Power supply management circuit and method for MCU chip
A power management and circuit technology, applied in data processing power supply, electrical digital data processing, digital data processing components and other directions, can solve the problems of high cost and large power system area, avoid self-locking, reduce area and reduce cost Effect
Active Publication Date: 2020-01-10
上海灵动微电子股份有限公司
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Problems solved by technology
[0006] The purpose of the present invention is to provide a kind of power management circuit and method for MCU chip, solve the problem that the area of the power supply system of existing MCU chip is big, cost is high
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[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation manners of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention, and those skilled in the art can obtain other accompanying drawings based on these drawings and obtain other implementations.
[0029] In order to make the drawing concise, each drawing only schematically shows the parts related to the present invention, and they do not represent the actual structure of the product. In addition, to make the drawings concise and easy to understand, in some drawings, only one of the components having the same structure or function is schematically shown, or only one of them is marked. Herein, "a" not only means "only one", but also means "more than one".
[0030] In another...
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The invention provides a power management circuit and method for an MCU chip, and the circuit comprises a first power module which is used for providing a first voltage power supply and supplying power to the MCU chip in a dormant state; a second power supply module, used for providing a second voltage power supply and supplying power to the MCU chip in the non-dormant state; a power supply management module, adopting a low-voltage logic design and being used for controlling switching of power supply modes; a level conversion module, used for outputting an effective high-voltage enable signalwhen the first voltage power supply is invalid; a high-voltage enable signal, controlling the second power supply module to generate a second voltage power supply. When the second voltage power supplyis effective, the switch unit is switched on, and the second voltage power supply and the first voltage power supply are short-circuited. According to the invention, the area and the cost of the power supply system of the MCU chip are reduced, and meanwhile, the power supply system has the advantage of power-on quick start.
Description
technical field [0001] The invention relates to the field of single-chip microcomputers, in particular to a power management circuit and method for MCU chips. Background technique [0002] The power supply system of the MCU (Micro Controller Unit, referred to as microcontroller unit, also known as single-chip microcomputer) chip is very important, and it is usually hoped that the power supply system can complete the function with the smallest area to reduce the cost. [0003] The power supply structure of traditional MCU is as follows: Figure 5 As shown, among them, BGR1 is an ultra-low power consumption bandgap reference source, LDO1 is a low-dropout linear regulator, and BGR1+LDO1 provides the first power supply of 1.5V (A), which is characterized by poor accuracy and long start-up time ( For example, 10mS), the power consumption is very low, so it is always on. BGR2+LDO2 provides a second power supply of 1.5V (B), which is characterized by high precision and fast startu...
Claims
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Login to View More IPC IPC(8): G06F1/26
CPCG06F1/263
Inventor 唐成伟
Owner 上海灵动微电子股份有限公司