CN208384561U

CN208384561U - PCIE RS 232 serial port circuit

Info

Publication number: CN208384561U
Application number: CN201821060011.9U
Authority: CN
Inventors: 王春华
Original assignee: JIANGSU QINHENG CO Ltd
Current assignee: Nanjing qinheng Microelectronics Co.,Ltd.
Priority date: 2018-07-05
Filing date: 2018-07-05
Publication date: 2019-01-15
Anticipated expiration: 2028-07-05

Abstract

The utility model discloses a kind of PCIE RS 232 serial port circuits, including PCIE interface, PCIE to turn TTL serial port module, power management module, level switch module and RS232 interface；The PCIE interface turns TTL serial port module with the PCIE respectively and the power management module is electrically connected, the PCIE turns TTL serial port module and is electrically connected with the level switch module, the power management module is electrically connected with the level switch module, and the level switch module is electrically connected with the RS232 interface.The utility model structure is simple, operation stability is good, effectively reduces cost, is suitable for being widely applied.

Description

PCIE RS 232 serial port circuit

Technical field

The utility model relates to a kind of PCIE RS 232 serial port circuits, belong to technical field of integrated circuits.

Background technique

PCI-Express (Peripheral Component Interconnect Express) is a kind of high speed serialization Computer expansion bus standard, abbreviation PCI-e, PCI-E or PCIE, main advantage are exactly message transmission rate height.

At present the product of PCIE RS 232 serial ports be all made of PCIE turn TTL serial port chip cooperation TTL RS 232 level The scheme (such as Fig. 1) of the conversion chip, (multichannels such as TTL RS 232 electrical level transferring chip such as MAX232, MAX3245 of mainstream RS-232 line driver/receiver) work when need to cooperate multiple external capacitives, using " charge pump " principle, pass through capacitor Charge and discharge generate negative voltage source come meet 232 level demand.Such conversion chip structure is complex, high failure rate；Electricity Container service life in the environment of the long term high temperatures such as cabinet, high dust is lower, is unfavorable for the operation steady in a long-term of product.

Utility model content

To solve the above-mentioned problems, the utility model provides a kind of PCIE RS 232 serial port circuit, and structure is simple, stablizes Property it is good and cost can be effectively reduced.

The technical solution to solve the above problems are as follows: a kind of PCIE RS 232 serial port circuit, including PCIE interface, PCIE turn TTL serial port module, power management module, level switch module and RS232 interface；The PCIE interface turns with the PCIE respectively TTL serial port module and power management module electrical connection, the PCIE turn TTL serial port module and level switch module electricity Connection, the power management module are electrically connected with the level switch module, the level switch module and the RS232 interface Electrical connection.Power management module, this setting enable power management module to provide negative supply for the electrical level transferring chip. Without using a large amount of external capacitors, and the negative 5V that provides than in the prior art of its negative 12V voltage generated to negative 7V voltage more It is applicable in, stability is more preferable.

Further, the PCIE turns TTL serial port module and is electrically connected with two-way or two-way the above level switch module, The power management module is electrically connected with two-way or two-way the above level switch module, level conversion described in any road Module is electrically connected with a RS232 interface respectively.When route is more, what the stability and saving cost of the utility model embodied It becomes apparent.

Preferably, the power management module is circuit for generating negative voltage, this setting enables power management module Negative supply is provided for the electrical level transferring chip, while former positive supply directly uses, instead of a large amount of used in the prior art Capacitor generates negative level, and stability is more preferable.

Preferably, the power management module is switching power source chip, provides negative supply for the electrical level transferring chip.Energy Enough reach the same effect of circuit for generating negative voltage.

Further, the level switch module is electrical level transferring chip, turns the serial ports of TTL serial port module with the PCIE Electrical connection.

Further, the electrical level transferring chip is 75232 chips.

Preferably, it includes that PCIE turns PCI chip and PCI turns TTL serial port chip that the PCIE, which turns TTL serial port module, described PCIE interface turns PCI chip with the PCIE and is electrically connected, and the PCIE turns PCI chip and turn TTL serial port chip with the PCI to be electrically connected It connects, the PCI turns TTL serial port chip and is electrically connected with the level switch module.This setting can be while maintaining effect It is effectively reduced cost.

Preferably, it is that PCIE turns serial port chip, such as CH382/CH384 that the PCIE, which turns TTL serial port module,.

The PCIE interface is that PCIE is inserted into card pin (PCIE Add-In Card Pinouts), is commonly called as " golden finger ".

Utility model has the advantages that the setting of power management module and level switch module, be substituted MAX232, MAX3245 etc. (multichannel RS-232 line driver/receiver) needs to cooperate the chip of multiple external capacitives when working, save A large amount of capacitors；The lower negative voltage of positive voltage for solving such chip conversion simultaneously is higher, can not communicate, be communicated not over long distances Stable problem；

It needs to cooperate multiple external capacitives when eliminating work, so that the stability of entire circuit is more excellent；

Circuit for generating negative voltage or switching power source chip all have lower-cost chip alternative, and therefore, this is practical It is novel to also save cost under the premise of guaranteeing circuit stability；

Suitable for being widely applied.

The utility model is described in further detail with reference to the accompanying drawing.

Detailed description of the invention

Fig. 1 is the structural schematic diagram of the prior art；

Fig. 2 is the utility model structure diagram；

Fig. 3 is the circuit diagram of one preferred embodiment 1 of the utility model；

Fig. 4 is the circuit diagram of one preferred embodiment 2 of the utility model；

Fig. 5 is the circuit diagram of one preferred embodiment 3 of the utility model.

Specific embodiment

In order to deepen the understanding to the utility model, the utility model is made below in conjunction with embodiment and attached drawing further It is described in detail, which is only used for explaining the utility model, does not constitute the restriction to scope of protection of the utility model.

Referring to fig. 2 shown in -5, a kind of PCIE RS 232 serial port circuit provided by the utility model, including PCIE interface, PCIE turns TTL serial port module, power management module, level switch module and RS232 interface；The PCIE interface respectively with it is described PCIE turns TTL serial port module and power management module electrical connection, and the PCIE turns TTL serial port module and the level conversion Module electrical connection, the power management module is electrically connected with the level switch module, the level switch module with it is described RS232 interface electrical connection.

Preferably, it is that PCIE turns serial port chip that the PCIE, which turns TTL serial port module,；

Or turning PCI chip including PCIE and PCI turns TTL serial port chip, the PCIE interface and the PCIE turn PCI core Piece electrical connection, the PCIE turn PCI chip and turn TTL serial port chip with the PCI to be electrically connected, the PCI turn TTL serial port chip and The level switch module electrical connection.

Preferably, it is that PCIE turns serial port chip that the PCIE, which turns TTL serial port module,.

Embodiment 1: power management module has selected circuit for generating negative voltage；

Such as Fig. 3, PCIE insertion card pin and PCIE turn serial port chip CH382 (chip are that the situation of selling well of applicant company produces Product) it is connected, the serial ports O that PCIE turns serial port chip CH382 is electrically connected with the chip 75232 in a level switch module, negative electricity Pressure generation circuit 7660A provides negative supply for 75232, and 75232 are electrically connected with a RS232 interface；PCIE turns serial port chip CH382 Serial ports 1 be electrically connected with the chip 75232 in another level switch module, circuit for generating negative voltage 7660A be 75232 provide it is negative Power supply, 75232 are electrically connected with another RS232 interface；The positive supply of system directly uses.

When circuit for generating negative voltage selects 7660, can first be depressured, then provide negative supply for 75232.

Embodiment 2: power management module has selected a switching power source chip MC34063；

Such as Fig. 4, PCIE insertion card pin and PCIE turn serial port chip CH384 (chip are that the situation of selling well of applicant company produces Product) it is connected, the serial ports O that PCIE turns serial port chip CH384 is electrically connected with the chip 75232 in a level switch module, switch Power supply chip MC34063 provides negative supply for it, and 75232 are electrically connected with a RS232 interface；PCIE turns serial port chip CH384's Serial ports 1 is electrically connected with the chip 75232 in another level switch module, and switching power source chip MC34063 provides negative supply for it, 75232 are electrically connected with another RS232 interface.

Embodiment 3: power management module has selected circuit for generating negative voltage；PCIE turns TTL serial port module and has selected PCIE Turn PCI chip and PCI turns TTL serial port chip；

As shown in figure 5, PCIE insertion card pin turns PCI chip with PCIE and is electrically connected, PCIE turns PCI chip and PCI turns TTL Serial port chip CH351 (for one of the product of applicant, there are also CH352 etc. for the product of same type, can optionally be replaced) electricity Connection, the serial ports O of CH351 are electrically connected with the chip 75232 in a level switch module, and circuit for generating negative voltage 7660A is it Negative supply is provided, 75232 are electrically connected with a RS232 interface；The serial ports 1 and the chip in another level switch module of CH351 75232 electrical connections, circuit for generating negative voltage 7660A provide negative supply for it, and 75232 are electrically connected with another RS232 interface.

The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this Within the spirit and principle of utility model, any modification, equivalent replacement, improvement and so on should be included in the utility model Protection scope within.

Claims

1. a kind of PCIE RS 232 serial port circuit, it is characterised in that: turn TTL serial port module, power supply including PCIE interface, PCIE Management module, level switch module and RS232 interface；The PCIE interface turns TTL serial port module, described with the PCIE respectively Power management module electrical connection, the PCIE turn TTL serial port module and are electrically connected with the level switch module, the power management Module is electrically connected with the level switch module, and the level switch module is electrically connected with the RS232 interface.

2. PCIE RS 232 serial port circuit according to claim 1, it is characterised in that: the PCIE turns TTL serial port module It is electrically connected with two-way or two-way the above level switch module, the power management module and two-way or two-way electricity described above Flat conversion module is electrically connected, and level switch module described in any road is electrically connected with a RS232 interface respectively.

3. PCIE RS 232 serial port circuit according to claim 2, it is characterised in that: the power management module is negative Voltage generation circuit provides negative supply for the electrical level transferring chip.

4. PCIE RS 232 serial port circuit according to claim 2, it is characterised in that: the power management module is to open Powered-down source chip provides negative supply for the electrical level transferring chip.

5. PCIE RS 232 serial port circuit according to claim 2, it is characterised in that: the level switch module is electricity Flat conversion chip is electrically connected with the PCIE serial ports for turning TTL serial port module.

6. PCIE RS 232 serial port circuit according to claim 5, it is characterised in that: the electrical level transferring chip is 75232 chips.

7. PCIE RS 232 serial port circuit according to claim 2, it is characterised in that: the PCIE turns TTL serial port module Turn serial port chip for PCIE；

Or turning PCI chip including PCIE and PCI turns TTL serial port chip, the PCIE interface and the PCIE turn PCI chip electricity Connection, the PCIE turn PCI chip and turn TTL serial port chip with the PCI to be electrically connected, the PCI turn TTL serial port chip with it is described Level switch module electrical connection.

8. PCIE RS 232 serial port circuit described in any one of -7 according to claim 1, it is characterised in that: the PCIE connects Mouth is that PCIE is inserted into card pin.