| 摘要 |
A first switch is switched to short a multi-functional pin of an integrated circuit to a ground terminal or let a current supplied to the multi-functional pin to flow to a second switch connected to the multi-functional pin. Before the integrated circuit is ready, the second switch is closed circuit and is detected its current to determine a first signal to enable or disable the integrated circuit. After the integrated circuit is ready, the second switch is open circuit, the voltage at the multi-functional pin is detected to determine a second signal to enable or disable the integrated circuit, and when the voltage at the multi-functional pin is higher than a threshold, a power good signal is triggered.
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