a CONTROLLING A REMOTE ACTUATOR USING A 4-20mA LOOP CONTROL ROOM - - PowerPoint PPT Presentation

a

9.0 PRACTICAL DESIGN TECHNIQUES FOR SENSOR SIGNAL CONDITIONING 1 Introduction 2 Bridge Circuits 3 Amplifiers for Signal Conditioning 4 Strain, Force, Pressure, and Flow Measurements 5 High Impedance Sensors 6 Position and Motion Sensors 7 Temperature Sensors 8 ADCs for Signal Conditioning I 9 Smart Sensors 10 Hardware Design Techniques

a

9.1 CONTROLLING A REMOTE ACTUATOR USING A 4-20mA LOOP

4-20mA DAC µC HOST COMPUTER REGULATOR LOOP SUPPLY RSENSE

CONTROL ROOM

4-20mA OUTPUT ACTUATOR

AD420

12V TO 32V LOOP RETURN

a

9.2 4-20mA LOOP POWERED SMART SENSOR

SENSOR ADC µC 4-20mA DAC RSENSE

AD421

ICOMMON < 4.00mA ADC µC HOST COMPUTER REGULATOR LOOP SUPPLY RSENSE 3.3V / 5V AD7714/AD7715 IAD421 < 0.75mA

CONTROL ROOM

DMOS FET DMOS FET: Supertex DN2535 Siliconix ND2020L or ND2410L 4-20mA RETURN LOOP POWER I µC+SENSOR < 2.75mA I AD7714/AD7715 < 0.50mA ICOMMON

a

9.3 HART INTELLIGENT REMOTE TRANSMITTER USING AD421 LOOP-POWERED 4-20mA DAC

SENSOR ADC µC 4-20mA DAC AD421 HART MODEM BELL 202 WAVEFORM SHAPER BANDPASS FILTER LOOP POWER LOOP RETURN CC

HT20C12 / 20C15 (Symbios Logic)

HART DIGITAL SIGNAL: 1200Hz, 2200Hz FREQUENCY SHIFT KEYING (FSK)

a

9.4 INDUSTRIAL NETWORKING

NODE

FIELD NETWORK

NODE NODE BRANCH NODE SMART SENSOR SMART SENSOR DEVICE NETWORK SMART SENSOR SMART SENSOR

a

9.5 SOME OF THE STANDARDS I Ethernet I Foundation Fieldbus I Lonwork I Profibus I Interbus-S I Universal Serial Bus (USB) I CAN-Bus I Device-Net I WorldFIP I P-NET I HART I ASI

a

9.6 THE IEEE 1451.2 SENSOR INTERFACE STANDARD NCAP

FIELD NETWORK - OR - DEVICE NETWORK

TII

STIM

TEDS Sensor

• r

Actuator

I NCAP

= Network Capable Application Processor

I TII

= Transducer Independent Interface

I TEDS

= Transducer Electronic Datasheet

I STIM

= Smart Transducer Interface Module

a

9.7 TRUE "PLUG AND PLAY"

Lonwork NCAP Ethernet NCAP Ethernet NCAP

PC with Web Browser

Lonwork NCAP

Ethernet Field Network Lonwork Field Network

Flow Rate STIM Temperature STIM Pressure STIM

a

9.8 THE SMART SENSOR Precision Amplifier High Resolution ADC Microcontroller Sensor

Pressure Sensor, RTD, Thermocouple, Strain Gage, etc.

a

9.9 THE EVEN SMARTER SENSOR Sensor MicroConverterTM !

Pressure Sensor, RTD, Thermocouple, Strain Gage, etc.

a

9.10 THE MicroConverter™

High Performance Analog I/O + On-Chip FLASH Memory + On-Chip Microcontroller

1 2 3 =

MicroConverter™

a

9.11 ANALOG I/O 1

I Dual Σ∆ Σ∆ ADC N >16 bit N >100dB SNR (p-p) N Differential Inputs N Prog. Gain Amp N Self-Calibration I 12bit V-Out DAC N < ½ LSB DNL I Voltage Reference I Temperature Sensor I 8 chan SAR ADC N 10 bit N < ½ LSB INL I 12bit V-Out DAC N < ½ LSB DNL I Voltage Reference I Temperature Sensor I 8 chan SAR ADC N 12 bit, 5µs N < ½ LSB INL N DMA mode N Self-Calibration I Dual 12bit V-Out DAC N < ½ LSB DNL I Voltage Reference I Temperature Sensor

ADuC816 ADuC812 ADuC810

a

9.12 ON-CHIP FLASH MEMORY 2

I 8K bytes Nonvolatile FLASH Program Memory N Stores Program and Fixed Lookup Tables N In-Circuit Serial Programmable or External Parallel Programmable N Read-Only to Microprocessor Core I 640 bytes Nonvolatile FLASH Data Memory N User “Scratch Pad” for Storing Data During Program Execution N Simple Read / Write Access Through SFR Space I Programming Voltage (VPP) Generated On-Chip

ADuC816 ; ADuC812 ; ADuC810

a

9.13 ON-CHIP MICROCONTROLLER 3

I Industry Standard 8052 Core N 12 Clock Machine Cycle w/ up to 16MHz Clock N 32 Digital I/O Pins N Three 16bit Counter/Timers N Universal Asynchronous Receiver/Transmitter (UART) Serial Port I ...Plus Some Useful Extras N SPI or I2C Compatible Serial Interface N WatchDog Timer N Power Supply Monitor N Timer Interval Counter (ADuC816/810)

ADuC816 ; ADuC812 ; ADuC810

a

9.14 ADuC816 FUNCTIONAL BLOCK DIAGRAM

AIN MUX AIN MUX buf pga

Σ∆ Σ∆ ADC

ADC control and calibration

Σ∆ Σ∆ ADC

ADC control and calibration

TEMP sensor

2.5V bandgap reference

VREF detect 8K x 8 program FLASH EEPROM 640 x 8 user FLASH

synchronous serial interface

(SPI or I2C) 8052

micro- controller core

256 x 8 user RAM watchdog timer

power supply monitor asynchronous serial port

(UART)

16 bit counter timers timer interval counter OSC & PLL

DAC control

DAC1

buf buf AVDD AGND DVDD DGND SCLK SDATA/ MOSI MISO SS ALE PSEN EA RESET RxD TxD XTAL1 XTAL2 (primary channel) (auxilliary channel) AIN1 AIN2 AIN3 AIN4 VREFIN+ VREFIN– IEXC1 IEXC2 DAC T0 T1 T2 T2EX INT0 INT1 –3.5mV/°C

ADuC816

5 6 20 34 47 21 35 48 26 27 14 13 42 41 40 15 16 17 32 33 43 44 45 46 49 50 51 52 1 2 3 4 9 10 11 12 28 29 30 31 36 37 38 39 16 17 18 19 22 23 24 25 9 10 11 12 8 7 3 4 10 22 23 1 2 18 19 P0.0 P0.1 P0.2 P0.3 P0.4 P0.5 P0.6 P0.7 P1.0 P1.1 P1.2 P1.3 P1.4 P1.5 P1.6 P1.7 P2.0 P2.1 P2.2 P2.3 P2.4 P2.5 P2.6 P2.7 P3.0 P3.1 P3.2 P3.3 P3.4 P3.5 P3.6 P3.7

a

9.15 ADuC816 - PRIMARY SPECIFICATIONS

I ADC : INL

• ± 30ppm

SNR (p-p)

• >102dB (17 Noise Free Bits)

Input Range

• ± 20mV to ± 2.56V
• Conv. Rate
• 5.4Hz to 105Hz

I DAC : DNL

• ± ½LSB

Output Range

• 0 to VREF -or- 0 to VDD

Settling Time

• <4µs

I Power : Specified for 3V or 5V Operation 5V 3V Normal 7mA 3mA Idle 4.5mA 1.5mA Powerdown <20µA <20µA

a

9.16 ADuC812 FUNCTIONAL BLOCK DIAGRAM

AIN MUX

T/H

12-bit ADC

ADC control and calibration

TEMP sensor

2.5V bandgap reference

8K x 8 program FLASH EEPROM 640 x 8 user FLASH

synchronous serial interface

(SPI or I2C) 8052

micro- controller core

256 x 8 user RAM watchdog timer

power supply monitor asynchronous serial port

(UART)

16 bit counter timers OSC

DAC control

DAC1

buf AVDD AGND SCLK SDATA/ MOSI MISO SS ALE PSEN EA RESET RxD TxD XTAL1 XTAL2 ADC0 ADC1 ADC3 ADC4 VREF DAC1 T0 T1 T2 T2EX INT0 INT1 –3.5mV/°C

ADuC812

ADC2 ADC5 ADC6 ADC7 CREF

DAC0

buf DAC0 buf CONVST hardware 43 44 45 46 49 50 51 52 1 2 3 4 11 12 13 14 28 29 30 31 36 37 38 39 16 17 18 19 22 23 24 25 23 5 1 2 3 4 11 12 13 14 8 7 6 20 34 47 21 35 48 26 27 19 12 42 41 40 15 16 17 32 33 9 10 22 23 1 2 18 19 P0.0 P0.1 P0.2 P0.3 P0.4 P0.5 P0.6 P0.7 P1.0 P1.1 P1.2 P1.3 P1.4 P1.5 P1.6 P1.7 P2.0 P2.1 P2.2 P2.3 P2.4 P2.5 P2.6 P2.7 P3.0 P3.1 P3.2 P3.3 P3.4 P3.5 P3.6 P3.7 DVDD DGND

a

9.17 ADuC812 - PRIMARY SPECIFICATIONS

I ADC : INL

• ± ½LSB

SNR (p-p)

• >70dB

Input Range

• 0 to VREF
• Conv. Time
• <5µs (200kSPS)

I DAC : DNL

• ± ½LSB

Output Range

• 0 to VREF -or- 0 to VDD

Settling Time

• <4µs

I Power : Specified for 3V or 5V Operation 5V 3V Normal 18mA 12mA Idle 10mA 6mA Powerdown <50µA <50µA

a

9.18 MicroConverter™ DESIGN SUPPORT

MicroConverterTM Web Site QuickStartTM Development Kit Third Party Development Tools

1 2 3

a

9.19 MicroConverter™ WEB SITE

www.analog.com

1

I Data Sheets I Application Notes I 8051 Reference Material I Free Windows MicroConverterTM Simulator I Free Keil ‘C’ Compiler (2K limited version)

a

9.20 MicroConverter™ - QuickStart™ DEVELOPMENT KIT

I Documentation

N User’s Guide N Datasheet N Tools Tutorial N Quick Reference Guide

I Evaluation Board

N RS-232 Serial Comms N 32K External SRAM N Buffered Analog I/O

I Regulated Power Supply I Serial Port Cable

I Software

N Metalink Assembler N ‘C’ Compiler (Limited 2K) N Windows Simulator N Serial Downloader N Windows Debugger N Example Code

QuickStartTM

2

a

9.21 MicroConverter™ - THIRD PARTY DEVELOPMENT TOOLS

I Keil Compiler N A full function windows based ‘C’ compiler environment featuring a simulator for source and assembly level debugging. I MetaLink Emulator N A high end in circuit emulation system offering a complete windows based environment for in-system debug sessions.

Power Tools

3

All tools will fully integrate with each MicroConverter product The First Two of Many Third Party Tools to Fully Support MicroConverterTM Products:

a

9.22 MicroConverter™ PRODUCT ROADMAP

I Larger FLASH Memory Capacity (Data and Program) I Hardware Communications Interface Enhancements (CAN Bus, USB Bus) I Increased Microcontroller Horsepower

TIME

1 ADuC812

• 8 Channel

12 bit ADC

• Dual DAC

3 ADuC810

• Low Cost
• 10 bit ADC,

Dual DAC

2 ADuC816

• Dual 16 bit +

Σ∆ Σ∆ ADC

• Single DAC

. . . . Future Products May Include:

. . . .