Level convert of serial port
A level converter and serial port technology, applied in the field of serial port level converters, can solve the problems of no transient voltage protection circuit, high cost of protocol conversion chip, no better transient voltage protection circuit, etc., and achieve simple circuit structure , protect the conversion circuit, and reduce the production cost
Pending Publication Date: 2019-01-01
黔东南民族职业技术学院
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Problems solved by technology
At present, there are generally two solutions, one is to directly integrate the serial port to USB protocol chip into the embedded motherboard, such as FT232, CH340 or PL2302, etc. This method is convenient and fast, but the cost of the protocol conversion chip is high, increasing Embedded system hardware cost without good transient voltage protection circuit
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[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0028] The terms "comprising" and "having" and any variations thereof in the description and claims of the present invention and the drawings are intended to cover a non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but optionally also includes unlisted steps or units, or optionally further includes For other steps or units inherent in th...
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The invention provide a level convert of a serial port for level convert between MCU and RS232. The invention is characterized in that the convert comprisesa first convert circuit, a second convertingcircuit, a common circuit and a protection circuit. The first conversion circuit comprises a PNP type transistor and a first current limiting member. The second conversion circuit comprises an NPN-type transistor and a second current limiting member. The common circuit includes: a cathode electrically connected to a fifth capacitor of the first conversion circuit; The protection circuit includesa first bi-directional TVS transistor electrically connected to the first conversion circuit and a second bi-directional TVS transistor electrically connected to the second conversion circuit. As thatlevel conversion is carry out by using independent electronic component, the circuit structure is simple on the premise that the communication quality of the serial port is guaranteed, and in addition, a protection circuit is arranged to form a multi-level protection, prevent transient pulse and effectively protect the conversion circuit, and meanwhile, the hardware production cost of the embedded system is reduced.
Description
technical field [0001] The invention relates to the technical field of computer hardware transmission, in particular to a serial port level converter. Background technique [0002] In the development of embedded systems, the operating voltage of many MCUs is as low as 3.3V. When debugging or downloading programs, it is necessary to level-shift and invert the 3.3V CMOS serial port signals to meet the RS232 level standard. , and ensure that it is not easily damaged during regular plugging and unplugging. At present, there are generally two solutions, one is to directly integrate the serial port to USB protocol chip into the embedded motherboard, such as FT232, CH340 or PL2302, etc. This method is convenient and fast, but the cost of the protocol conversion chip is high, increasing Embedded system hardware costs, and there is no better transient voltage protection circuit. The other is to use a dedicated level conversion chip to convert 3.3V CMOS level to RS232 level, such as...
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IPC IPC(8): G06F13/38G06F13/42
CPCG06F13/382G06F13/4282
Inventor 陈克林刘杰宋开旭袁佳
Owner 黔东南民族职业技术学院