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Original question:

LM66100: LM66100 disconnect battery from VIN

ST signal state

Besson
Prodigy 140 points

Other Parts Discussed in Thread: LM66100

Dear, 

I have a similar question about the comparator inside LM66100.

My case is that I want to use two of "Always-ON Reverse Current Blocking (RCB)" circuits which specified in section 8.3.2 of datasheet, cause there is only one power supply(3.6V) will be plugged in for application (only one configuration will be enabled at the time). Then the two ST signals will be pull up by local power supply(2.8V) respectively, and then connected to GPIO of MCU for status indication(to indicate which power supply is plugged in). 

So my expectation is that two ST signals will perform like this: 

ST1

ST2

Status

High

Low

Power 1 plugged in; Power 2 unconnected

Low

High

Power 2 plugged in; Power 1 unconnected

do you think this topology will work properly as expected?  

  • 0
    TI__Guru** 107731 points

    Hi Besson,

    Thanks for reaching out.

    We will reply to this by early next week.

    Best regards, Rakesh

  • 0 in reply to Rakesh
    TI__Genius 14070 points

    Hi Besson,

    Welcome to E2E!

    From my understanding you will have 2 independent circuits configured like the one shown in section 8.3.2 of the datasheet for "Always ON Reverse Current Blocking" feature of the LM66100. There will also be an MCU connected to the ST pin of each device and pulling them high to know the status of which circuit is operating.

    If my understanding is correct then ST should perform the operation you are trying to achieve. ST will go high for devices that are ON and low for when a device is disabled (VIN<1.5V).

    If my understanding is not correct would you be able to provide a schematic?

    Best regards,

    Andy Robles

  • 0 in reply to Andy Robles
    Prodigy 140 points

    Hi Andy 

    thanks a lot for your reply, your understanding is correct and your answer releases my concern already, thanks again.