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TPS1HB08-Q1: How to understand fault detect in datasheet table 4

Wayne Liu
Expert 8605 points
Part Number: TPS1HB08-Q1

Hi

How to understand fault detect in datasheet table 4？ Is it a input pin but which pin? How to select it? Thanks. 

  • 0
    TI__Genius 13260 points

    Hello Wayne,

    The first column indicates whether you have DIAG_EN pin low or high. The first row shows if you have the DIAG_EN pin low the SNS pin will output High-z. The x's under "SEL1" and "FAULT DETECT" indicate "don't care". The second row shows that if you have DIAG_EN pin high, and SEL1 pin low and no fault is detected the SNS pin will measure output current. The SNS pin only indicates faults if it's low, but when its high the SNS pin outputs a temperature sense current. You can see that in the fourth row with DIAG_EN high, SEL1 low, and a fault detected that the SNS pin outputs the current fault high-level.

    Regards,

    Kalin Burnside

  • 0 in reply to Kalin Burnside
    TI__Expert 8605 points

    Kalin,

    Thanks for your reply. A further question, the Isnsfh is defined 4.5mA typical, what's the related output current? 4.5mA*5000？What's the relationship between Isnsth and current limit threshold? Thanks. 

  • 0 in reply to Wayne Liu
    TI__Mastermind 18934 points

    Wayne,

    In the fault condition the Isnsfh does not correlate to the output load current as the SNS pin does during non-fault normal operation. It is a independent current that is there to represent a fault condition such as a current limit or open load. The idea is that if current is being read by the ADC then the software on the microcontroller can recognize it as a fault condition and take the necessary steps.