Integrated circuits and systems for smoke alarms

Abstract

The present invention relates to an integrated circuit for smoke alarm. The integrated circuit includes three detection function pins, two power supply pins, an alarm pin, and two pins for implementing calibration, keys and instruction. The invention also comprises a smoke alarm system. The system includes the above integrated circuit and peripheral circuits. The peripheral circuits include a power supply module, a smoke sensor module, an alarm module and a key and indication module. The integrated circuit for smoke alarm and the system with the above structure have fewer pins and simple peripheral devices, the smoke alarm sensitivity and consistency are better according to a digital calibration method, a single-pin driving alarm function is achieved by a special buzzer driving mode, the calibration mode is simpler and is easier to implement, the overall cost is reduced, and the integrated circuit and the system have a wide range of applications.

Description

technical field [0001] The invention relates to the technical field of sensor detection, in particular to the technical field of smoke alarms, in particular to an integrated circuit and system for smoke alarms. Background technique [0002] With the improvement of the safety awareness of the whole society, fire detection and prevention have become an important part of security measures, and the most important safety detection unit is the smoke alarm. [0003] The existing design scheme of smoke alarm is as follows: figure 1 As shown, it can be basically divided into four parts: smoke sensor module, main control unit, alarm and alarm indicator / key detection. Among them, the main control unit mostly adopts a single customized chip, that is, a dedicated chip (ASIC), and realizes the final smoke detection and alarm function by combining with peripheral discrete devices; Functional components such as sensors and alarms realize the ultimate smoke detection and alarm functions. ...

AI Technical Summary

Problems solved by technology

Therefore, the single-chip microcomputer of this scheme also needs a lot of pins, and needs more peripheral devices to cooperate, and the internal structure of the single-chip microcomputer circuit is often complex, integrating many redundant functional modules, such as LCD Driver, etc., which increases unnecessary costs

At the same time, due to the influence of the consistency of peripheral devices, it is difficult to control the sensitivity of smoke alarms

[0010] To sum up, both the application-specific chip solution and the single-chip microcomputer solution need to configure many pins or interfaces to match the corresponding functional modules, and cooperate with complex peripheral circuits to meet the final requirements. Therefore, the above two solutions have relatively high customization costs. high defect

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