Control method for realizing ultra-low power consumption based on watchdog reset and heartbeat circuit

Abstract

The invention discloses a control method for realizing ultra-low power consumption based on watchdog reset and a heartbeat circuit. A system comprises a microprocessor U2, a battery, a microprocessorreset heartbeat circuit, a communication module U3, a communication module awakening circuit and a communication module reset circuit which are coupled together. The method comprises: using a TPL5010timer as a heartbeat circuit and a watchdog at the same time; selecting one minute as the heartbeat of the system; awakening the CPU once every minute; in other time, the CPU being in a dormant state;the sleep power consumption of the system being less than 0.4 uA; the current consumption of the TPL5010 timer being only 35nA. The timer can replace an integrated microcontroller timer to execute corresponding functions, so that the microcontroller is in a lower power consumption mode, and the reliability, the low power consumption and the long service life of the system are improved by combining the communication module awakening circuit, the communication module reset circuit and the battery voltage detection circuit. Tests prove that the battery can be used for 10 years without being replaced.

Description

technical field [0001] The invention belongs to the field of electronic technology, and in particular relates to a control method based on a watchdog reset and a heartbeat circuit to realize ultra-low power consumption. Background technique [0002] At present, in areas without mains power supply, sometimes it is necessary to arrange some special-purpose equipment, and solar energy cannot be used, but only battery power supply. These equipment need to replace the battery regularly. In order to reduce the frequency of battery replacement, it is necessary to design A circuit that can save electric energy, but there is no ideal control circuit at present. The fire alarm is used as an example to illustrate, but it is not limited to fire alarms. [0003] Fire alarm facilities are an important part of construction projects. At present, there are two types of wired alarm methods and independent alarm methods on the market; the traditional wired methods include alarms composed of wi...

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Problems solved by technology

[0002] At present, in areas without mains power supply, sometimes it is necessary to arrange some special-purpose equipment, and solar energy cannot be used, but only battery power supply. These equipment need to replace the battery regularly. In order to reduce the frequency of battery replacement, it is necessary to design A circuit that can save electric energy, but there is no ideal control circuit at present. The fire alarm is used as an example to describe it in detail, but it is not limited to fire alarms.

[0003] Fire alarm facilities are an important part of construction projects. At present, there are two types of wired alarm methods and independent alarm methods on the market; the traditional wired methods include alarms composed of wire-connected smoke detectors, temperature detectors, and smoke-temperature composite detectors. System, wired network alarm method is very difficult to popularize because of troublesome installation, large amount of engineering construction, high construction cost and maintenance cost, especially in the case of difficult wiring or damage to buildings.

The traditional independent alarm method is an alarm system composed of independent smoke, temperature, and smoke-temperature composite detectors. Except for factors such as high power consumption that requires external power supply, short transmission distance, limited communication resources, and high cost, it is silent. Optical linkage function, not to mention multiple sound and light linkage alarm functions, and no special control center. When working independently, the alarm sound cannot be heard even 200m-300m away from the door, which is not suitable for promotion in the whole field

[0004] At present, for the traditional alarm method, wireless alarms have also appeared. The power supply of wireless alarms on the market has two ways: mains power supply and battery. The alarm has a wide range of applications, but its control system design is unreasonable, resulting in relatively high power consumption of the alarm, the battery generally needs to be replaced in about 3 years, and the life is short

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