CN105321306A

CN105321306A - IIC extended IO port-based alarm module circuit

Info

Publication number: CN105321306A
Application number: CN201410361644.3A
Authority: CN
Inventors: 王大刚
Original assignee: Individual
Current assignee: Individual
Priority date: 2014-07-28
Filing date: 2014-07-28
Publication date: 2016-02-10

Abstract

The invention discloses an IIC extended IO port-based alarm module circuit. The IIC extended IO port-based alarm module circuit includes an IIC extended IO integrated circuit group and an alarm group; the IIC extended IO integrated circuit group includes a plurality of IIC extended IO integrated circuits; and a microprocessor is electrically connected with the IIC extended IO integrated circuit group through an IIC bus. According to the IIC extended IO port alarm module circuit of the invention, based on the extension function of the IIC bus, problems can be solved correspondingly with one IIC clock line and an IIC data line pulled from the microprocessor required no matter how many warning signals are connected; connection lines between boards in split board design can be greatly optimized, and since connection signal lines are decreased, the alarm module circuit can be individually designed into a sub board, and therefore, the alarm module circuit can be debugged separately, and mass production of the alarm module circuits can be realized. The alarm module circuit can be universally used design, and therefore, design and debugging cost can be greatly reduced.

Description

I/O port alarm module circuitry is expanded based on IIC

Technical field

The present invention relates to a kind of based on IIC expansion I/O port alarm module circuitry.

Background technology

At present, what adopt in the warning circuit design of monitoring trade is all directly from the IO port access warning input/output signal of device handler, warning input and output type just fixing in the design, the later stage changes to be needed to redesign from design; Need to use in point plate design at the watch-dog of small size, realize remote alarm interface in this way, connect existing to complexity between plate, the stability of warning circuit is influenced; Simultaneously in extensive Full Featured watch-dog because the pin of multiplexing IO port all can not do I/O port use, likely there is the situation that I/O port is not enough.

Summary of the invention

For above-mentioned prior art Problems existing, the invention provides a kind of based on IIC expansion I/O port alarm module circuitry.

To achieve these goals, the technical solution used in the present invention is: a kind of based on IIC expansion I/O port alarm module circuitry, comprise microprocessor, also comprise IIC and expand IO integrated circuit group and alarm group, IIC expands IO integrated circuit group and comprises several IIC expansion IO integrated circuit, and microprocessor is expanded IO integrated circuit group through iic bus with IIC and is electrically connected.

Compared with prior art, the invention has the advantages that: the expanded function utilizing iic bus, the quantity of the alerting signal no matter accessed, only need to draw the clock of two IIC and data line just can correspondence to deal with problems from microprocessor.Optimize in point plate design, between plate, connecting line meeting is a large amount of especially, simultaneously because this alarm module circuitry can be designed to daughter board separately by connection signal line less, independent debugging and a large amount of production, use in the design that can be general, greatly reducing design and debugging cost.

Accompanying drawing explanation

Fig. 1 is structural representation of the present invention;

Fig. 2 is electrical block diagram of the present invention.

Embodiment

Below in conjunction with accompanying drawing, the invention will be further described.

As one embodiment of the present invention, consult Fig. 1 and Fig. 2, the present invention includes microprocessor, also comprise IIC and expand IO integrated circuit group and alarm group, IIC expands IO integrated circuit group and comprises several IIC expansion IO integrated circuit, and microprocessor is expanded IO integrated circuit group through iic bus with IIC and is electrically connected.

The iic bus that microprocessor is expanded by standard between I/O port integrated circuit with IIC is connected, due to the feature that IIC is bus, therefore expanded function can be fully utilized, as long as ensure that IIC expands I/O port integrated circuit and IIC expands between I/O port integrated circuit, IIC expands I/O port integrated circuit and does not conflict with the address between other IIC devices, can expand according to actual needs.IIC is expanded I/O port integrated circuit and is connected by I/O port with between warning circuit.

Consulting Fig. 2 is the exemplary reference that application IIC expands that I/O port integrated circuit PCF8574ADWR carries out corresponding design, and in figure, J1 is the 4pin connector between subcard and motherboard, U1IIC expands I/O port integrated circuit, R1, R2 are pull-up resistor, and C1 is the decoupling capacitor that IC powers.The IIC address configuration pin that 1,2, the 3 pin corresponding A [0:2] of PCF8574ADWR are PCF8574ADWR, can guarantee arbitrary disposition under the prerequisite of not conflicting in each IIC address; 4,5,6,7,9,10,11,12 pin are the I/O port of expansion, in example, [9:12] are used input of reporting to the police, and [4:7] uses output of reporting to the police; The clock of the corresponding IIC signal of 14,15 pin is connected with motherboard corresponding joints by J1 with data line, and J1 provides the power supply of 3.3V, and datum GND altogether.

Although be recognized as a most practical and preferred embodiment to describe the present invention in conjunction with current, but be to be understood that, the invention is not restricted to the disclosed embodiments, and be intended on the contrary contain multiple amendment included in the spirit and scope of the appended claims and equivalent arrangements.

Claims

1. expand I/O port alarm module circuitry based on IIC for one kind, comprise microprocessor, it is characterized in that: also comprise IIC and expand IO integrated circuit group and alarm group, described IIC expands IO integrated circuit group and comprises several IIC expansion IO integrated circuit, and described microprocessor is expanded IO integrated circuit group through iic bus with IIC and is electrically connected.