Reset circuit based on low-voltage detection function

Abstract

The invention discloses a reset circuit based on a low-voltage detection function. The reset circuit with simple structure and low power consumption comprises a voltage detection module, a reset output module, a voltage amplification module, a voltage shaping A module, and a voltage shaping B module, wherein the voltage detection module is used for forming a threshold voltage value which is needed by the reset circuit to generate a reset signal, and determining the working state of the reset circuit in the voltage electrifying or power down process of a VDD (Virtual Device Driver) power supply according to the threshold voltage value; the reset output module is used for outputting a low level to serve as a reset signal when the reset circuit is in an unnormal work state, and outputting a high level when the reset circuit is in a normal work state; the voltage amplification module is used for outputting a low level to serve as a memorizer lock enable signal when the reset circuit is inan unnormal work state, and outputting a high level to serve as a memorizer enable signal when the reset circuit is in a normal work state; the voltage shaping A module is used for shaping the outputvoltage of the reset output module; and the voltage shaping B module is used for shaping the output voltage of the voltage amplification module.

Description

technical field [0001] The invention relates to a reset circuit of a radio frequency identification system, in particular to a reset circuit based on a low-voltage detection function in a passive smart card label chip. Background technique [0002] The radio frequency identification system is an automatic identification system composed of electronic tags, readers and computer networks. Usually, the reader emits energy in an area to form an electromagnetic field. When the electronic tag passes through the area, it detects the signal of the reader and sends it to store Data, the reader receives the signal sent by the tag, decodes and verifies the accuracy of the data to achieve the purpose of identification. [0003] Passive smart card tag chip refers to the tag without battery inside, relying on receiving the radio frequency signal sent by the reader to convert the carrier wave into DC power for the internal circuit of the chip to work. It integrates a microprocessor (MCU) an...

AI Technical Summary

Problems solved by technology

This not only makes the circuit structure more complex, increases the difficulty of the area and design, but also adds another part of the data protection circuit to generate additional power consumption

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