Power-on reset circuit being fee of static power consumption

Abstract

The invention relates to a power-on reset circuit being fee of static power consumption. The power-on reset circuit includes a voltage detection circuit, a hysteresis comparison circuit and a voltage shaping circuit which are sequentially and electrically connected; the voltage detection circuit includes a transistor MN1, a transistor MN2, a transistor MP1 and a transistor MP2; the transistor MN1, the transistor MP1, the transistor MN2 and the transistor MP2 are connected in series, the drain of the next transistor is connected with the source of the previous transistor; the drain of the transistor MN1 and the source of the transistor MP1 are connected with the hysteresis comparison circuit; the hysteresis comparison circuit converts the output signal of the voltage detection circuit into a rectangular wave; and the voltage shaping circuit is used for eliminating tiny perturbations in the rectangular wave, and the output end of the voltage shaping circuit is the output end of the power-on reset circuit. The static power consumption problem is solved by selecting a P-channel MOS transistor, the power-on reset function is realized while the static power consumption is eliminated, and the power-on reset circuit can be widely applied to the low power consumption filed of handheld devices.

Description

Technical field [0001] The invention belongs to the technical field of semiconductor integrated circuits, and in particular relates to a power-on reset circuit without static power consumption. Background technique [0002] The upper voltage is from scratch, and will be at a high level for a period of time at RESET, and then because this point is grounded through a resistor, the level of the RESET point will gradually change to a low level, so that the reset port level of the microcontroller changes from 1 to 0, to achieve the function of resetting the microcontroller. Such a reset method is the so-called power-on reset. [0003] Power-on reset circuits (POR, power-on reset) are widely used in various integrated circuit chips to provide a safe power-on reset signal for the system; the circuit is prohibited from working when the chip power supply cannot reach the specified voltage, and when the chip power supply reaches the specified voltage An indication signal is given after the...

AI Technical Summary

Problems solved by technology

In order to meet these requirements, the traditional POR circuit will take up a large space, which is undesirable in an integrated system

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