Reference Circuit for using AD5700 in HART Master Mode

In order to acquire readings from one or more HART-enabled Loop-Powered Smart Transmitters, we are planning to use AD5700 in HART Master Mode. It would be of immense help, if one can give us a reference circuit using AD5700 in HART Master Mode. At high-level the functional diagram is as shown below.  Thanks a lot !

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  • +1
    •  Analog Employees 
    on Aug 28, 2020 5:17 PM 2 months ago

    Hi corvid,

    Please take a look at the following reference designs: CN0414, CN0418, or CN0435 (PLC/DCS system example).

    Regards,
    Mihai

  • Hi Mihai,

    Thank you for the quick response. We went through all the reference circuits. It gave us a fair bit of idea. It helped us to understand that the circuit given in page #17 of AD5700/AD5700-1 data sheet, may also fit our requirement.  

    Few doubts:

    1. Can we use the circuit in Fig 28 for interfacing one or more HART Field Instruments in Multi-drop mode ?
    2. In Fig 28, Can we use SMPS output voltage for V.loop ? 
    3. Is it possible to use the circuit in Fig 28 for interfacing normal 4-20mA based non-HART field instruments as well ?
    4. Which one of the circuit is recommended for harsh industrial or outdoor environments ?
    5. Are there any standard guidelines we need to know for using these circuits in harsh industrial or outdoor environments ?

    Thank you
    Corvid Team

Reply
  • Hi Mihai,

    Thank you for the quick response. We went through all the reference circuits. It gave us a fair bit of idea. It helped us to understand that the circuit given in page #17 of AD5700/AD5700-1 data sheet, may also fit our requirement.  

    Few doubts:

    1. Can we use the circuit in Fig 28 for interfacing one or more HART Field Instruments in Multi-drop mode ?
    2. In Fig 28, Can we use SMPS output voltage for V.loop ? 
    3. Is it possible to use the circuit in Fig 28 for interfacing normal 4-20mA based non-HART field instruments as well ?
    4. Which one of the circuit is recommended for harsh industrial or outdoor environments ?
    5. Are there any standard guidelines we need to know for using these circuits in harsh industrial or outdoor environments ?

    Thank you
    Corvid Team

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