CN216871051U

CN216871051U - On-vehicle intelligent control ware IO mouth expander circuit

Info

Publication number: CN216871051U
Application number: CN202220135644.1U
Authority: CN
Inventors: 周向前; 曾佳; 周恒祥; 谭福伦; 刘明春; 王俊红; 聂石启; 黄苏杭; 李青川; 司炎鑫; 张智清
Original assignee: Shanghai Transun Telematics Technology Co ltd; King Long United Automotive Industry Suzhou Co Ltd
Current assignee: Shanghai Transun Telematics Technology Co ltd; King Long United Automotive Industry Suzhou Co Ltd
Priority date: 2022-01-19
Filing date: 2022-01-19
Publication date: 2022-07-01
Anticipated expiration: 2032-01-19

Abstract

The utility model discloses an I/O port expansion circuit of a vehicle-mounted intelligent controller, which can read 23 paths of ADC signals by arranging a plurality of expansion circuits at the signal input end of the controller by adopting a common CPU (central processing unit), does not need to replace an expensive CPU containing more I/O ports, effectively reduces the hardware cost, simplifies the circuit, improves the reading efficiency of the ADC signals and releases the resources of the CPU.

Description

On-vehicle intelligent control ware IO mouth expander circuit

Technical Field

The utility model relates to the technical field of automobile ADC sampling, in particular to an I/O port expansion circuit of a vehicle-mounted intelligent controller.

Background

With the increase of electronic devices in the current passenger car field, more and more ADC signals need to be collected. Especially after a new bus architecture is upgraded, when the ADC port of the main chip is not enough, the currently adopted method is to replace more powerful main chips with ADC ports, which undoubtedly increases hardware cost.

Disclosure of Invention

In view of the above, the present invention provides an I/O port expansion circuit of a vehicle-mounted intelligent controller, which is used to solve the problems in the background art.

An I/O port expansion circuit of a vehicle-mounted intelligent controller comprises a controller and an expansion circuit,

the expansion circuits are provided with a plurality of expansion circuits, each expansion circuit comprises an ADC sampling circuit for collecting a plurality of paths of ADC signals and a decoder connected with a signal output port of the ADC sampling circuit,

after the enable pins of all decoders are connected together, the enable pins are connected to the enable pin of the controller together,

after address pins at corresponding positions of all decoders are connected together, the address pins are connected to the address pins at corresponding positions of the controller;

the data output pins of each decoder are respectively connected to different data input pins of the controller.

Preferably, there are three expansion circuits, and the three expansion circuits collect 23 ADC signals in total.

Preferably, the decoder is a 38-decoder.

Preferably, the ADC signal includes a switching value signal, a vehicle speed signal, a tire pressure signal.

The utility model has the beneficial effects that:

the utility model can realize the reading of 23 paths of ADC signals by arranging a plurality of extension circuits at the signal input end of the controller and adopting a common CPU, and does not need to replace an expensive CPU containing more I/O ports, thereby effectively reducing the hardware cost, simplifying the circuit, improving the reading efficiency of the ADC signals and releasing the resources of the CPU.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic block diagram of the circuit of the present invention.

Detailed Description

For better understanding of the technical solutions of the present invention, the following detailed descriptions of the embodiments of the present invention are provided with reference to the accompanying drawings.

It should be understood that the described embodiments are only some embodiments of the utility model, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The present application is described in further detail below with reference to specific embodiments and with reference to the attached drawings.

In the description of the present application, unless explicitly stated or limited otherwise, the terms "first", "second", and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more unless specified or indicated otherwise; the term "connected" is to be understood broadly, for example, "connected" may be an electrical connection; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The utility model provides an I/O port expansion circuit of a vehicle-mounted intelligent controller, which comprises a controller and an expansion circuit.

The expansion circuit is provided with a plurality of expansion circuits, and each expansion circuit comprises an ADC sampling circuit for collecting a plurality of paths of ADC signals and a decoder connected with a signal output port of the ADC sampling circuit.

After the enable pins of all decoders are connected together, the enable pins are connected together to the enable pin of the controller.

After the address pins of the corresponding positions of all the decoders are connected together, the address pins of the corresponding positions of all the decoders are connected together.

In this embodiment, there are three expansion circuits, the three expansion circuits collect 23 ADC signals, the decoder in each expansion circuit is a 38 decoder, and the 38 decoder has an EN pin (enable pin), three address pins, and an OUT pin (data output pin).

The ADC sampling circuits in the three expansion circuits are respectively an ADC sampling circuit 1, an ADC sampling circuit 2 and an ADC sampling circuit 3, and the decoders are respectively a decoder 1, a decoder 2 and a decoder 3, wherein signal output ports of the ADC sampling circuit 1 are respectively connected with expansion ports Y0-Y7 of the decoder 1 in a one-to-one correspondence manner, similarly, signal output ports of the ADC sampling circuit 2 are respectively connected with expansion ports Y0-Y7 of the decoder 2 in a one-to-one correspondence manner, and signal output ports of the ADC sampling circuit 3 are respectively connected with expansion ports Y0-Y7 of the decoder 3 in a one-to-one correspondence manner.

In this embodiment, the controller has 7I/O ports, including three address pins, three OUT pins (data input pins with ADC function), and one EN pin (enable pin).

The first address pins of the three decoders are connected together and then connected to the corresponding first address pins of the controller, and similarly, the second address pins of the three decoders are connected together and then connected to the corresponding second address pins of the controller; the third address pins of the three decoders are connected together and then connected to the corresponding third address pins of the controller.

After the EN pins of the three decoders are connected together, the EN pins of the three decoders are connected together to the EN pin of the controller.

The OUT pins of the three decoders are respectively connected to three OUT pins of the controller, that is, the OUT pin of the decoder 1 is connected to a first OUT pin of the controller, the OUT pin of the decoder 2 is connected to a second OUT pin of the controller, and the OUT pin of the decoder 3 is connected to a third OUT pin of the controller.

The ADC sampling circuit 1 collects 1-8 paths of ADC signals, and the ADC sampling circuit 1 sends the 8 paths of ADC signals to expansion ports Y0-Y7 of the decoder 1; 9-16 paths of CAD signals are acquired by the ADC sampling circuit 2, and the ADC sampling circuit 2 sends the 8 paths of ADC signals to expansion ports Y0-Y7 of the decoder 2; the ADC sampling circuit 3 collects 17-23 paths of CAD signals, and the ADC sampling circuit 3 sends the 8 paths of ADC signals to expansion ports Y0-Y7 of the decoder 3.

After the EN pin of the controller is powered on, the three address pins of the controller can be combined into 8 modes through high-low level configuration, and data received by the Y0-Y7 expansion ports of the 3 decoders are sequentially read, for example, if the level of the three address pins of the controller is 000, ADC signals received by the YO expansion ports of the 3 decoders are read, the ADC signals received by the 3 decoders are respectively transmitted to the controller through respective OUT pins of the 3 decoders, and the controller executes related operations to control corresponding devices; if the level of three address pins of the controller is 111, the ADC signals received by the expansion ports of the 3 decoders Y7 are read, the 3 decoders respectively transmit the received ADC signals to the controller through their respective OUT pins, and the controller executes related operations to control corresponding devices.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. An I/O port expansion circuit of a vehicle-mounted intelligent controller is characterized by comprising a controller and an expansion circuit,

2. The vehicle-mounted intelligent controller I/O port expansion circuit according to claim 1, wherein three expansion circuits are provided, and 23 ADC signals are collected by the three expansion circuits.

3. The vehicle-mounted intelligent controller I/O port expansion circuit according to claim 1, wherein the decoder is a 38 decoder.

4. The on-board intelligent controller I/O port expansion circuit of claim 1, wherein the ADC signal comprises a switching value signal, a vehicle speed signal, a tire pressure signal.