Multi-signal reset device

Abstract

The utility model discloses a multi-signal reset device, and relates to the technical field of signal reset devices.The device comprises a main control chip, a capacitor, a plurality of diodes and a plurality of resistors, the capacitor, the diodes and the resistors are connected with the main control chip, and the cathode of each diode forms the input end of a reset signal; the cathode of the common anode diode V11 is connected with the fifth pin of the main control chip, and the cathode of the common anode diode V12 is connected with the eighth pin of the main control chip; the anodes of the common-anode diode V11 and the common-anode diode V12 are connected with a first pin of the main control chip; two ends of the capacitor are respectively connected with a second pin and a third pin of the main control chip; one end of the resistor R206 and one end of the resistor R207 are connected with a fourth pin of the main control chip; the circuit supports a wide input reset signal level of 2.5 V-28V, does not need any level conversion, is suitable for various systems, and is high in compatibility; and meanwhile, four reset signal inputs are supported, and the diode scheme is low in cost.

Description

Technical Field

[0001] This invention relates to the field of signal reset device technology, and more specifically, to a multi-signal reset device. Background Technology

[0002] With the continuous updating and development of electronic technology and increasingly complex application systems, reset signals have become more and more complex and important in the entire system. The application of multiple reset signals in system board design has become more and more common. However, most signal reset devices currently suffer from high cost and limited reset signals. Summary of the Invention

[0003] The purpose of this invention is to provide a multi-signal reset device to solve the problems existing in the background art.

[0004] The above technical objectives of the present invention are achieved through the following technical solutions:

[0005] This application provides a multi-signal reset device, including a main control chip, a capacitor C369, multiple diodes, and multiple resistors connected to the main control chip, wherein the cathodes of each diode form the input terminals of the reset signal.

[0006] Based on the above technical solution, the present invention can be further improved as follows.

[0007] Furthermore, the model of the aforementioned main control chip is SM706T.

[0008] Furthermore, the aforementioned diodes are common anode diodes, and the number of common anode diodes is 2, including common anode diode V11 and common anode diode V12.

[0009] Furthermore, the number of the above resistors is 3, including resistor R205, resistor R206 and resistor R207.

[0010] Furthermore, the input terminals of the aforementioned reset signal include a first port, a second port, a third port, and a fourth port.

[0011] Furthermore, the second port formed by the common anode diode V11 is connected to the PFO pin of the main control chip, and the third port formed by the common anode diode V12 is connected to the WDO pin of the main control chip; the anodes of both the common anode diode V11 and the common anode diode V12 are connected to the MR pin of the main control chip.

[0012] Furthermore, the two ends of the aforementioned capacitor C369 are connected to the VCC pin and GND pin of the main control chip, respectively.

[0013] Furthermore, the two ends of the aforementioned resistor R205 are connected to the MR pin and VCC pin of the main control chip, respectively.

[0014] Furthermore, one end of resistor R206 and one end of resistor R207 are both connected to the PFI pin of the main control chip; the other end of resistor R206 is connected to the 12V power supply terminal, and the other end of resistor R207 is grounded.

[0015] Furthermore, the resistance values ​​of resistors R205, R206, and R207 are 4.7kΩ, 10kΩ, and 1.3kΩ, respectively; the capacitance value of resistor C369 is 0.1uF.

[0016] Compared with the prior art, the present invention has at least the following beneficial effects:

[0017] In this application, a low-cost solution supporting four reset signal inputs is formed using a main control chip SM706T, three resistors, one capacitor, and two common-anode diodes. The main control chip SM706T is a microprocessor monitoring circuit used to monitor the microprocessor's 3.3V operating power supply. Through its connection with the three resistors, one capacitor, and two common-anode diodes, it provides functions such as reset, watchdog timer, and power error indication signals. When the microprocessor's 3.3V operating power supply is below 3.15V, the main control chip SM706T outputs a 100ms low-level reset signal at pin 7 (RESET) to stabilize and reset the microprocessor system. When a low level is input at pin 1 (MR) of the main control chip SM706T, the main control chip SM706T outputs a 100ms low-level reset signal at pin 7 (RESET) to stabilize and reset the microprocessor system. Attached Figure Description

[0018] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the drawings:

[0019] Figure 1 This is a circuit diagram of the multi-signal reset device in an embodiment of the present invention. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0022] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0023] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the invention is usually placed during use, they are only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0024] Furthermore, the use of terms such as "horizontal," "vertical," and "sag" does not imply that the component must be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0025] In the description of the embodiments of the present invention, "multiple" means at least two.

[0026] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0027] Example 1: This example provides a multi-signal reset device, including a main control chip, a capacitor C369 connected to the main control chip, multiple diodes and multiple resistors, and the cathodes of each diode respectively form the input terminals of the reset signal.

[0028] This solution utilizes a main control chip, multiple resistors, capacitor C369, and multiple diodes to form a low-cost solution that supports multiple reset signal inputs. It also supports a wide input reset signal level of 2.5V to 28V without any level conversion, making it suitable for various systems and highly compatible. Furthermore, the number of reset signal input channels can be increased by adding more diodes, making it flexible in application.

[0029] Example 2: This example provides a multi-signal reset device, including a main control chip, a capacitor C369 connected to the main control chip, multiple diodes and multiple resistors, and the cathodes of each diode respectively form the input terminals of the reset signal.

[0030] Optionally, the main control chip mentioned above is model SM706T.

[0031] Optionally, the diodes mentioned above are common anode diodes, and the number of common anode diodes is 2, including common anode diode V11 and common anode diode V12.

[0032] Optionally, the number of the above resistors is 3, including resistor R205, resistor R206 and resistor R207.

[0033] Optionally, the input terminals of the above reset signal include a first port, a second port, a third port, and a fourth port.

[0034] Among them, the first port, the second port, the third port and the fourth port mentioned above can be the button reset signal port, the main power failure reset signal port, the watchdog reset signal port and the board management chip reset signal port, respectively.

[0035] Specifically, the second port formed by the common anode diode V11 is connected to the PFO pin of the main control chip, and the third port formed by the common anode diode V12 is connected to the WDO pin of the main control chip; the anodes of both the common anode diode V11 and the common anode diode V12 are connected to the MR pin of the main control chip; as shown Figure 1 As shown, the two ends of capacitor C369 are connected to the VCC pin and GND pin of the main control chip, respectively; the two ends of resistor R205 are connected to the MR pin and VCC pin of the main control chip, respectively; one end of resistor R206 and one end of resistor R207 are both connected to the PFI pin of the main control chip; the other end of resistor R206 is connected to the 12V power supply terminal, and the other end of resistor R207 is grounded; the resistance values ​​of resistors R205, R206, and R207 are 4.7kΩ, 10kΩ, and 1.3kΩ, respectively; the capacitance value of resistor C369 is 0.1uF.

[0036] Specifically, a 4.7K resistor (R205) pulls up the first pin (MR) of the main control chip SM706T to 3.3V, ensuring a stable high level input at pin 1 during normal system operation. The common anodes of common anode diodes V11 and V12 are connected to pin 1 (MR) of the main control chip SM706T. Four reset input signals are connected to the two cathodes of common anode diodes V11 and V12. When the reset signal input is high, both common anode diodes V11 and V12 are in reverse cutoff state. Pin 1 (MR) of the SM706T chip remains at a stable high level. When any of the four reset input signals goes low, its corresponding common-anode diode will conduct unidirectionally, pulling pin 1 (MR) of the SM706T low. This will output a 100ms low-level reset signal from pin 7 (RESET) of the SM706T to stabilize and reset the microprocessor system. Meanwhile, the common-anode diodes corresponding to the other reset signals that do not go low remain in the off state. This ensures that the reset input signals are isolated from each other and do not interfere with each other.

[0037] Specifically, resistors R206 and R207 divide the main power supply of the board and connect it to pin 4 (PFI) of the main control chip SM706T to monitor the main power supply of the board. When the main power supply of the board drops to 10.8V, pin 5 (PFO) of the main control chip SM706T will output a power-down reset signal (PFO#). Of course, the power-down reset signal (PFO#) can also come from other circuits in the system.

[0038] Furthermore, the watchdog feed signal is connected to pin 6 (WDI) of the main control chip SM706T. When the system is in an abnormal state and the watchdog feed stops, pin 8 (WDO) of the main control chip SM706T will output the watchdog reset signal MAX706_WDO#. Of course, the watchdog reset signal MAX706_WDO# can also come from other circuits in the system.

[0039] Furthermore, the aforementioned capacitor C396 filters out interference signals introduced into the system through the 3.3V power supply, making the entire reset system more robust and stable.

[0040] Specifically, the multi-signal reset device provided in this embodiment can support a wide input reset signal level of 2.5V to 28V without any level conversion, making it suitable for various systems and highly compatible. It also supports four reset signal inputs, and the diode solution is inexpensive. Furthermore, the number of reset signal inputs can be increased by adding a common anode diode, making it flexible in application.

[0041] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A multi-signal reset device, characterized in that, It includes a main control chip, a capacitor C369 connected to the main control chip, multiple diodes and multiple resistors, and the cathodes of each diode form the input terminal of a reset signal.

2. The multi-signal reset device according to claim 1, characterized in that, The main control chip is model SM706T.

3. The multi-signal reset device according to claim 2, characterized in that, The diode is a common anode diode, and the number of common anode diodes is 2, including common anode diode V11 and common anode diode V12.

4. The multi-signal reset device according to claim 3, characterized in that, The number of resistors is 3, including resistor R205, resistor R206 and resistor R207.

5. A multi-signal reset device according to claim 4, characterized in that, The input terminals of the reset signal include a first port, a second port, a third port, and a fourth port.

6. A multi-signal reset device according to claim 5, characterized in that, The second port formed by the common anode diode V11 is connected to the PFO pin of the main control chip, and the third port formed by the common anode diode V12 is connected to the WDO pin of the main control chip; the anodes of both the common anode diode V11 and the common anode diode V12 are connected to the MR pin of the main control chip.

7. A multi-signal reset device according to claim 6, characterized in that, The two ends of the capacitor C369 are connected to the VCC pin and the GND pin of the main control chip, respectively.

8. A multi-signal reset device according to claim 7, characterized in that, The two ends of the resistor R205 are connected to the MR pin and VCC pin of the main control chip, respectively.

9. A multi-signal reset device according to claim 8, characterized in that, One end of resistor R206 and one end of resistor R207 are both connected to the PFI pin of the main control chip; the other end of resistor R206 is connected to the 12V power supply terminal, and the other end of resistor R207 is grounded.

10. A multi-signal reset device according to claim 9, characterized in that, The resistance values ​​of resistor R205, resistor R206, and resistor R207 are 4.7kΩ, 10kΩ, and 1.3kΩ, respectively; the capacitance value of capacitor C369 is 0.1uF.

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