Peripherals and their Control An overview of industrially

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 – 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 – MC 33993 Multiple -- Switch Detection Interface – ADIS 16003 accelerometer and temperature sensor • Digital Output – modulated pulse width – – Handle with PF interface as with switches TSL 230 R – Light sensor – Lab. 2 ADI - TMP 03 thermometer – Lab. 3 ADXL 213 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?

MMA 6260 Q Dual Axis Accelerometer – Analog Output Left Channel ? Right Channel? Could we modify the “Talk-through program from Lab. 1 to work with this accelerometer? • Concern 1 – voltage levels – can’t blow Blackfin A/D • Concern 2 – is the 48 k. Hz bandwidth of the audio A/D enough Probable solution – use a non-audio, more general A/D connected via SPI interface

MMA 6260 Q

MMA 6260 Q Dual Axis Accelerometer Used as “tilt” sensor – static mode

MXPM 2010 – Pressure sensor Differential pair output How connect to A/D? Convert to single sided signal via op-amp and then connect?

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

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

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

SPI interface chips -- Used during Lab. 4. • Ability to send data over 1 line – Master Out Slave In – MOSI • Ability to receive data over 1 line – Master In Slave Out – MISO • Control many devices using a chip-select (CS) line – Can use PF 1, PF 2 …………… PF 7 – PF 0 line can be used to switch Blackfin into a slave mode

Master / Slave concept Slave Select (Chip Select) • Master sends out active low chip select signal SS 1, PF 5 then slave 1 responds • Master sends out active low chip select signal SS 3, then slave 3 responds PF 6

Lab. 4 SPI interface project SPI signals from Blackfin 1 line (MOSI) + Clock + PF 5 (SSI) 16 output lines used to control LCD screen

Multiple Switch Detection Interface MC 33993 – Part of security system laboratory Blackfin MOSI CLK PF 5 MISO PF 9 PF 10?

MC 33993

MC 33993 – Timing info Bits value = switch On/off – stream of 20 bits SG 13 ON/OFF, SG 12 ON/OFF, SG 11 ON/OFF ----- SO 0 ON/OFF ………….

ADIS 16003 – Uses SPI interface Dual axis accelerometer AND Thermometer CLK PF 5 MISO PF 6

ADIS 16003 – Uses SPI interface Dual axis accelerometer AND Thermometer

ADIS 16100 – Gryosensor

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

ADI – TMP 03 Serial Digital Output Thermometer Will use the same ideas in Lab. 2 to measure the TSL 230 R Light Sensor GROUND WIRE +5 V PF 8 connection on Blackfin Interface

Block diagram for the TMP 03

TMP 03 Output characteristics

More information on the sigma-delta modulator used to generate TMP 03 output

ADXL 213 Dual Axis Accelerometer PF 9 PF 8

ADXL 213 Dual Axis Accelerometer PF 9 PF 8

ADXL 213 Dual Axis Accelerometer

ADXL 213 Dual Axis Accelerometer Output when used as “tilt sensor” X 50% Y 20% X 50% Y 80% X 50% Y 50%

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