CN114545819A - A detection circuit using AD port line as encoder - Google Patents

Abstract

The invention discloses a detection circuit using an AD port line as an encoder, including a volume encoder VOL1, which is characterized in that: the 1 pin of the volume encoder VOL1 is connected to a resistor R343, and the 3 pin of the volume encoder VOL1 is connected to a resistor R350 , resistor R343 and resistor R350 are connected to resistor R1 and connected to SYS3.3V interface, while resistor R343 and resistor R350 are connected to resistor R13 and connected to ECD-VOL interface. The AD port line is used as the detection circuit of the encoder to achieve the same function of multiple I/O ports. The circuit is simple and reliable, and the investment cost is low, which can effectively reduce the resource consumption of the single-chip microcomputer port.

Description

A detection circuit using AD port line as encoder

technical field

The invention relates to the technical field of encoders, in particular to a detection circuit using an AD port line as an encoder.

Background technique

In car multimedia products, there are many products that use volume encoders to adjust the volume. Traditional encoders often encounter insufficient I/O port resources in the circuit for volume adjustment, and choose to use more I/O port resources. A single-chip microcomputer is used to meet the circuit design requirements, which means that the design cost will increase.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a detection circuit using AD port line as an encoder, which realizes the same function of multiple I/O ports, and the circuit is simple and reliable, with low investment cost, which can effectively reduce the resource consumption of the single-chip microcomputer port, and can solve the problem of current There are technical problems.

In order to achieve the above object, the present invention provides the following technical scheme: a kind of detection circuit is made of encoder with AD port line, including volume encoder VOL1, it is characterized in that: 1 pin of described volume encoder VOL1 connects resistance R343, the volume encoding The 3-pin of the VOL1 is connected to the resistor R350, the resistor R343 and the resistor R350 are connected to the resistor R1 and connected to the SYS3.3V interface, and the resistor R343 and the resistor R350 are connected to the resistor R13 and connected to the ECD-VOL interface.

Preferably, the 1-pin circuit interface of the volume encoder VOL1 is connected to the capacitor C24 and grounded.

Preferably, the 3-pin circuit interface of the volume encoder VOL1 is connected to the capacitor C25 and grounded.

Compared with the prior art, the beneficial effects of the present invention are as follows:

The AD port line is used as the detection circuit of the encoder to achieve the same function of multiple I/O ports. The circuit is simple and reliable, and the investment cost is low, which can effectively reduce the resource consumption of the single-chip microcomputer port. Because the circuit is stable and reliable, it is very popular. sex.

Description of drawings

FIG. 1 is a circuit diagram of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Please refer to Figure 1, a detection circuit using AD port line as encoder, including volume encoder VOL1, volume encoder VOL1 pin 1 is connected to resistor R343, volume encoder VOL1 pin 3 is connected to resistor R350, resistor R343 and resistor R343 R350 is connected to the resistor R1 and connected to the SYS3.3V interface, while the resistor R343 and the resistor R350 are connected to the resistor R13 and connected to the ECD-VOL interface.

In the above, the 1-pin circuit interface of the volume encoder VOL1 is connected to the capacitor C24 and grounded, and the 3-pin circuit interface of the volume encoder VOL1 is connected to the capacitor C25 and grounded.

The AD port line is used as the detection circuit of the encoder. When the 3-pin and 2-pin of the volume encoder VOL1 are connected, the voltage on the ECD-VOL network is actually divided by the resistor R1 and the resistor R350, and the voltage value is: 3.3 X[82K/(47K+82K)]=2.1V.

When the 1 pin and 2 pin of the volume encoder VOL1 are connected, the voltage on the ECD-VOL network is actually divided by the resistor R1 and the resistor R343, and the voltage value is: 3.3X[47K/(47K+47K)]=1.65 V. The resistor R13 is the isolation resistor between the encoder and the single-chip microcomputer, and does not participate in the voltage divider. The capacitor C24 and the capacitor C25 are capacitors that filter out the instantaneous jitter of the interference voltage.

The AD port line is used as the detection circuit of the encoder. Turning clockwise is to turn on the 1st and 2nd pins of the volume encoder VOL1 first, then turn on the 3rd and 2nd pins. The AD pin of the single-chip microcomputer has a voltage of 1.65V first, which lags behind. 1/4 cycle and then 2.1V voltage.

Rotate counterclockwise to turn on the 3-pin and 2-pin of the volume encoder VOL1 first, then turn on the 1-pin and 2-pin. The AD pin of the single-chip microcomputer has a voltage of 2.1V first, and then a voltage of 1.65V after a 1/4 cycle.

Similarly, every time a grid is rotated to complete a pulse cycle, the AD port of the microcontroller can determine whether it is clockwise or counterclockwise through the sequence of the 1.65V and 2.1V pulse voltages.

To sum up, the AD port line is used as the detection circuit of the encoder to realize the same function of multiple I/O ports, and the circuit is simple and reliable, with low investment cost, which can effectively reduce the resource consumption of the single-chip microcomputer port. Because the circuit is stable and reliable Therefore, it is very popular and can effectively solve the existing technical problems.

It should be noted that, in this document, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any relationship between these entities or operations. any such actual relationship or sequence exists. Moreover, the terms "comprising", "comprising" or any other variation thereof are intended to encompass a non-exclusive inclusion such that a process, method, article or device comprising a list of elements includes not only those elements, but also includes not explicitly listed or other elements inherent to such a process, method, article or apparatus.

Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, and substitutions can be made in these embodiments without departing from the principle and spirit of the invention and modifications, the scope of the invention is defined by the appended claims and their equivalents.

Claims (3)

1. The utility model provides a detection circuitry who uses AD oral siphon to do encoder, includes volume encoder VOL1, its characterized in that: a pin 1 of the volume encoder VOL1 is connected with a resistor R343, a pin 3 of the volume encoder VOL1 is connected with a resistor R350, the resistor R343 and the resistor R350 are connected with a resistor R1 and are connected with an interface SYS3.3V, and meanwhile, the resistor R343 and the resistor R350 are connected with a resistor R13 and are connected with an ECD-VOL interface.

2. The detecting circuit of claim 1, wherein the detecting circuit comprises: the 1-pin circuit interface of the volume encoder VOL1 is connected to the capacitor C24 and to ground.

3. The detecting circuit of claim 1, wherein the detecting circuit comprises: the 3-pin circuit interface of the volume encoder VOL1 is connected to the capacitor C25 and to ground.

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