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Low-voltage reset circuit

A reset circuit, low-voltage technology, applied in the direction of electrical components, electronic switches, pulse technology, etc., can solve the problems of increasing power consumption and area, low-voltage reset failure, etc., and achieve the effect of improving circuit performance

Active Publication Date: 2020-01-31
西安中颖电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The traditional high-precision low-voltage reset circuit is prone to the problem of low-voltage reset failure when the system is powered on quickly. In order to solve this problem, the system needs to add other circuit modules to make up for this serious problem caused by fast power-on. However, the newly added The circuit not only needs to increase power consumption and area, but also has more or less defects in other aspects

Method used

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Embodiment Construction

[0043] The detailed features and advantages of the present invention are described in detail below in the specific embodiments, the content of which is sufficient to enable any person skilled in the art to understand the technical content of the present invention and implement it accordingly, and according to the specification, claims and drawings disclosed in this specification , those skilled in the art can easily understand the related objects and advantages of the present invention.

[0044] The main function of the low-voltage reset (LVR, LowVoltage Reset) circuit is to generate a reset (reset) signal with a high-level pulse of appropriate width when the power supply voltage is lower than the set voltage value during the power-on or power-off process of the system. Reset the system to ensure the stability of all internal digital logic. The LVR circuit is an essential and important circuit module of the microcontroller (MCU) system, and is widely used in the fields of anal...

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Abstract

The invention provides a low-voltage reset circuit. The low-voltage reset circuit comprises a first resistor, a second resistor, a time-delay resistor, a time-delay capacitor, a band-gap reference source and a comparator. The first resistor and the second resistor are connected in series and are coupled between a power supply voltage and the ground. The time-delay resistor and the time-delay capacitor are connected in series and are coupled between the power supply voltage and the ground. The comparator is provided with a positive input end, a first negative input end, a second negative inputend and an output end, and the positive input end of the comparator is connected with reference voltage VREF generated by the band-gap reference source. A first negative input end of the comparator isconnected with a sampling voltage VSAMP extracted between the first resistor and the second resistor. A second negative input end of the comparator is connected with a delay voltage VDLY extracted between the delay resistor and the delay capacitor, and the output end of the comparator is used as an output result of the low-voltage reset circuit.

Description

technical field [0001] The invention relates to the technical field of analog integrated circuits or digital-analog hybrid integrated circuits, in particular to a low-voltage reset circuit. Background technique [0002] The main function of the low-voltage reset (LVR, LowVoltage Reset) circuit is to generate a reset (reset) signal with a high-level pulse of appropriate width when the power supply voltage is lower than the set voltage value during the power-on or power-off process of the system. Reset the system to ensure the stability of all internal digital logic. The LVR circuit is an essential and important circuit module of the microcontroller (MCU) system, and is widely used in the fields of analog integrated circuits and digital-analog hybrid integrated circuits. [0003] The traditional high-precision low-voltage reset circuit is prone to low-voltage reset failure when the system is powered on quickly. In order to solve this problem, the system needs to add other cir...

Claims

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Application Information

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IPC IPC(8): H03K17/22
CPCH03K17/223Y02D10/00
Inventor 白胜天吉博
Owner 西安中颖电子有限公司
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