A multifunctional electromagnetic buzzer driving integrated circuit

Abstract

The utility model relates to a kind of multifunctional electromagnetic buzzer drive integrated circuit, including EN enable control circuit, DIN external signal control circuit, RC oscillation circuit, counting frequency division circuit, OUT output drive circuit, anti-peak absorption circuit.It can control high-precision RC oscillation circuit work by EN enable control circuit, after counting frequency division, drive circuit OUT exports fixed square wave signal, DIN can additional input signal, make output signal follow input signal;The anti-peak absorption circuit is connected with output drive circuit OUT.The utility model multifunctional electromagnetic buzzer drive integrated circuit is simple, in addition to itself can generate fixed drive signal, also can be controlled by single-chip microcontroller to enable EN enable port and DIN external signal input port, through software algorithm, can make buzzer produce continuous sound, various drop drop sound and various sound effect prompt sound, use more widely and intelligent.

Description

Technical Field

[0001] This utility model relates to the field of application-specific integrated circuit design, and specifically discloses a multifunctional electromagnetic buzzer driver integrated circuit. Background Technology

[0002] An electromagnetic buzzer is an electroacoustic device. Its internal electromagnetic coil is energized and de-energized at an audio frequency, causing the magnetic field to change periodically. This drives a metal diaphragm to vibrate, producing sound through cavity resonance. Resonance occurs when the audio frequency matches the buzzer's resonant frequency, resulting in the highest sound pressure level. Electromagnetic buzzers are small in size and have good sound quality, making them widely used in various instruments, office equipment, automotive electronics, small household appliances, smart homes, and the Internet of Things (IoT) for alerting and warning purposes.

[0003] With the rapid development of electronic technology, almost all kinds of electronic products have MCUs to implement various intelligent controls, and various sound effects and prompts have been developed through software algorithms to highlight the personalization of the products and meet the different needs of customers. Therefore, this paper proposes an electromagnetic buzzer that can generate various sound effects through a microcontroller. Utility Model Content

[0004] The purpose of this invention is to provide a multifunctional electromagnetic buzzer driver integrated circuit to solve the above problems. It adds a DIN external signal input port. In addition to retaining the EN enable port to make the electromagnetic buzzer produce continuous sound or modulate various beeping sounds, it can also be controlled by a microcontroller to generate various sound effects. The sound is input through the DIN external signal input port, and after current amplification at the OUT terminal, the electromagnetic buzzer sounds, thus meeting the various prompting sound requirements of electronic products.

[0005] The technical solution adopted by this utility model is as follows:

[0006] A multifunctional electromagnetic buzzer driver integrated circuit includes an EN enable control circuit, a DIN external signal input control circuit, an RC oscillation circuit, a counting and frequency division circuit, an output drive circuit, and an anti-peak absorption circuit.

[0007] The EN enable control circuit is connected to the RC oscillation circuit, the frequency division counting circuit, and the DIN external signal input control circuit.

[0008] The RC oscillation circuit, frequency divider counting circuit, and output drive circuit are connected in sequence;

[0009] The reverse peak absorption circuit is connected to the output drive port OUT of the output drive circuit.

[0010] Furthermore, the integrated circuit is externally provided with five ports, including an EN enable port led out from the EN enable control circuit, a DIN external signal input port led out from the DIN external signal input control circuit, a positive power supply port VDD connected to the RC oscillation circuit, the DIN external signal input control circuit and the anti-peak absorption circuit, a negative power supply port VSS connected to the output drive circuit, and an output drive port OUT connected to the output drive circuit.

[0011] Furthermore, when the EN enable port is connected to a high level or the positive power supply port VDD, the external input signal control circuit is shielded, the RC oscillation circuit operates, and through the counting and frequency division circuit and the drive circuit, the output drive port OUT outputs the set frequency.

[0012] Furthermore, when the EN enable port is connected to a low level, the DIN external signal input port is connected to a high level, the RC oscillator stops working, the output drive port OUT outputs a high level, and the entire circuit enters a low-power sleep state.

[0013] Furthermore, when the EN enable port is connected to a low level, the RC oscillator is shielded, the DIN external signal input port receives an audio signal, and the output drive port OUT synchronously outputs an audio square wave signal.

[0014] Furthermore, the RC oscillation circuit includes a resistor and capacitor network, and the RC oscillation frequency can be precisely adjusted by adjusting the network resistance and capacitance values.

[0015] Furthermore, the RC oscillation circuit is equipped with 7 metal fuses. Through precise calculation by an integrated circuit tester, the rated current is provided to blow several fuses to change the values ​​of the network resistance and capacitance, thereby achieving the required RC oscillation frequency.

[0016] Furthermore, the counting and frequency division circuit divides the set oscillation frequency multiple times through an RC oscillator to achieve an audio square wave signal that satisfies the requirements of driving the electromagnetic buzzer.

[0017] Furthermore, the positive terminal of the diode in the reverse peak absorption circuit is connected to the drain of the driving transistor in the driving circuit, and the negative terminal of the diode is connected to the positive power supply port VDD.

[0018] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0019] This utility model's multifunctional electromagnetic buzzer driver integrated circuit has a simple application circuit. It is directly connected to the enable EN and DIN external signal input ports via the microcontroller's I / O port. With the help of software algorithms, it can control the buzzer to sound or go into sleep mode. It can modulate various beeping sounds, various sound effects, and continuous sounds, fully meeting the needs of modern electronic products. Attached Figure Description

[0020] Figure 1 This is a functional block diagram of the integrated circuit of this utility model;

[0021] Figure 2 This is a schematic diagram of the integrated circuit package of this utility model;

[0022] Figure 3 This is a schematic diagram of the integrated circuit principle of this utility model;

[0023] Figure 4 This is a schematic diagram of the integrated circuit port of this utility model. Detailed Implementation

[0024] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0025] like Figure 1 As shown, a multifunctional electromagnetic buzzer driver integrated circuit includes an enable control circuit, an external signal input control circuit, an RC oscillation circuit, a counting and frequency division circuit, an output drive circuit, and an anti-peak absorption circuit.

[0026] The EN enable control circuit is connected to the RC oscillation circuit, the frequency division counting circuit, and the DIN external signal input control circuit.

[0027] The RC oscillation circuit, frequency divider counting circuit, and output drive circuit are connected in sequence;

[0028] The reverse peak absorption circuit is connected to the output drive port OUT of the output drive circuit.

[0029] This includes the EN enable port from the EN enable control circuit, the DIN external signal input port from the DIN external signal input control circuit, the positive power supply port VDD connecting the RC oscillation circuit, the DIN external signal input control circuit, and the anti-peak absorption circuit, the negative power supply port VSS connecting the output drive circuit, and the output drive port OUT connecting the output drive circuit.

[0030] When the EN enable port of the driver integrated circuit is connected to a high level or the positive power supply port VDD, the external input signal control circuit is shielded, the RC oscillation circuit works, and the set frequency is output through the counting and frequency division circuit and the driver circuit.

[0031] When the EN enable port of the driver integrated circuit is connected to a low level and the DIN external signal input port is connected to a high level, the RC oscillator stops working, the OUT output drive port outputs a high level, and the entire circuit enters a low-power sleep state with a static current of less than 1uA.

[0032] When the EN enable port is connected to a low level, the RC oscillator is shielded, the counting and frequency division circuit stops working, the DIN external signal input port can input various audio signals, and the output drive port OUT synchronously outputs the shaped audio square wave signal.

[0033] The aforementioned multifunctional electromagnetic buzzer driver integrated circuit has an internal RC oscillation circuit including a resistor and capacitor network, and seven external metal fuses. Using an integrated circuit tester, the rated current is supplied to several fuses to blow them through an algorithm, and the RC time constant of the resistor and capacitor network is precisely adjusted to ensure that the oscillation frequency of the high-precision RC oscillation circuit meets the requirements, ensuring that the design specification value of the buzzer drive frequency is ±1%.

[0034] The aforementioned counting and frequency division circuit divides the oscillation frequency of the RC oscillation circuit into multiple stages to generate an audio signal, which is then amplified by the output drive circuit, and the output drive current at the OUT terminal reaches 100mA.

[0035] The positive terminal of the diode in the reverse peak absorption circuit is connected to the drain of the drive transistor in the output drive circuit, and the negative terminal of the diode is connected to the positive power supply port VDD. This allows the reverse electromotive force generated by the electromagnetic buzzer coil when the drive transistor is turned off to be absorbed through the absorption circuit via the positive power supply port VDD.

[0036] Figure 2 The diagram shows two packaging forms and pin arrangement diagrams of the multifunctional electromagnetic buzzer driver integrated circuit of this utility model, where a is the first type of packaging and b is the second type of packaging.

[0037] Figure 3 The diagram shown is an electrical schematic of a typical application of the multifunctional electromagnetic buzzer driver integrated circuit of this utility model.

[0038] It also includes a filter capacitor C, which is connected to the positive power supply terminal VDD and serves as a power supply filter.

[0039] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A multifunctional electromagnetic buzzer driver integrated circuit, characterized in that: It includes an EN enable control circuit, a DIN external signal input control circuit, an RC oscillation circuit, a counting and frequency division circuit, an output drive circuit, and an anti-peak absorption circuit; The EN enable control circuit is connected to the RC oscillation circuit, the frequency division counting circuit, and the DIN external signal input control circuit. The RC oscillation circuit, frequency divider counting circuit, and output drive circuit are connected in sequence; The reverse peak absorption circuit is connected to the output drive port OUT of the output drive circuit.

2. The multifunctional electromagnetic buzzer driver integrated circuit according to claim 1, characterized in that: The integrated circuit has five external ports, including the EN enable port from the EN enable control circuit, the DIN external signal input port from the DIN external signal input control circuit, the positive power supply port VDD connecting the RC oscillation circuit, the DIN external signal input control circuit, and the anti-peak absorption circuit, the negative power supply port VSS connecting the output drive circuit, and the output drive port OUT connecting the output drive circuit.

3. The multifunctional electromagnetic buzzer driver integrated circuit according to claim 2, characterized in that: When the EN enable port of the EN enable control circuit is connected to a high level or the positive power supply port VDD, the output drive port OUT outputs the set square wave signal.

4. The multifunctional electromagnetic buzzer driver integrated circuit according to claim 2, characterized in that: The EN enable control circuit has its EN enable port connected to a low level. The external signal input DIN port is connected to an audio signal, which is shaped so that the output drive port OUT outputs an audio square wave signal that follows the input.

5. The multifunctional electromagnetic buzzer driver integrated circuit according to claim 2, characterized in that: When the EN enable port and the DIN external signal input port are both set to low level, the output drive port OUT outputs a high level, the RC oscillation circuit stops working, and the entire circuit enters a low-power sleep state.

6. The multifunctional electromagnetic buzzer driver integrated circuit according to claim 1, characterized in that: The RC oscillation circuit includes a resistor and capacitor network consisting of 7 metal fuses. By applying a rated current externally to selectively melt the 7 metal fuses, a high-precision and stable oscillation frequency is generated.

7. The multifunctional electromagnetic buzzer driver integrated circuit according to claim 1, characterized in that: The positive terminal of the diode in the reverse peak absorption circuit is connected to the drain of the driving transistor in the output driving circuit, and the negative terminal of the diode is connected to the positive power supply port VDD.

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