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Original question:

DAC8742H: Burst command, HART

DAC8742HEVM: Request for HART Stack Support and TI Controller Recommendation for DAC8742H Evaluation

PRIYANKA KASTURE
Prodigy 80 points

Part Number: DAC8742HEVM
Other Parts Discussed in Thread: DAC8742H, PROFIBUS, TIDA-01504, TIDA-060020, MSP430FR5969, AFE881H1, AFE882H1, EK-TM4C1294XL

Dear TI Support Team,

We are currently evaluating the DAC8742H for development and testing of HART communication in our industrial instrumentation platform.

Our objective is to validate HART communication over a 4–20 mA loop and understand the implementation architecture for integration into our final product design.

We request your support on the following points:

  1. HART Stack Availability

  • Please let us know whether TI provides a HART communication stack, reference firmware, middleware, or evaluation software compatible with DAC8742H.

  • We would appreciate any application notes, sample projects, API documentation, or reference designs available for:

    • HART Physical Layer implementation

    • Master/Slave communication testing

    • Command handling

    • UART interface configuration

    • FSK modulation/demodulation validation

  1. Controller Recommendation
    We are also looking for a suitable TI microcontroller recommendation for interfacing with DAC8742H in an industrial-grade application.

The controller should preferably support:

  • Industrial communication applications

  • SPI/UART interfaces

  • RTOS capability

  • Future scalability for protocols such as HART, FOUNDATION Fieldbus, and PROFIBUS PA

Please suggest suitable TI controllers/processors along with any recommended development kits.

  1. Evaluation and Testing Guidance
    If available, kindly share:

  • Recommended hardware architecture

  • Schematic/reference circuit recommendations

  • HART modem validation procedure

  • EMC/industrial design considerations

  • Any available EVMs or software tools for rapid evaluation

We are in the process of selecting the communication architecture for our upcoming industrial calibrator/field communication platform, and your guidance will help us significantly during the evaluation phase.

Looking forward to your technical support and recommendations.

 

Thanks & Regards,

  • 0
    TI__Expert 5670 points

    Hi,

    We are reviewing this and will get back to you shortly.

    Thank you,
    Lucas

  • 0
    TI__Guru** 100755 points

    Priyanka,


    I'll go through what TI has put together in the past and put links for you to explore and download.

    We've done some designs to show the HART does work with this product family, buy this is basically limited to the circuit and schematics. TI did not develop the HART stack for any of these designs so they're not available for download. The HART stack was developed externally by Smart Embedded Systems and we've worked with them to have them develop some solutions with this and other devices. If you'd like more information about their development of the HART stack, you can go to their website to find contact information:

    https://smartembeddedsystems.com/

    We've worked with them for several designs and they're familiar with our devices as well. They can be contracted for this type of work.

    As for other HART collateral, you can find an introductory app note discussing the HART protocol:
    https://www.ti.com/lit/pdf/slaaeh0

    For the DAC874xH family, there are two HART designs showing how we did the physical layer testing for the board.

    TIDA-01504: Highly-Accurate, Loop-Powered, 4mA to 20mA Field Transmitter With HART Modem Reference Design
    https://www.ti.com/tool/TIDA-01504

    TIDA-060020: HART-enabled PLC analog input module reference design
    https://www.ti.com/tool/TIDA-060020

    In both of these product folders, you'll find a design guide and other collateral that you'd need to physically build the board. The design guide discusses the circuit contruction and theory of operation, as well as some of the physical layer test results that were run on the board. Again, neither have the firmware or HART stack used in the design. Of the two, TIDA-01504 did go through the HART registration process. The microcontroller used for these two designs were the MSP430FR5969.

    TI has another family of devices that features a HART modem combined with a DAC. This family is the AFE881H1 and AFE882H1. Both of these have designs that were written up as application notes, showing the HART testing used in the registration process. This includes the physical layer tests and some brief discussion about the DLL, CAL, and UAL tests. Both designs were registered with FieldComm as well. You can find the writeups for those application notes here:

    AFE881H1: Design and Test of a HART-Enabled Field Transmitter for 4-20mA Loops
    https://www.ti.com/lit/pdf/slaaeh8

    AFE882H1: HART-Enabled Transmitter Based on an Evaluation Module Design
    https://www.ti.com/lit/pdf/slaaer4

    For these two designs, you can find the basic schematics in the application notes but we did not publish the PCB design files. Like the previous designs, we used the MSP430FR5969 as the microcontroller for HART. I would note that we're working on another new device that includes HART and the preliminary design uses a TM4C1294 microcontroller (using the EK-TM4C1294XL).

    That gives a basic list of most of the important material regarding HART from TI. Let me know if you have any questions.


    Joseph Wu