There are many brands and types of wirelesschips currently on the market. Related manufacturers have done a lot of module sbased on these wireless chips. Developers unfamiliar with the field of wireless transmission may encounter some difficulties when choosing the right wireless module for the project. This article responds to the difficulties thatdevelopers may encounter.
First of all, it must be clear that allwireless chips are used to transmit data. Although the transmission methods aredifferent due to the difference in chips, in general, the tasks completed bythese modules or chips are the same, that is, transmitting data.
At present, there are two major types ofwireless transmission modules on the market: front-end and digital transmissionmodules. Take the wireless RF4438 front-end module as an example. This moduleis based on the SI4438 ASK chip developed by Silicon Labs. It has no MCU insideand has extremely low receiving sensitivity (-124 dBm), plus theindustry-leading output power of +20 dBm. Which ensures extended range andimproved link performance. At the same time, the built-in antenna diversity andfrequency hopping support can be used to further expand the range and improveperformance.
Taking the wireless SV610 wireless datatransmission module as an example, it also integrates the high-performance RFchip of Silicon Labs in the United States, and an MCU for controllingcommunication. The sensitivity of this digital transmission module is thesensitivity of the integrated wireless chip.
After briefly introducing the wirelessfront end and wireless data transmission, some readers may still not be able totell the difference between the two.
In fact, it can be distinguished accordingto the difference between the kind of modules. The front-end module is composedof a wireless chip plus corresponding peripheral matching circuits. Developersneed to write the corresponding driver according to the chip's referencemanual, and then write the corresponding control logic according to the needsof the business. Considering the timing of the project, developers can try thismethod when the project has more time. At this time, the developer shouldcarefully read the reference manual of the chip, and then refer to some demoprograms to quickly complete the development of wireless functions. However, itis not recommended to use the front-end module when the project time is urgent.Due to the characteristics of the front-end module, its price is slightly lowerthan the digital transmission module.
As for the data transmission module,because it has integrated MCU internally, it can receive external data, anddevelopers do not need to care about how to write a driver, and can be easilyintegrated into their own projects. Through the external interface of theoutput module (such as TTL interface, RS232 interface \ RS485 interface), youcan directly input the corresponding data to the digital transmission module.This can save a lot of development time because developers do not need to writedrivers themselves, and avoid many potential errors caused by unfamiliaritywith wireless chips, which simplifies the development process. Because the MCUand the corresponding control program are integrated inside the datatransmission module, its price is slightly higher than the front-end module.
Compare the difference between the two with atable:
Digital transmission module
Whether need a driver
Depended an the integrated chip
Depended en the use method
wireless RF4438 front-end module SV610 wireless datatransmission module
I believe that after reading the introduction above,developers will have a clear understanding of the data transmission module ofthe front-end module, and will know what kind of module they should choose inthe project.