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CN-0267 Datasheet(PDF) 1 Page - Analog Devices |
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CN-0267 Datasheet(HTML) 1 Page - Analog Devices |
1 / 8 page Circuit Note CN-0267 Circuits from the Lab™ reference circuits are engineered and tested for quick and easysystemintegrationto helpsolve today’s analog, mixed-signal, and RF design challenges. For more informationand/orsupport, visitwww.analog.com/CN0267. Devices Connected/Referenced ADuCM360 Low Power, Precision Analog Microcontroller AD5421 16-Bit, Loop Powered, 4 mA to 20 mA DAC AD5700 Low Power HART Modem Complete 4 mA to 20 mA Loop Powered Field Instrument with HART Interface Rev. A Circuitsfromthe Lab™circuitsfromAnalog Deviceshave been designedandbuiltbyAnalogDevices engineers. Standard engineering practices have been employed in the design and construction of eachcircuit,andtheirfunctionandperformancehavebeentestedandverifiedinalabenvironmentat room temperature. However, you are solely responsible for testing the circuit and determining its suitabilityandapplicabilityforyouruseandapplication.Accordingly,innoeventshallAnalogDevices be liable for direct, indirect, special, incidental, consequential or punitive damages due to any cause whatsoeverconnectedtotheuseofanyCircuitsfromtheLabcircuits. (Continuedonlastpage) One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 ©2012–2013 Analog Devices, Inc. All rights reserved. EVALUATION AND DESIGN SUPPORT Circuit Evaluation Board CN0267 Circuit Evaluation Board (DEMO-AD5700D2Z) Design and Integration Files Schematics, Layout Files, Bill of Materials, Code Example CIRCUIT FUNCTION AND BENEFITS The circuit shown in Figure 1 is a complete smart industrial, loop powered field instrument with 4 mA to 20 mA analog output and a highway addressable remote transducer (HART®) interface. HART is a digital 2-way communication in which a 1 mA peak- to-peak frequency-shift-keyed (FSK) signal is modulated on top of the standard 4 mA to 20 mA analog current signal. This allows features such as remote calibration, fault interrogation, and transmission of process variables, which are necessary in applications such as temperature and pressure control. This circuit has been compliance tested, verified, and registered by the HART Communication Foundation (HCF). This successful registration provides circuit designers with a high level of confidence using one or all of the components in the circuit. The circuit uses the ADuCM360, an ultralow power, precision analog microcontroller, the AD5421, a 16-bit, 4 mA to 20 mA, loop powered digital-to-analog converter (DAC), and the AD5700, the industry’s lowest power and smallest footprint HART- compliant IC modem. Figure 1. 4 mA to 20 mA, Loop Powered Field Instrument with HART Interface (Simplified Schematic: All Connections and Decoupling Not Shown) 50Ω DAC LOOP– CIN HART_OUT ADC_IP DVDD COM AD5421 ADuCM360 REGIN PRIMARY SENSOR SECONDARY SENSOR AD5700 ADC VLOOP TEMPERATURE SENSOR REF IOVDD XTAL1 CORTEX M3 + SRAM FLASH + DMA UART SPI I2C CLOCK RESET WATCHDOG IEXC WATCHDOG TIMER REGOUT 20MΩ 1MΩ 4700pF 1.6Ω 10µF 10µF 470Ω 1µF L* L* L* TVS 40V LOW LEAKAGE 4.7V LOW LEAKAGE 10Ω 10µF 10µF 1.2MΩ 1.2MΩ 300pF 150pF 150kΩ 0.068µF 0.22µF 1µF SCLK SDO SDIN SYNC AIN4 AIN0 AIN3 AIN2 0.1µF 0.01µF 0.01µF 0.1µF AIN7 1kΩ 1kΩ 1kΩ 1kΩ 1kΩ 0.1µF 1kΩ 1kΩ 0.1µF 0.01µF 0.01µF AIN1 GND_SW AVDD AVDD ADC1 RXD TXD CD RTS SCLK0 MISO0 MOSI0 CS0 SIN P0.5 SOUT LDAC XTAL2 VCC 3.8664MHz 1µF REG_CAP AGND DGND EXPOSED PAD AGND DGND AGND 0.47µF DVDD_ REG AVDD_ REG VREF– VREF+ PT100 VREF 0.47µF 0.1µF 10µF 10µF DVDD REFOUT1 REFOUT2 P0.4 ADC0 RREF 5.62kΩ 10ppm SPI INTERFACE UART INTERFACE LOOP+ LOOP– NOTES 1. L* = FERRITE BEAD, 0.3Ω @ DC, 1kΩ @ 100MHz. 2. THE ADuCM360 EXPOSED PAD IS CONNECTED TO DGND. VREF DVDD VOLTAGE REGULATOR |
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