NIS54xxGEVB
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NIS545x Reset from Thermal Shutdown
Continue with jumpers J2 (10 Ω), J1 (545x), J4, and J13. Once the eFuse reaches thermal shutdown the
enable pin falls to 1.4 V. Return the power supply to 5 V and press the blue button to reset the eFuse. An auto-retry
eFuse (MT2 part number suffix) does not latch and automatically cycles the enable pin. For auto-retry eFuses the
demo board’s green and yellow indicator enable pin indicator LEDs will flash as the enable pin cycles between
states.
Figure 11: This test shows how the enable pin is used to reset the device after a thermal
shutdown event. After pressing the blue button the enable pin falls to 0 V and then comes to
about 3.3 V after releasing the blue button. At that point the efuse turns on. An auto-retry device
such as the NIS5450MT2 will reset automatically from thermal shutdown and pressing the blue
button is not necessary.
