CN-224203662-U - MCU's power supply circuit and controller

Abstract

The application provides a power supply circuit and a controller of an MCU (micro control unit), and relates to the technical field of power supply time sequence control. The resistance ratio of the second resistor to the third resistor is equal to the resistance ratio of the fourth resistor to the first resistor, and the potential of the tracking pin of the power supply module is the same as the output voltage of the reference source, namely, the potential of the connection point of the second resistor and the third resistor is equal to the potential of the connection point of the fourth resistor and the first resistor, so that the sum of the divided voltage of the fourth resistor and the divided voltage of the first resistor is equal to the sum of the divided voltage of the second resistor and the divided voltage of the third resistor, the output voltage of the first output pin of the power supply module is equal to the output voltage of the second output pin of the power supply module, namely, the tracking of the output voltage of the first output pin to the output voltage of the second output pin is realized, and the output voltage of the first output pin reaches a set value before the output voltage of the second output pin, so that the MCU kernel is electrified before the I/O module of the MCU.

Inventors

• LI KUN
• HE ZHIWEN

Assignees

• 北京润科通用技术有限公司

Dates

Publication Date

20260505

Application Date

20250527

Claims (10)

1. 1. The power supply circuit of the MCU is characterized by comprising a power supply module, a first resistor, a second resistor and a third resistor, wherein: the first output pin pair of the power supply module is externally connected with the power supply end of the inner core of the MCU, and the second output pin pair of the power supply module is externally connected with the power supply end of the I/O module of the MCU; the first output pin pair is internally connected with a reference source inside the power supply module and a first output feedback pin of the power supply module through a fourth resistor; the first output feedback pin of the power supply module is grounded through the first resistor; The second output pin is further grounded through the second resistor and the third resistor in turn, and a connection point of the second resistor and the third resistor is connected to a tracking pin of the power supply module; the potential of the tracking pin is the same as the output voltage of the reference source; And the resistance ratio of the second resistor to the third resistor is equal to the resistance ratio of the fourth resistor to the first resistor.
2. 2. The MCU power supply circuit of claim 1, wherein the first enable control pin of the power module is connected to the first output indication pin of the power module; The first output indication pin is a pin which outputs a signal with a potential being a target level when an output channel where the second output pin is located is in an open state, and the first enabling control pin is a pin which enables the output channel where the first output pin is located to be in an open state when the first enabling control pin receives the signal with the potential being the target level.
3. 3. The MCU power supply circuit of claim 1 or 2, further comprising a fifth resistor, wherein: one end of the fifth resistor is connected with a second output feedback pin of the power supply module; The second output feedback pin is used for adjusting the potential of the second output pin according to the self potential.
4. 4. A power supply circuit for an MCU according to claim 1 or 2, wherein the fourth resistor is a precision resistor.
5. 5. The power supply circuit of the MCU according to claim 1 or 2, wherein the first input pin of the power module is externally connected to the output terminal of the first power supply; The second input pin of the power supply module is externally connected with the output end of the second power supply.
6. 6. The MCU power supply circuit of claim 5, wherein the first power supply and the second power supply are the same power supply.
7. 7. The power supply circuit of an MCU according to claim 1 or 2, wherein the power supply module is further provided with a second enable control pin; the second enabling control pin is a pin for controlling the opening and closing states of the output channel where the second output pin is located according to the high and low levels of the signals received by the second enabling control pin.
8. 8. The power supply circuit of an MCU according to claim 1 or 2, wherein the power supply module is further provided with a second output indication pin; the second output indication pin is a pin which outputs a signal with a corresponding level according to the open-close state of the output channel where the first output pin is located so as to represent the open-close state of the output channel where the first output pin is located.
9. 9. A controller comprising an MCU and a power supply circuit for the MCU according to any one of claims 1 to 8.
10. 10. The controller of claim 9, wherein the MCU is a digital signal processing chip.

Description

MCU's power supply circuit and controller Technical Field The utility model relates to the technical field of power supply time sequence control, in particular to a power supply circuit and a controller of an MCU. Background When the MCU (Microcontroller Unit, the micro control unit) works, two paths of power supplies are usually needed for supplying power, one path supplies power to the core of the MCU, and the other path supplies power to the I/O module of the MCU. In the process of MCU power-on starting, if the I/O module of MCU is powered on before the kernel of MCU, the transistors in the output buffer of the I/O module are possibly turned on and possibly turned off because the kernel of MCU does not start working at the moment, namely the output pins of the I/O module are in an uncertain state, and thus the MCU is possibly caused to start abnormally. Therefore, how to power up the core of the MCU before the I/O module of the MCU is a technical problem to be solved. Disclosure of utility model In view of this, the present utility model provides a power supply circuit and a controller for an MCU to power up the core of the MCU prior to the I/O module of the MCU. In order to achieve the above object, the embodiment of the present utility model provides the following technical solutions: The application provides a power supply circuit of an MCU, which comprises a power supply module, a first resistor, a second resistor and a third resistor, wherein: the first output pin pair of the power supply module is externally connected with the power supply end of the inner core of the MCU, and the second output pin pair of the power supply module is externally connected with the power supply end of the I/O module of the MCU; the first output pin pair is internally connected with a reference source inside the power supply module and a first output feedback pin of the power supply module through a fourth resistor; the first output feedback pin of the power supply module is grounded through the first resistor; The second output pin is further grounded through the second resistor and the third resistor in turn, and a connection point of the second resistor and the third resistor is connected to a tracking pin of the power supply module; the potential of the tracking pin is the same as the output voltage of the reference source; And the resistance ratio of the second resistor to the third resistor is equal to the resistance ratio of the fourth resistor to the first resistor. Optionally, a first enabling control pin of the power module is connected with a first output indication pin of the power module; The first output indication pin is a pin which outputs a signal with a potential being a target level when an output channel where the second output pin is located is in an open state, and the first enabling control pin is a pin which enables the output channel where the first output pin is located to be in an open state when the first enabling control pin receives the signal with the potential being the target level. Optionally, the circuit further comprises a fifth resistor, wherein: one end of the fifth resistor is connected with a second output feedback pin of the power supply module; The second output feedback pin is used for adjusting the potential of the second output pin according to the self potential. Optionally, the fourth resistor is a precision resistor. Optionally, the first input pin of the power module is externally connected with the output end of the first power supply; The second input pin of the power supply module is externally connected with the output end of the second power supply. Optionally, the first power supply and the second power supply are the same power supply. Optionally, the power module is further provided with a second enabling control pin; the second enabling control pin is a pin for controlling the opening and closing states of the output channel where the second output pin is located according to the high and low levels of the signals received by the second enabling control pin. Optionally, the power module is further provided with a second output indication pin; the second output indication pin is a pin which outputs a signal with a corresponding level according to the open-close state of the output channel where the first output pin is located so as to represent the open-close state of the output channel where the first output pin is located. In another aspect, the application provides a controller comprising an MCU and a power supply circuit for the MCU according to any of the previous aspects of the application. Optionally, the MCU is a digital signal processing chip. As can be seen from the technical scheme, the utility model provides a power supply circuit of an MCU. The resistance ratio of the second resistor to the third resistor is equal to the resistance ratio of the fourth resistor to the first resistor, and the potential of the tracking pin of the power module is the sam