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Original question:

ST signal state

LM66100: disconnection event detection with LM66100

Besson
Prodigy 140 points
Part Number: LM66100

Dear, 

I have another question about the comparator inside LM66100.

how to use LM66100 to detect a power supply disconnection event immediately? the configuration I used currently is "Always-ON Reverse Current Blocking (RCB)" circuits which specified in section 8.3.2 of datasheet,  and tested that the ST signal is not going to low immediately when I disconnected the power supply from LM66100, it will go low when power supply voltage on board is lower than 1.5V, but that is not what we want, we want a immediate disconnection detected by MCU, do you think we can achieve with LM66100?

  • 0
    TI__Mastermind 34935 points

    Besson,

    Probably the easiest way to do this would be to just monitor the voltage on the input rail from using the ADC of your microcontroller or use a microcontroller with a built in fast comparator such as an MSP430. That will give you an integrated way of doing without addition components. In your RCB configuration you need to have reverse current flowing to activate the ST pin that you could potentially read in through the MCU so using the LM66100 for this purpose would likely not be the right approach.