Hon Hai Precision Industry Co., Ltd.

Chen-Hsuan Ho

Han-Che Wang

Shin-Hong Chung

Chun-Wei Pan

A power-off circuit includes a power unit (), a power management unit (), an integrated circuit chip (IC chip,), a switching apparatus (), and a clamp circuit (). The switching apparatus produces and transmits a power-off instruction to the power management unit. The power management unit produces and transmits a power-off notice to the IC chip in accordance with the power-off instruction. And the IC chip feeds back a power-off affirmation in accordance with the power-off notice to the clamp circuit. The clamp circuit receives the power-off affirmation and produces and transmits interrupted power-off signals to the power management unit, till the power management unit completely cuts off power supplied from the power unit to the IC chip.

Power-off circuit

An input circuit shared by multi signal sources each of which outputting a type of signals includes a processing unit (). The processing unit includes a plurality of input pins () and an interrupt pin (), each of the input pins connecting with one or more of the signal sources and receiving signals from the signal sources. The input circuit further includes a tristate buffer () The tristate buffer includes an enable pin () enabling the tristate buffer upon receiving an enable signal, a plurality of input pins () connecting with one or more of the signal sources and receiving signals from the signal sources, and a plurality of output pins () connecting with the interrupt pin of the processing unit and producing an interrupt signal to the interrupt pin according to the signals received at the input pins. A related wake-up signal input circuit is also provided.

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Guangdong, China

Chen-Hsuan Ho