Electric power starting resetting circuit

Abstract

This invention relates to a supply turn-on reset circuit including a regulation circuit, a charge / discharge unit and an output circuit, in which, the regulation circuit receives and regulates time pulse signals to output control signals and the lowest quasi-bit of the control signal is limited above the pre-designed one, the charge / discharge unit with the capacity device receives the control signal to decide if it charges / discharges to the capacitor according to the control signal and outputs the storage voltage of the capacitor to be received by the output circuit outputting the reset signals, in which, the regulation circuit regulates the wave and the lowest quasi-bit of the regulation control signal to decide the duty cycle ratio driving the unit to charge / discharge and the output circuit decides if to start or stop the reset signal based on that if the storage voltage reaches to the critical voltage of the output circuit.

Description

Technical field [0001] The present invention relates to a reset signal generating circuit, and more particularly to a power-on reset circuit. Background technique [0002] When designing an electronic circuit, a reset mechanism is often added to the circuit, so that the designed electronic circuit can be restored to an initial state when needed. Especially when the electronic circuit is powered on (turned on), each component (such as a register) in the circuit is in an indeterminate state. At this time, the circuit needs to be reset to set each component in the circuit to an initial state. [0003] Therefore, a circuit must be designed to generate a reset signal at the beginning of power-on, so that the state of all electronic circuits can be set to the initial state. Figure 1A It is a traditional power-on reset circuit. Please refer to Figure 1A When the power is not turned on, the charge stored on the capacitor 112 will be discharged through the resistor 111. Therefore, when ...

AI Technical Summary

Problems solved by technology

It can be clearly seen from the figure that under the same RC (resistor-capacitor) components, the reset time provided by the power-on reset circuit 120 is obviously insufficient

In addition, it can be observed from FIG. 2 that although the time of the reset signal output by the power-on reset circuit 130 is relatively long, there will be severe oscillations.

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