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TPS1HA08-Q1: EN pin input characteristics of TPS1HA08-Q1

Reagan Li
Prodigy 545 points
Part Number: TPS1HA08-Q1

Hi, I am using TPS1HA08-Q1, and I don't understand the input characteristics of EN pin.

①I do know that  If the device is off and want it to go on then the voltage of the pin has to go to VIH, EN 2.0V ,if the device is on and want it to go off then the voltage of the pin has to go to VIL, EN 0.8V.

But I don't understand the relationship between 1.5V,2V and 250mV, could you pls draw a simple plot to illustrate the relationship between output state and EN pin voltage? (just like the attached plot)

②I have done some tests on TPS1HA08 , the result is that the device is off  when the voltage of EN pin goes to 1.56V, the device is on  when the voltage of EN pin goes to 1.86V. The result is quite similar to the Typical Characteristics in the datasheet which is shown below.

But how does that happen as the 1.56V is bigger than  VIL_(MAX)=1.5V and  1.86V is smaller than VIH_(MIN)=2V?

Thanks!

  • 0
    TI__Genius 13300 points

    Hello Reagan,

    What TI guarantees is that the device WILL turn on at 2v, and off at 0.8v. What happens between is not within what is specified in the datasheet so I am unable to give any guarantees within that range. As long as the device isn't turning off above 2v or turning on below 0.8v it's within the parameters specified by TI. The hysteresis means that the device requires at least 250 mV of difference for it to note a change so that noise will not cause the device to turn on or off. 

    Regards,

    Kalin Burnside

  • 0 in reply to Kalin Burnside
    TI__Prodigy 545 points

    Hi Kalin,

    Thank you for your response. I understand the input characteristics of EN pin now.

    Regards,

    Reagan