Power-on and power-off reset control circuit without static power consumption

Abstract

The invention discloses a power-on and power-off reset control circuit without static power consumption. The power-on and power-off reset control circuit without static power consumption comprises a power-on reset control sub-circuit and a power-off reset control sub-circuit. The power-on reset control sub-circuit comprises a first switch control unit, a first voltage division detection unit and alatch control unit. The first voltage division detection unit is used for dividing voltage and detecting power-on of the power supply; and if the first node voltage between the first voltage divisiondetection unit and the latch control unit reaches the preset threshold voltage of the latch control unit, the latch control unit outputs a reset signal, and meanwhile, the first switch control unit controls the first voltage division detection unit to be turned off. According to the invention, a circuit structure is optimized, and a determined power-on detection voltage point is obtained by usinga resistance voltage division relationship; and the basic logic unit and the feedback structure are utilized to turn off the voltage division detection unit after the power-on reset process is completed, so that the purpose of no static power consumption is achieved.

Description

technical field [0001] The invention relates to the technical field of electronic circuit control, in particular to a power-on and power-off reset control circuit without static power consumption. Background technique [0002] At present, the commonly used power-on reset circuit is a delay type power-on reset circuit, which generally adopts a series structure of a resistor and a capacitor. In the power-on stage, the resistor and capacitor are connected in series to achieve a certain delay time. After the preset delay time, the power-on reset signal is released. This kind of resistance-capacitance series power-on reset circuit has the following disadvantages: 1) Since it uses the RC delay principle, it does not detect the voltage value of the power signal, so there is no fixed power-on voltage detection point. Therefore, for a power supply that is powered on slowly, the preset delay time will be shorter than the actual power-on time. That is, the power-on reset circuit out...

AI Technical Summary

Problems solved by technology

2) If a large enough delay is designed to meet the needs of fast and slow power-on, it will result in the need for larger on-chip resistors and capacitors, which will occupy a larger area of ​​the chip, resulting in increased costs

Images