface project SPI signals from Blackfin1 line (MOSI) + Clock + PF5 (SSI) 16 output linesused to control LCD screenor the radio controlled car

  13. Multiple Switch Detection InterfaceMC33993 – Part of security system laboratory Blackfin MOSICLKPF5MISOPF9PF10?

  14. MC33993

  15. MC33993 – Timing info Bits value = switch On/off – stream of 20 bits SG13 ON/OFF, SG12 ON/OFF, SG11 ON/OFF ----- SO0 ON/OFF ………….

  16. ADIS16003 – Uses SPI interfaceDual axis accelerometer AND Thermometer CLKPF5 MISO PF6

  17. ADIS16003 – Uses SPI interfaceDual axis accelerometer AND Thermometer

  18. ADIS16100 – Gryosensor

  19. Serial Digital Output • Analog values – say temperatures from minus 40C to plus 100 measured • Value converted into “pulse length information” – digital signal • Transmitted over a single wire

  20. ADI – TMP03 Serial Digital Output Thermometer Will use the same ideas in Lab. 3 GROUND WIRE +5VPF11 connection on Blackfin Interface

  21. Block diagram for the TMP03

  22. TMP03 Output characteristics

  23. More information on the sigma-delta modulator used to generate TMP03 output

  24. ADXL213 Dual Axis Accelerometer PF9 PF8

  25. ADXL213 Dual Axis Accelerometer PF9 PF8

  26. ADXL213 Dual Axis Accelerometer

  27. ADXL213 Dual Axis AccelerometerOutput when used as “tilt sensor” X 50%Y 80% X 50%Y 20% X 50%Y 50%

  28. Reference Information • Pictures are taken from various data sheets available from the Analog Devices and Freescale (Motorola) web sites • Proposed use of devices are for concept purposes only and no guarantee is made regarding suitable of circuits suggested • Application notes are also available on the website

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