Low-power-consumption pin multiplexing control system and control method thereof

Abstract

The invention discloses a low-power-consumption pin multiplexing control system and a control method thereof, and relates to the technical field of electronic circuits. The system comprises an integrated chip, a button and an LED lamp; the integrated chip includes an input module, a timing module, a button power-on module and an LED illumination module, the input end of the input module is connected with the button and the LED lamp, the output end of the input module is connected with the input ends of the timer module and the button power-on module, the output end of the timer module is connected with the input ends of the button power-on module and the LED illumination module, and the output end of the LED illumination module is connected with the input end of the input module. Thus, thebutton and the LED lamp can share one pin, a reference circuit in the system is not waken up unless the button is pressed in the whole work process, the system closes the internal reference circuit when the button is not pressed, a reference voltage and a bias current are not needed, and the power consumption is extremely low.

Description

technical field [0001] The invention relates to the technical field of electronic circuits, in particular to a low power consumption pin multiplexing control system and a control method thereof. Background technique [0002] In the prior art, an LED lighting control circuit is to be used in the circuit to control the switch control of the external LED light. Usually, an output port is required to output the LED control signal. With the rapid development of the integrated circuit, a part of the integrated circuit It is developing in the direction of fewer pins, more functions, smaller size and lower cost. Due to the limitation of the number of pins or chip space, the same pin is sometimes not only used for the input of external key information, but also requires This pin can control the lighting of the external LED light at the same time. If one pin is multiplexed to realize button detection and LED lighting control at the same time, one pin can be saved and the packaging cos...

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Problems solved by technology

[0003] Patent CN2016112142106 discloses a LED lamp control and button input time-division multiplexing circuit and its control method, without a reference voltage, realizing the time-division multiplexing circuit of buttons and LED lamps. Using a current mirror, one terminal can be used to realize the key input level The comparison can obtain the key input signal, and at the same time, this terminal can also be used for the switch control of the LED light, but the circuit needs a bias current, and the effect of low power consumption cannot be achieved.

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