Power on reset circuit

A technology of electric reset and circuit, applied in the direction of electrical components, electronic switches, pulse technology, etc., can solve the problems of poor anti-noise performance, high static power consumption, low reliability, etc., to reduce the area and achieve static zero power consumption Design, Effect of Power Consumption Reduction

Active Publication Date: 2012-04-04
SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a power-on reset circuit, which is used to ...

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Embodiment Construction

[0030] Embodiments of the present invention are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes, and various modifications or changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention.

[0031] see Figure 2 to Figure 7 . It should be noted that the diagrams provided in this embodiment are only schematically illustrating the basic idea of ​​the present invention, and only the components related to the present invention are shown in the diagrams rather than the number, shape and shape of the components in actual implementation. Dimensional drawing, the type, quantity and proportion of each component can be changed arb...

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Abstract

The invention provides a power on reset circuit, comprising a voltage detecting module, a Schmitt trigger, a phase inversion control module and a pulse shaping circuit, wherein, in a power on progress of a power supply, the voltage detecting module detects voltage change of the power supply and outputs a sampling signal; the sampling signal enters the Schmitt trigger and outputs a step signal; onone hand, the step signal is output to the voltage detecting module for controlling rapid effusion of the voltage detecting module so as to lower the sampling signal; on the other hand, the phase of the step signal is inverted through the phase inversion control module and then the step signal is used for controlling switching effusion of the voltage detecting module; at last, the step signal is delayed and treated through XOR operation by the pulse shaping module, and then a power on reset signal is output. Design of the power on reset circuit provided by the invention is simple in structure; by utilizing delaying characteristics of two paths of feedback control signals and the Schmitt trigger, the power on reset circuit has very high stability and good anti-noise performance; and, afterpower on is finished, static power consumption of the power on reset circuit is very low.

Description

technical field [0001] The invention belongs to the field of integrated circuits, in particular to a power-on reset circuit. Background technique [0002] In order to ensure the stable and reliable operation of the circuit in the microcomputer system, the reset circuit is an indispensable part. The first function of the reset circuit is power-on reset. The normal operation of general microcomputer circuits requires the power supply to be stable in a constant voltage range. Since the microcomputer circuit is a sequential digital circuit, it needs a stable clock signal. Therefore, when the power is turned on, the reset signal is removed only when the voltage value is within the required range and the crystal oscillator works stably, and the microcomputer circuit starts to work normally. Work. That is to say, when the power supply voltage rises to the normal working voltage, the power-on reset circuit needs to provide a reset signal for the whole system to realize the reset f...

Claims

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Application Information

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IPC IPC(8): H03K17/22
Inventor 王兆敏蔡道林陈后鹏宋志棠
Owner SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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