Bias circuit-based low-power-consumption power-on reset circuit and method

Abstract

The embodiment of the invention discloses a low-power-consumption power-on reset circuit and method based on a bias circuit. The power-on reset circuit comprises a low-power-consumption bias circuit and a power-on reset circuit, the low-power-consumption biasing circuit is connected with the power-on reset circuit; the low-power-consumption bias circuit comprises a first bias current output end, asecond bias current output end and a high-potential output end; and the power-on reset circuit comprises a third PMOS tube, a fourth PMOS tube, a third NMOS tube, a fourth NMOS tube, a seventh NMOS tube, a Schmitt trigger and a rising edge delayer. The whole circuit structure is simple, the number of elements is small, the number of current branches is small, the current of each branch can be very low, and the elements in the circuit do not work before power-on, so that the circuit power consumption is reduced, the battery consumption is reduced, and the power consumption is reduced. The third NMOS tube, the fourth PMOS tube and the pre-stage multiplexed low-power-consumption bias circuit are used for replacing a large resistor which is usually used for low power consumption and has the resistance value as high as more than ten megabytes, the area of a chip can be remarkably reduced, and the cost of the chip is greatly saved.

Description

technical field [0001] The embodiments of the present application relate to the technical field of reset circuits, and in particular to a low-power power-on reset circuit and method based on a bias circuit. Background technique [0002] MCU is a micro control unit, also known as a single-chip microcomputer or a single-chip microcomputer. Detection circuits such as digital converters, comparators, operational amplifiers, and even LCD drive circuits are integrated on a single chip to form a chip-level computer, which can be used for different combination controls for different applications. [0003] In recent years, with the great development of the Internet of Things and artificial intelligence, the difference between consumer electronics and computers has become smaller and smaller, and the functional requirements of consumer electronics have become higher and higher, and the design has become more and more complex. So many consumer electronics products use MCU as the core ...

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Problems solved by technology

[0005] The embodiment of this application provides a low-power power-on reset circuit and method based on a bias circuit to solve the problem of the MCU power-on reset circuit in the prior art. Open the circuit, the problem of high power consumption and high cost in the circuit

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