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TIDA-010048: IO Module input open and short detection

Shinu.V.Mathew
Expert 7445 points
Part Number: TIDA-010048

Hi Team,

One of my customer is planning to consider this TIDA for analog input module design and have below queries,

1) How the input short and open circuit is detected in this design or how it can be implemented as a part of this design.

2) Do we have any HART module which can integrate to this system or ADC with HART interface.

Please help with your inputs and comments. 

Thanks in advance for the help and support.

Regards, Shinu Mathew. 

  • 0
    TI__Intellectual 1270 points

    HI Shinu,

    thanks for contacting us via e2e regarding this customer inquiry. Please find my answers below.

    1)
    An open circuit is detected by reading 0V (due to 0mA) from the shunt. This violates the requirement of having at least a 4mA current and can be detected.
    An input short normally causes an excessive current into the shunt, but with this design the supply to the sensor transmitter (provided by TIDA-010048) is controlled by the eFuse. The output current is limited to 25mA if the power output is shorted to the input (bypassing the sensor transmitter) or if the sensor transmitter shorts. The overcurrent can also be detected by the ADC reading and the eFuse may be turned off in this case.
    Please note that the input is not protected if a unlimited 24V supply is accidentally connected to the input. Here, other means may be implemented such as a PTC or a switch.

    2)
    A HART interface maybe implemented on top of the design with a HART modem. For HART+Loop interface implementations please also refer to TIDA-060020, TIDA-01504 and TIDA-00648.   

    Hope this helps!

    Best regards,
    Lars