Power supply protection system and method for single chip microcomputer

Abstract

The invention discloses a system and a method for protecting power sources of a single chip microcomputer. The system comprises a control chip, the single chip microcomputer and external equipment. The control chip is electrically connected with the single chip microcomputer and the external equipment and is used for converting external input voltages into first voltages and second voltages, the first voltages correspond to the single chip microcomputer, and the second voltages correspond to the external equipment; the single chip microcomputer is electrically connected with the control chip and is used for receiving the first voltages transformed by the control chip; the external equipment is electrically connected with the control chip and is used for receiving the second voltages transformed by the control chip. The system and the method have the advantage that technical problems of high design cost and large occupied printed circuit board (PCB) areas due to the fact that voltage monitoring circuits and watchdog circuits are required to be individually designed in the prior art can be solved by the aid of the system and the method.

Description

technical field [0001] The invention relates to the technical field of electrical applications, in particular to a single-chip microcomputer power supply protection system and method. Background technique [0002] With the widespread use of single-chip microcomputer technology, according to the provisions of the International Electrotechnical Commission's 61508 agreement (International Electrotechnical Commission, referred to as IEC61508), in functional safety products, the power supply voltage and program operation of the minimum system of the single-chip microcomputer must be monitored to meet safety requirements. . In the related art, the core power supply voltage of most single-chip microcomputers is 1.2V or 1.8V, the I / O port power supply voltage is 3.3V, and the peripheral power supply voltage is 5V. Therefore, it is necessary to provide multi-standard safe power supplies for the smallest single-chip microcomputer system to meet the requirements. The current common so...

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Problems solved by technology

[0006] The embodiment of the present invention provides a power supply protection system and method for a single-chip microcomputer to at least solve the problem that the voltage monitoring circuit and the watchdog circuit of the related art need to be designed separately, resulting in high design costs and occupying a large area of ​​the printed circuit board PCB. question

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