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A closed-loop control reset circuit

A technology of reset circuit and closed-loop control, which is applied to data reset devices, electronic switches, electrical components, etc., and can solve problems such as one-way reset mode and failure to turn on the machine.

Active Publication Date: 2019-10-22
北京永安多谱检测科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a closed-loop control reset circuit, the purpose of which is to solve the problem of single direction of the traditional reset method, and overcome the problem of failure to turn on the machine due to failure to reset normally.

Method used

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Embodiment Construction

[0008] as attached figure 2 As shown, the closed-loop control reset circuit of the present invention includes reset chip U1, single-chip microcomputer U4, NOT gate circuit U2, NOT gate circuit U3, diode D1, diode D2, resistor R1, resistor R2, resistor R3, resistor R4, resistor R5, capacitor C1, capacitor C2.

[0009] PIN3 of the reset chip U1 is the power pin VCC, the power input requirement is 3.3V, PIN1 is the ground pin GND, and PIN2 is the reset pin RESET. Once the power supply is powered on, the reset pin PIN2 of the reset chip U1 will remain at a low level for 200ms, and then become a high level to complete the process of the output PIN2 of U1 from low level to high level. The resistor R1 is to ensure When PIN2 of the reset chip U1 is in an open drain state, it can still output a correct high level.

[0010] The PIN24 of the single-chip microcomputer (MCU) U4 is the reset pin of the MCU, and the low level of the pin is active, that is, when the level of the pin is low...

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Abstract

The invention discloses a closed-loop control reset circuit. The reset circuit comprises a reset chip U1, a non-gate circuit U2, a non-gate circuit U3, a single-chip microcomputer U4, a resistor R3 and a capacitor C2, wherein the non-gate circuit U2, the resistor R3 and the capacitor C2 form an oscillator; and a default input pin (MCU_GPIO2) of the single-chip microcomputer U4 is connected with the input end of the oscillator, the output end of the oscillator is connected with the input end of the non-gate circuit U3, the output end of the non-gate circuit U3 is connected with a reset pin of the single-chip microcomputer U4, and consequently closed-loop control is formed. Through the closed-loop control reset circuit, the problem that a traditional reset mode is in a single direction can be solved, the problem that startup cannot be realized due to failure in normal reset is solved, and the reliability of system reset can be greatly improved.

Description

technical field [0001] The invention relates to a closed-loop control reset circuit, which belongs to the field of single-chip microcomputer (MCU) reset control. Background technique [0002] In order to ensure the stable and reliable operation of the circuit in the single-chip system, the reset circuit is an essential part. No matter which type of single-chip the user uses, the design of the single-chip reset circuit is always involved. The quality of the single-chip reset circuit design directly affects the reliability of the entire system. Many users, after designing the single-chip microcomputer system and successfully debugging it in the laboratory, have crashes and program go-aways on the spot, which is mainly caused by the unreliable design of the single-chip microcomputer reset circuit. The single-chip microcomputer needs to be reset when it is started, so that the MCU and various components of the system are in a certain initial state, and work from the initial sta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F1/24H03K17/22
Inventor 朱伟
Owner 北京永安多谱检测科技有限公司