Electronic apparatus and operation method thereof having a low power wake-up mechanism

Abstract

The present disclosure discloses an electronic apparatus having low power wake-up mechanism that includes an upper layer circuit and a physical layer. The upper layer circuit is powered off in a sleep state. The physical layer wakes up the upper layer circuit in the sleep state according to a logic state transition event that switches a pair of differential signal lines of a USB interface from a sleep logic state to a wakeup logic state such that a power of the upper layer circuit is restored. The physical layer modifies a voltage state of the differential signal lines to drive a host apparatus to detect a pull-out event and a plug-in event in series. The physical layer controls the upper layer circuit to perform initialization and enumeration process with the host apparatus to reconnect with the host apparatus.