一种用于控制器的多功能端口复用电路
By employing MCU to coordinate modules such as an eight-bit shift register, a single-pole eight-throw analog switch, and operational amplifier circuits in the controller, stable multiplexing of port functions is achieved, solving the problems of single port function and high hardware cost in traditional controllers, and improving the stability and anti-interference capability of the circuit.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- WUXI XINJIE ELECTRICAL
- Filing Date
- 2025-07-29
- Publication Date
- 2026-07-17
AI Technical Summary
Traditional controller ports have limited functionality, resulting in complex hardware circuits, high costs, and difficulty in reducing device size. Existing software configuration register solutions suffer from poor circuit stability and weak anti-interference capabilities.
By employing modules such as an MCU-coordinated eight-bit shift register, a single-pole eight-throw analog switch, and operational amplifier circuits, the port can flexibly switch between analog input, digital input, digital output, and PWM output functions through hardware connections, simplifying the circuit structure and improving stability.
Stable reuse of port functions was achieved, reducing hardware costs, simplifying circuit layout, and improving the circuit's anti-interference performance and the reliability of system reset.
Smart Images
Figure CN224521037U_ABST
Abstract
Claims
1. A multi-function port multiplexing circuit for a controller, characterized by, include: MCU (U1) serves as the core control unit of the circuit. An eight-bit shift register (U23) has its serial data input pin (SER), output enable pin (OE#), memory register clock pin (RCLK), shift register clock pin (SRCLK), and shift register clear pin (SRCLR#) connected to the PF6, PF7, PF8, PF9, and PF10 pins of the MCU (U1), respectively. The output pins of the eight-bit shift register (U23) are connected to external control signal terminals. A single-pole eight-throw analog switch (U20) is provided, wherein the channel selection control pins A0, A1, and A2 of the single-pole eight-throw analog switch (U20) are respectively connected to the PH2, PH3, and PH4 pins of the MCU (U1); the input pin of the single-pole eight-throw analog switch (U20) is connected to an analog signal source. The operational amplifier circuit (U13B) has its non-inverting input connected to the output pin of the single-pole eight-throw analog switch (U20) via a first 1 / 8 resistor (R118), and a feedback resistor (R117) connected between its inverting input and output. The output is connected to the PC1 analog input pin of the MCU (U1).
2. The multi-functional port multiplexing circuit for a controller according to claim 1, wherein, The MCU (U1) is also connected to a reset circuit consisting of an eighth resistor (R8), a first sixth capacitor (C16), and a first seventh capacitor (C17).
3. The multi-functional port multiplexing circuit for a controller of claim 2, wherein, One end of the eighth resistor (R8) is connected to a 3V3 power supply, and the other end is connected to the first sixth capacitor (C16), the first seventh capacitor (C17), and the NRST pin of the MCU (U1). The other ends of the first sixth capacitor (C16) and the first seventh capacitor (C17) are grounded.
4. The multi-functional port multiplexing circuit for a controller according to claim 1 or 2, wherein The MCU (U1) is also connected to an SWD download and debug interface (J2), and the JTMS-SWDIO pin and JTCK-SWCLK pin of the SWD download and debug interface (J2) are connected to the PA13 pin and PA14 pin of the MCU (U1) respectively.
5. The multi-functional port multiplexing circuit for a controller of claim 1, wherein, The MCU (U1) is model APM32F407IGT6.
6. The multi-functional port multiplexing circuit for a controller of claim 1, wherein, The eight-bit shift register (U23) is model 74HC595PW.
7. The multi-functional port multiplexing circuit for a controller of claim 1, wherein, The model number of the single-pole eight-throw analog switch (U20) is TPW4051-TR.
8. The multi-functional port multiplexing circuit for a controller of claim 1, wherein, The eight-bit shift register (U23) has seven output pins, which are respectively connected to seven external 20mA control signal terminals.
9. The multi-functional port multiplexing circuit for a controller of claim 1, wherein, The input pins of the single-pole eight-throw analog switch (U20) are connected to eight different types of analog signal sources, including four voltage detection signal channels and four current detection signal channels.
10. The multi-functional port multiplexing circuit for a controller of claim 1, wherein, The operational amplifier circuit (U13B) is model TP5534-TR, the feedback resistor (R117) has a resistance of 10kΩ, and the first 118 resistor (R118) has a resistance of 1kΩ.