Alarm sound chip, internal circuit and application circuit thereof

Abstract

The invention discloses an alarm sound chip, an internal circuit and an application circuit thereof. The chip comprises: a matrix, a mode input pin, a grounding pin and an output pin. The mode input pin, the grounding pin and the output pin are respectively arranged on the matrix and are electrically connected with a corresponding circuit in the matrix. A built-in reset unit, a voltage stabilization unit, a clock unit, an input mode selection unit, a tone control unit, a rhythm control unit, a state control unit, a memory cell, an output logic unit and the like are integrated in the chip. The application circuit comprises: the alarm sound chip, a loudspeaker and an electronic control switch. An alarm trigger signal is input into the mode input pin of the alarm sound chip. The grounding pin of the alarm sound chip is grounding. The output pin of the alarm sound chip makes the loudspeaker sound through the electronic control switch. By using the alarm sound chip, the internal circuit and the application circuit, pin quantities and packaging costs can be substantially reduced. Few periphery components are needed so as to realize alarm. The application circuit is simple and is easy to be realized.

Description

technical field [0001] The invention discloses an alarm sound chip, an internal circuit and its application circuit, in particular an alarm sound chip, an internal circuit and its application circuit with few interface pins and simple and convenient use. Background technique [0002] Along with the development of science, alarm sound circuit is more and more widely used in people's daily life, too numerous to enumerate, and the form of existing alarm sound circuit is also various, and application field is very extensive. Among them, the relatively large use, which is also a common use of people, is applied to anti-theft of automobiles and motorcycles. At present, there are two main types of alarm tone circuits, one is implemented by MCU, which has flexible functions and good reliability, but the cost is high; the other is implemented by a dedicated integrated circuit, which has complete functions and good reliability, but its disadvantages That is, there are many pe...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the above-mentioned shortcomings in the prior art, such as many peripheral components, many pins, and high packaging cost, the present invention provides a new alarm sound and its internal circuit and application circuit. The alarm sound chip of the present invention integrates a stable Voltage circuit, oscillator, reset circuit, main clock circuit, tone control circuit and output logic circuit, etc., so that the present invention only needs three pins, adopts TO-92 package form, and cooperates with very few peripheral circuits to realize the alarm Function

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