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TMS320F280025: Opens/Shorts Detection Circuit Usage

Emma Wang
Expert 5290 points
Part Number: TMS320F280025


Hi expert,

My customer is using F280025 and they find there is an Opens/Shorts Detection Circuit on ADC module,

they want to know what is the scenario to use it ? and what side affect on using this?

BR

Emma

  • 0
    TI__Expert 3720 points

    Hi,

    The subject matter expert assigned to this thread is out of office this week due to the the US holiday so you may not get a qualified answer until Tuesday or Wednesday next week.  I apologize for the delay.

    Regards,

    Himanshu

  • 0 in reply to Himanshu Chaudhary60
    TI__Mastermind 39170 points

    Hi Emma,

    Section 15.11 in TRM covers the description and implementation of the OSDETECT feature of the ADC.  With this feature, users would be able to detect open/shorted ADC input pins (as described in sections 15.11.2 and 15.11.3) as part of diagnosis routine for the ADC before using it in application.

    Regards,

    Joseph

  • 0 in reply to Joseph Casuga
    TI__Expert 5290 points

    Joseph,

    Thanks for your reply. However,  I can not find the  sections 15.11.2 and 15.11.3 in newest TRM.

    BR

    Emma

  • 0 in reply to Emma Wang
    TI__Mastermind 39170 points

    Hi Emma,

    Sorry for providing you the incorrect information.  For F280025, the ADC OSDETECT section can be found in section 15.9 and the topic for detecting an OPEN and SHORTed pin can be found in sections 15.9.2 and 15.9.3.

    Please note the below paragraph in the TRM when using the OSDETECT feature of the ADC block:

    "

    You must interpret the results based on what is driving on the input side and what are the values of RS and CP. If

    the VS signal can be disconnected from the input pin, the circuit can be used to detect open and shorted input

    pins as described in the following sections.

    "

    In order for the circuit to work, the ADC channel to be checked should be able to disconnect from the external source, otherwise the external impedances (Rs, Cp) and the driving signal Vs (from fig 15-11) should be accounted for.

    Best regards,

    Joseph