NIS54xxGEVB
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NIS5431 Reset from Thermal Shutdown
Continue with jumpers J2 (10 Ω), J1 (5431), J4, J8, and J13. Once the eFuse reaches thermal shutdown the
enable pin will fall to 1.4 V. Return the power supply to 3.3 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 5: 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 will reset
automatically from thermal shutdown and pressing the blue button is not necessary.
