POP sound preventing circuit on computer mainboard

Abstract

The utility model relates to a POP sound preventing circuit on a computer mainboard. The POP sound preventing circuit on the computer mainboard comprises an RS2 G07XC6 two-way buffer, a logic control chip and an audio chip, an audio chip reset signal is input into a first pin of the RS2G07XC6 two-way buffer, a second pin of the RS2G07XC6 two-way buffer is grounded, an audio chip mute control signal from the logic control chip is input into a third pin of the RS2G07XC6 two-way buffer, a fourth pin of the RS2G07XC6 two-way buffer is electrically connected with a MUTE pin of the audio chip, a fifth pin of the RS2G07XC6 two-way buffer is electrically connected with a direct-current power source on a mainboard, and a sixth pin of the RS2G07XC6 two-way buffer is electrically connected with the MUTE pin of the audio chip. According to the POP sound preventing circuit on the computer mainboard, the POP sound of the mainboard during S3, S4 or shutdown / restart can be reduced by optimizing the audio circuit.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic computers, in particular to a POP sound prevention circuit on a computer mainboard. Background Art

[0002] When running S3 or S4, or shutting down or restarting a desktop or laptop computer, a "peng" sound often appears at the headphone jack. This is generally referred to as a popping sound in hardware. Popping sound refers to the explosive sound produced by the speaker during various operations such as powering on and off. S3, S4, or shutting down or restarting a computer involves timing control of the audio chip. If this control is not properly adjusted, current will flow in the audio circuit, resulting in the popping sound.

[0003] According to conventional audio circuit configurations, when the MUTE signal on the audio chip's MUTE pin is pulled low, the audio chip is muted; only when the MUTE signal is pulled high can the audio chip produce sound. The root cause of the popping sound in a computer motherboard during S3 or S4 mode, or during shutdown / restart, is incorrect audio chip power-up timing. During power-up, the audio chip's MUTE pin is not pulled low, resulting in the popping sound. Furthermore, when the system loads the audio chip's driver, the audio chip may mistakenly emit a pulse after loading, which can also cause the popping sound. Summary of the Invention

[0004] Therefore, the purpose of the present invention is to provide a POP sound prevention circuit on a computer motherboard to solve the problem of POP sound occurring when the computer motherboard is in S3, S4 or shut down / restarted.

[0005] To achieve the above-mentioned objectives, the utility model provides a POP sound prevention circuit on a computer motherboard, comprising: an RS2G07XC6 dual-channel buffer, a logic control chip, and an audio chip; pin 1 of the RS2G07XC6 dual-channel buffer inputs an audio chip reset signal, pin 2 is grounded, pin 3 inputs an audio chip mute signal from the logic control chip, pin 4 is electrically connected to the MUTE pin of the audio chip, pin 5 is electrically connected to a DC power supply on the motherboard, and pin 6 is electrically connected to the MUTE pin of the audio chip.

[0006] The audio chip is SN6186, SN6140 or CX20632.

[0007] Wherein, the logic control chip is EC, CPLD or MCU.

[0008] Wherein, the EC is IT8528, IT8637 or IT5571.

[0009] Wherein, the CPLD is LCMXO3LF-2100C or XC2C128-7VQ100I.

[0010] Wherein, the MCU is STM32C011J4 or STM32C011F4.

[0011] Wherein, the DC power supply is a 1.8V DC power supply.

[0012] In summary, the POP sound prevention circuit on the computer motherboard of the present invention can reduce the POP sound of the motherboard when it is in S3, S4 or shut down / restart by optimizing the audio circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The following detailed description of the specific embodiments of the present invention in conjunction with the accompanying drawings will make the technical solutions and other beneficial effects of the present invention apparent.

[0014] Figure 1 This is a pin wiring diagram of the RS2G07XC6 dual buffer in a preferred embodiment of the POP sound prevention circuit on a computer motherboard of the present invention. DETAILED DESCRIPTION

[0015] The POP sound prevention circuit of the utility model has a simple structure and can be realized by optimizing the audio circuit on the existing computer mainboard without changing the timing control on the existing computer mainboard.

[0016] See also Figure 1 This is a pin wiring diagram of the RS2G07XC6 dual buffer in a preferred embodiment of the pop-up sound prevention circuit on a computer motherboard according to the present invention. The pop-up sound prevention circuit on a computer motherboard according to the present invention primarily includes: an RS2G07XC6 dual buffer, a logic control chip, and an audio chip. The logic control chip and audio chip can be configured according to commonly used audio circuits on computer motherboards. For example, the audio chip can be SN6186, SN6140, or CX20632; the logic control chip can be an EC, CPLD, or MCU; the EC can specifically be IT8528, IT8637, or IT5571; the CPLD can specifically be LCMXO3LF-2100C or XC2C128-7VQ100I; and the MCU can specifically be STM32C011J4 or STM32C011F4.

[0017] In this preferred embodiment, pin 1 of the RS2G07XC6 dual buffer inputs the audio chip reset signal HAD_RST#, pin 2 is grounded, pin 3 inputs the audio chip mute signal EC_MUTE# from the EC, and pin 4 is electrically connected to the MUTE pin of the audio chip. At this time, the signal actually loaded on the MUTE pin for controlling whether the audio chip is muted is the audio chip mute signal AUDIO_MUTE#. Pin 5 is electrically connected to the 1.8V DC power supply on the motherboard as the working power supply of the RS2G07XC6 dual buffer. Pin 6 is also electrically connected to the MUTE pin of the audio chip. Similarly, the signal actually loaded on the MUTE pin for controlling whether the audio chip is muted is the audio chip mute signal AUDIO_MUTE#.

[0018] In this preferred embodiment, pin 1 of the RS2G07XC6 dual buffer is also electrically connected to a 1.8V DC power supply on the motherboard via a 10 kilohm resistor R285, and pin 5 is also grounded via a 0.1 microfarad capacitor C317 to improve circuit stability.

[0019] Combine Figure 1 As shown in Table 1 below, the circuit of this utility model uses an RS2G07XC6 dual buffer to connect the audio chip reset signal HAD_RST# to the audio chip's MUTE pin. This way, until the audio chip is powered up (HAD_RST# remains low [0V] until power is on, and high [1.8V] after power is on), the RS2G07XC6 pulls the AUDIO_MUTE# signal low (as shown in the RS2G07XC6 function table), thus eliminating the popping sound during the power-up process.

[0020] The circuit uses an RS2G07XC6 dual buffer to connect the audio chip mute signal EC_MUTE# sent by the logic control chip (EC, CPLD, MCU, etc.) to the MUTE pin of the audio chip. Before the system completes the process of loading the audio chip driver, the EC_MUTE# signal will be pulled low. Then, through the circuit of the utility model, the audio chip mute signal AUDIO_MUTE# will be pulled low, thereby eliminating the pop sound during the process of loading the audio chip driver.

[0021] In addition, in the circuit of the present invention, the use of the RS2G07XC6 dual buffer can meet the requirement that when the system pulls down the audio chip mute signal EC_MUTE# during the process of loading the audio chip driver, the audio chip reset signal HAD_RST# is not affected (because both are connected to the AUDIO_MUTE# signal. If a diode or MOS is connected, the audio chip reset signal HAD_RST# will be accidentally pulled down, causing the audio chip to malfunction), without affecting the power-on timing of the chip.

[0022] Table 1. RS2G07XC6 Function Table

[0023] INPUT Output A Y L L H Z

[0024] H=High Voltage Level

[0025] L=Low Voltage Level

[0026] Z = High-impedance OFF-state

[0027] In summary, the POP sound prevention circuit on the computer motherboard of the present invention can reduce the POP sound of the motherboard when it is in S3, S4 or shut down / restart by optimizing the audio circuit.

[0028] As described above, for ordinary technicians in this field, various other corresponding changes and modifications can be made according to the technical solution and technical concept of the utility model, and all these changes and modifications should fall within the scope of protection of the claims attached to the utility model.

Claims

1. A POP sound prevention circuit on a computer motherboard, characterized in that: include: RS2G07XC6 dual-channel buffer, logic control chip, and audio chip; pin 1 of the RS2G07XC6 dual-channel buffer inputs the audio chip reset signal, pin 2 is grounded, pin 3 inputs the audio chip mute signal from the logic control chip, pin 4 is electrically connected to the MUTE pin of the audio chip, pin 5 is electrically connected to the DC power supply on the motherboard, and pin 6 is electrically connected to the MUTE pin of the audio chip.

2. The POP sound prevention circuit on a computer motherboard as claimed in claim 1, wherein: The audio chip is SN6186, SN6140 or CX20632.

3. The POP sound prevention circuit on a computer motherboard as claimed in claim 1, wherein: The logic control chip is EC, CPLD or MCU.

4. The POP sound prevention circuit on a computer motherboard as claimed in claim 3, wherein: The EC is IT8528, IT8637 or IT5571.

5. The POP sound prevention circuit on a computer mainboard as claimed in claim 3, wherein: The CPLD is LCMXO3LF-2100C or XC2C128-7VQ100I.

6. The POP sound prevention circuit on a computer mainboard as claimed in claim 3, wherein: The MCU is STM32C011J4 or STM32C011F4.

7. The POP sound prevention circuit on a computer mainboard as claimed in claim 1, wherein: The DC power supply is a 1.8V DC power supply.

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