Radio frequency device and wireless sensor network system

Abstract

The invention discloses a radio frequency device and a wireless sensor network system adopting the radio frequency device. The radio frequency device integrates a radio frequency signal processor, an external crystal oscillator, an RTC (Real-Time Clock) circuit, a watchdog circuit and an external nonvolatile memory, which replaces an oscillator, a watchdog, a memory and other circuits inside a single-chip microcomputer chip of an original radio frequency signal processor, thereby taking advantages of each new component to integrally improve the accuracy of time synchronization of a wireless sensor network and reduce the system power consumption of the wireless sensor network.

Description

technical field [0001] The invention relates to the field of industrial monitoring, in particular to a radio frequency device for wireless network monitoring and a wireless sensor network system using the radio frequency device. Background technique [0002] Time synchronization is one of the important supporting technologies of wireless sensor networks. Sensor-based network applications such as system data collection, cooperative sleep, and time-division multiple access all require the clocks of each node in the sensor network to be synchronized. [0003] Most of the nodes in the wireless sensor network are unattended and only carry a small amount of limited energy. In order to prolong the service life of the wireless sensor network, the nodes in the wireless sensor network are in a dormant state most of the time. In order to be able to cooperate to complete work tasks, each node must cooperate to sleep, which requires each node to be able to accurately synchronize time. ...

AI Technical Summary

Problems solved by technology

The low-frequency RC oscillator is greatly affected by the change of ambient temperature, which will lead to poor synchronization accuracy of the low-frequency RC oscillator, and thus cannot realize tasks such as high-precision synchronous data acquisition and cooperative sleep of the wireless sensor network.

[0005] In addition, the delay period of the internal watchdog of the existing RF signal processor (the watchdog is a circuit that regularly checks the internal situation of the chip and sends a restart signal to the chip in case of an error) is relatively short, usually only a few milliseconds at the longest. , so the RF signal processor can only prevent the watchdog timer from overflowing by frequently waking up the watchdog

Frequent wake-ups increase the system power consumption of the entire wireless sensor network, thereby reducing the working time

[0006] Furthermore, the RF signal processor of the existing common RF module uses a non-volatile memory to store important system parameters, and its internal memory has no write protection measures, so there is a risk of system parameter loss

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