CIRCUIT DE DÉCHARGE INTÉGRÉ DERRIÈRE UN PONT REDRESSEUR DE BUS DANS UNE PUCE DE DISPOSITIF ESCLAVE

摘要

A discharge circuit integrated in a chip of a slave device to follow a bus rectifier bridge includes: a digital control module for generating, when an output result of a comparator is that a bus voltage falls, a high-level and time-configurable pulse width to drive a discharge circuit to discharge a bus; a discharge current source module for enabling the discharge of the bus by means of a digital module and adjusting a discharge current; a comparator for obtaining a status of a change in the bus voltage; and a peripheral circuit for monitoring the change in the bus voltage, providing to the comparator a voltage signal which reflects divided bus voltage fall information, and generating a comparison reference voltage. The circuit is only electrified when a bus communication falling edge is monitored, and thus the power consumption overheads of an overall system would not be additionally increased; a discharge circuit and a signal processing circuit are independent from each other, and thus the noise of a bus would not be coupled to a circuit sensitive to noise; the parameters of the discharge circuit can be configured, thus satisfying electrical property requirements of different systems and improving the adaptability of a product.