Press key detection circuit integrating light-emitting diode (LED) driving and infrared remote control receiving function and integration achieving method

Abstract

The invention discloses and provides a press key detection circuit integrating light-emitting diode (LED) driving and infrared remote control receiving function and an integration achieving method. The press key detection circuit integrating LED driving and the infrared remote control receiving function comprises a press key resistance network (1), a microprogrammed control unit (MCU) chip (2), a sharing upward pull-up resistor (3), a LED driving circuit (4) and an infrared remote control receiving circuit (5). One end of the sharing upward pull electric resistance (3) is connected with a power supply. The other end of the sharing upward pull electric resistance (3) is in common ground after the sharing upward pull electric resistance (3) is in series connection with the press key electric resistance network (1). The LED driving circuit (4) is in parallel connection with the sharing upward pull electric resistance (3). A node connected by the sharing upward pull electric resistance (3) and the press key electric resistance network (1) is connected with a pin of the MCU chip. The infrared remote control receiving circuit (5) is in parallel connection with the press key electric resistance network (1). The integration achieving method comprises a press key detection step, an LED display driving step and an infrared remote control receiving signal decoding step. The press key detection circuit integrating LED driving and the infrared remote control receiving function and the integration achieving method can be used in the field of the press key detection.

Description

technical field [0001] The invention relates to a key detection circuit, in particular to a key detection circuit integrating LED driving and infrared remote control receiving functions and an integrated realization method of the circuit. Background technique [0002] There are many ways to implement key detection. In consumer electronics, the most commonly used method is to use a pull-up and pull-down resistor network and an analog-to-digital converter (ADC), referred to as ADKEY. [0003] LED (Light Emitting Diode), light-emitting diode, is a solid-state semiconductor device that can convert electrical energy into visible light, and it can directly convert electricity into light. LEDs are widely used in electronic equipment as indication and display light sources. [0004] Infrared remote control is a kind of wireless, non-contact control technology, with strong anti-interference ability, reliable information transmission, low power consumption, low cost, easy to impl...

AI Technical Summary

Problems solved by technology

It is very limited when working with an MCU with a very limited number of IOs

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