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About Comparator Subsystem (CMPSS)

has
Prodigy 50 points
Other Parts Discussed in Thread: CONTROLSUITE, C2000WARE

nice to meet you all.
I would like to use Comparator Subsystem (CMPSS) with TMS 28375S.
Does this function work normally with WDT?
I call a manual, but I can not understand it.
In addition, I want you to tell me if I have to be careful when using CMPSS.
Thank you.
  • 0
    TI__Mastermind 28275 points

    Hi Hara,

    Welcome to the forum.

    You can find examples for using the CMPSS in ControlSUITE or C2000Ware in the device specific folders. Not sure what WDT stands for, can you clarify that? Also, do you mind expanding on the part of the Technical Reference Manual you were having comprehension issues?

  • 0 in reply to Frank Ankapong
    Prodigy 50 points
    I am sorry I missed the explanation.

    What I was saying:

    WDT = Watchdog Timer
    Source: Figure 11-1 CMPSS Module Block Diagram (P.1354)

    I want to detect overcurrent in software using this module.
    I would like to use COMPSTS [COMPLLATCH], CTRIPL (to be connected to TRIP 4 in the future)

    In other words, I want to know how reliable this module is.
    For example, can overcurrent detection be performed even when Watchdog is generated? etc. . .

    Thank you.

    spruhx5d.pdf

  • 0 in reply to has
    TI__Mastermind 28275 points

    Hara,

    Detecting overcurrent/overvoltage is one of the common use-cases for the CMPSS.

    In broad terms, you compare the monitored current against a reference current and when the overcurrent condition happens, the CMPSS will trip.

    Not sure what you mean by "how reliable" but if you are asking how good of a solution the CMPSS is for detecting an overcurrent condition, i'll say it's one of the best mostly because it's very fast. However, like all comparators, the CMPSS will be sensitive to noise on the input. To help mitigate that, there are a lot of features built into the CMPSS to make the system more immune to noise like configurable hysteresis, output filter and a latching mechanism.

    A watchdog timer reset will reset the peripherals including the cmpss configuration registers so the cmpss will no longer trip because it will have to be reconfigured.