CN220234648U

CN220234648U - Built-in schmidt level flip IC chip

Info

Publication number: CN220234648U
Application number: CN202321673910.7U
Authority: CN
Inventors: 丁兆怡; 张凌军
Original assignee: Hefei Panxin Electronic Co ltd
Current assignee: Hefei Panxin Electronic Co ltd
Priority date: 2023-06-29
Filing date: 2023-06-29
Publication date: 2023-12-22
Anticipated expiration: 2033-06-29

Abstract

The utility model discloses an Integrated Circuit (IC) chip with a built-in Schmidt level flip, which comprises a microprocessor, wherein the microprocessor is connected with a Schmidt trigger module, and outputs a control signal to the Schmidt trigger module to control the switch of the Schmidt trigger module; the Schmidt trigger module is electrically connected with the I/O port; the Schmidt trigger module judges and processes the voltage signal transmitted by the I/O port, and inputs/outputs the processed signal through the I/O port. The utility model constructs the general Schmitt level-turning IC chip through the cooperation of the microprocessor, the Schmitt trigger, the normal phase threshold and the reverse phase threshold, has simple and convenient setting of the trigger upper and lower limit threshold, does not need an external Schmitt trigger, is not easy to be interfered by external connection, and greatly reduces the hardware cost.

Description

Built-in schmidt level flip IC chip

Technical Field

The utility model belongs to the technical field of integrated chips, and particularly relates to an Integrated Circuit (IC) chip with built-in Schmidt level overturning.

Background

The schmitt trigger has two stable states, but unlike a general trigger, the schmitt trigger adopts a potential triggering mode, and the state of the schmitt trigger is maintained by the potential of an input signal; the schmitt trigger has different threshold voltages for input signals in two different changing directions, namely negative decreasing and positive increasing. For a standard schmitt trigger, when the input voltage is higher than the forward threshold voltage, the output is high; when the input voltage is lower than the negative threshold voltage, the output is low; when the input is between the positive and negative threshold voltages, the output is unchanged, that is, the output is turned from the high level to the low level, or the threshold voltages corresponding to the turning from the low level to the high level are different. The output will only change when there is a sufficient change in the input voltage and, because of the hysteretic nature of the schmitt trigger, it is useful for anti-tamper, applications including anti-tamper in an open loop configuration and for implementing multivibrators in a closed loop positive feedback/negative feedback configuration. Such circuits are designed to prevent changes in the output voltage caused by small changes in the input voltage (below a certain threshold). The traditional schmitt trigger circuit often needs an external circuit, and huge cost is brought when the product is produced in a large quantity.

Disclosure of Invention

The utility model aims to provide an IC chip with a built-in Schmidt level flip, which is constructed by matching a microprocessor, a Schmidt trigger, a normal phase threshold value and an inverse phase threshold value.

In order to solve the technical problems, the utility model is realized by the following technical scheme:

the utility model relates to an Integrated Circuit (IC) chip with a built-in Schmidt level flip, which comprises a microprocessor, wherein the microprocessor is connected with a Schmidt trigger module, and the microprocessor outputs a control signal to the Schmidt trigger module to control the switch of the Schmidt trigger module; the Schmidt trigger module is electrically connected with the I/O port; the Schmitt trigger module judges and processes the voltage signals transmitted by the I/O port, and inputs/outputs the processed signals through the I/O port.

Further, the schmitt trigger module compares the received voltage signal with a preset voltage threshold through a comparator.

Further, the voltage threshold set by the schmitt trigger module comprises a positive voltage threshold and a negative voltage threshold.

Further, the normal phase voltage threshold is an input voltage that changes a state of the port in a process of increasing the input signal from a low level to a high level.

Further, the inverted voltage threshold is an input voltage that changes a state of the port in a process of the input signal falling from a high level to a low level.

The utility model has the following beneficial effects:

the utility model constructs the general Schmitt level-turning IC chip through the cooperation of the microprocessor, the Schmitt trigger, the normal phase threshold and the reverse phase threshold, has simple and convenient setting of the trigger upper and lower limit threshold, does not need an external Schmitt trigger, is not easy to be interfered by external connection, and greatly reduces the hardware cost.

Of course, it is not necessary for any one product to practice the utility model to achieve all of the advantages set forth above at the same time.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a system block diagram of an IC chip with built-in Schmidt level flipping;

fig. 2 is a pin diagram of an IC chip with built-in schmitt level flip.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 1, the utility model is an IC chip with built-in schmitt level flip, the type of the IC chip is M9F680, and the IC chip comprises a microprocessor MCU, wherein the microprocessor MCU is connected with a schmitt trigger module SMT, and outputs a control signal to the schmitt trigger module to control the switch of the schmitt trigger module SMT; the Schmidt trigger module SMT is electrically connected with the I/O port, and judges and processes the voltage signal transmitted by the I/O port;

the Schmitt trigger module compares the received voltage signal with a preset voltage threshold value through a comparator; the voltage threshold set by the schmitt trigger module comprises a positive-phase voltage threshold and an inverse-phase voltage threshold. The normal phase voltage threshold is an input voltage that changes the state of the port in the process of the input signal rising from a low level to a high level; the inverted voltage threshold is an input voltage that changes the state of the port during the fall of the input signal from a high level to a low level;

if the input voltage of the I/O port is larger or smaller than the internal voltage threshold of the Schmidt trigger module SMT, the port register is turned over, and the Schmidt trigger module SMT inputs/outputs the processed signals through the I/O port.

As shown in fig. 2, which is an M9F680 pin diagram, M9F680 has at most 30 bidirectional IO ports, all ports can be set up to be pulled down, any port can be configured with schmitt flip, when any port input voltage rises from low level to positive threshold voltage, the state of the input port is high level, and when any port input voltage falls from high level to negative threshold voltage, the state of the input port is low level. The forward threshold is: the input voltage that changes the state of the port in the process of the input signal rising from the low level to the high level is referred to as a positive threshold voltage, and the negative threshold is: the input voltage that changes the state of the port during the fall of the input signal from high to low is referred to as a negative-going threshold voltage.

In the description of the present specification, the descriptions of the terms "one embodiment," "example," "specific example," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The preferred embodiments of the utility model disclosed above are intended only to assist in the explanation of the utility model. The preferred embodiments are not exhaustive or to limit the utility model to the precise form disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the utility model and the practical application, to thereby enable others skilled in the art to best understand and utilize the utility model. The utility model is limited only by the claims and the full scope and equivalents thereof.

Claims

1. The IC chip with the built-in Schmidt level overturning function is characterized by comprising a microprocessor, wherein the microprocessor is connected with a Schmidt trigger module, and the microprocessor outputs a control signal to the Schmidt trigger module to control the switch of the Schmidt trigger module;

the Schmidt trigger module is electrically connected with the I/O port;

the Schmitt trigger module judges and processes the voltage signals transmitted by the I/O port;

the Schmitt trigger module inputs/outputs the processed signals through an I/O port.

2. The IC chip of claim 1, wherein the schmitt trigger module compares the received voltage signal to a predetermined voltage threshold via a comparator.

3. The IC chip of claim 2, wherein the voltage thresholds set by the schmitt trigger module include a positive voltage threshold and a negative voltage threshold.

4. The IC chip of claim 3, wherein the normal phase voltage threshold is an input voltage that changes a state of the port during a rise of the input signal from a low level to a high level.

5. The IC chip of claim 3, wherein the inverted voltage threshold is an input voltage that changes a state of the port during a decrease of the input signal from a high level to a low level.