Que savez-vous de la classification des modules Bluetooth
Module Bluetooth, est une sorte de PCBA carte avec fonction Bluetooth intégrée, utilisé pour la communication sans fil à courte distance. Selon la fonction, il est divisé en module de données Bluetooth et module vocal Bluetooth. Le module Bluetooth fait référence à la fonction Bluetooth intégrée de la collection de circuits de base de la puce., utilisé pour la communication réseau sans fil, peut être grossièrement divisé en trois types: module de transmission de données, module audio Bluetooth, Module deux-en-un Bluetooth audio + données et ainsi de suite. Le module général a la propriété de produit semi-fini, qui est traité sur la base de la puce pour rendre l'application ultérieure plus simple.
Cet article est issu des différentes classifications des modules Bluetooth pour trier le type de module Bluetooth, Dans la mesure du possible du point de vue de la classification, comprendre que le module Bluetooth possède certaines caractéristiques et fonctions.
1.Classés par type de protocole
(1) Module Bluetooth classique
Module Bluetooth classique (BT) fait référence à la prise en charge du protocole Bluetooth 4.0 ou moins de modules peuvent être subdivisés en: module Bluetooth traditionnel et module Bluetooth haute vitesse.
Module Bluetooth traditionnel: le bluetooth est né au début, l'utilisation de la technologie du tarif de base BR, le débit de transmission théorique Bluetooth, ne peut atteindre que 721,2 Kbps, lancé dans 2004 pour prendre en charge le Bluetooth 2.0 module de protocole, le début de l'ère des smartphones, le nouveau taux d'amélioration Bluetooth EDR (Débit de données amélioré) technologie, en améliorant le multitâche et une variété de Bluetooth En améliorant le multitâche et la capacité de plusieurs appareils Bluetooth à fonctionner simultanément, il permet aux appareils Bluetooth de transmettre à des débits allant jusqu'à 3 Mbps, ce qui est trois fois le taux de transmission du Bluetooth 1.2 technologie. Par conséquent, en plus d'un streaming audio plus stable et d'une consommation d'énergie réduite, vous pouvez profiter pleinement de la bande passante pour connecter plusieurs appareils Bluetooth en même temps.
Module Bluetooth haut débit: Le module Bluetooth haut débit a été lancé en 2009, le représentant principal est de prendre en charge le Bluetooth 3.0 module de protocole, la nouvelle technologie High Speed, vous pouvez passer un appel Bluetooth 802.11 Le WiFi utilisé pour réaliser une transmission de données à haut débit, le taux de transmission allant jusqu'à 24 Mbps, est le module Bluetooth traditionnel de 8 fois.
Le module Bluetooth classique est généralement utilisé pour le streaming continu d'audio et le volume de données est une transmission relativement importante, comme la voix, musique, écouteurs sans fil, transfert de fichiers entre appareils, imprimantes, haut-parleurs sans fil et ainsi de suite.
(2) Module Bluetooth basse consommation
Module basse consommation (Bordel) désigne un module qui prend en charge le 2010 lancement du protocole Bluetooth 4.0 ou supérieur . La plus grande caractéristique est la réduction des coûts et de la consommation d'énergie . La technologie Bluetooth basse consommation utilise des intervalles de temps de connexion variables. L'intervalle peut être défini en fonction de l'application spécifique de quelques millisecondes à quelques secondes allant de la technologie BLE à l'aide d'une connexion très rapide, donc ça peut être dans le “non-connexion” État (économie d'énergie), lorsque la connexion entre les deux extrémités du lien n'est nécessaire que pour ouvrir le lien, puis fermez le lien dans les plus brefs délais. Ensuite, le lien est fermé dans les plus brefs délais.
Le Bluetooth basse consommation est utilisé en temps réel. Les exigences sont relativement élevées, mais faible vitesse, faible consommation d'énergie de la scène, comme la souris et le clavier, heart rate detectors and thermometers and other sensor devices, maison intelligente, smart wear such as the need for large amounts of data interaction in scenarios, is very suitable for Internet of Things applications.
Pour résumer, classic Bluetooth is not an outdated version of BLE. Classic Bluetooth and low-power Bluetooth coexist and are used in different applications, which completely depend on the different needs of each person.
2.Categorized by support for protocols
According to the number of Bluetooth protocol stack support can be divided into single-mode module and dual-mode module. The concept of single mode and dual mode is only available after the emergence of BLE Bluetooth. We should choose the required module according to cost, application and function.
(1) Single mode module
Single mode module is the module that supports a certain Bluetooth protocol, only the classic Bluetooth (BT) protocol or Bluetooth Low Power (Bordel) protocole.
(2) Dual mode module
Dual-mode modules are modules that support both the classic Bluetooth (BT) protocol and the low-power Bluetooth (Bordel) protocole, and can run two sets of protocol stacks. There are two types of dual-mode modules: Classic Bluetooth (data only)+ BLE and Classic Bluetooth (data+ audio)+ Bordel. Dual-mode modules have good flexibility and compatibility.
Bluetooth dual mode is undoubtedly the mainstream of the future. Classic Bluetooth power consumption, 4.0 after Bluetooth BLE, power consumption is small, but does not support the audio protocol and due to data transmission speed limitations, Bluetooth dual mode is a combination of the advantages and disadvantages of the two, can support both audio transmission, can also support data transmission, faible consommation d'énergie, and compatibility is the sum of the two.
3.Categorized by function
Standing in the Bluetooth module to transmit the size of of the functional point of view content, can be divided into the following categories.
(1) Data module
The general use of more data modules, c'est à dire. Bluetooth low power, also known as Bluetooth transmission module. Because the amount of data is not large, the transmission of proximity, operation and standby power consumption has strict requirements for the device is a good choice. Due to the advantages of power consumption, Bluetooth 4.0 module has now occupied most of the share of mobile data transmission, and the size and share is expected to continue to grow.
(2) Audio Module
The audio module requires a very large bit of streaming data, so it is more suitable for the classic Bluetooth module.
(3) Composite data and audio modules
It can transmit voice, audio and data at the same time. Under the trend of mobile Internet, data+ audio application, the dual mode module with data and audio composite is a good choice.2\According to the protocol support points
4. According to the chip design classification
This is differentiated according to the type of storage used by the Bluetooth chip in the module.
(1) ROM version
En général, the chip manufacturer’s ROM version of the chip, characterised by the chip manufacturer, will be the standard application PROFILES cured in the chip. Usually a fixed function, the user can not modify the program in the chip. Can be connected to an external EEPROM, storage space is small, can be used to store Bluetooth address, device name, PIN code , etc..
Use the ROM version of the chip to do less differentiation of the product, but the development is simple. For some conventional products, they do not need deep customization of the product. The choice of ROM version of the chip can be developed to speed up the development progress, speed up the time to market. Suitable for large-scale mass production, the price is very low, more commonly used for dongles, Bluetooth headset modules, cell phone modules, mouse and keyboard modules, etc., can modify the configuration parameters, but the basic function is fixed. Large-scale civilian products generally use the ROM version of the module, such as USB Bluetooth adapters on the market, because most of the protocol will run inside the PC. The chip processing power requirements are very low, so the chip manufacturer will launch very low-priced products.
(2) FLASH version
Chips are generally built-in FLASH, storage space is large. If you want to do some customer-defined products, such as the need to add some sensors, communication with external MCU, increase Bluetooth protocol or service, you need to use the FLASH version of the chip in the FLASH version of the existing project to add their own engineering code, develop their own firmware, to make a differentiated product. Relatively speaking , it is more flexible.
FLASH version of the chip price is high, but the user can be carried out according to their own application needs, due to the chip built-in FLASH storage, the performance of its performance, while built-in audio codec circuitry, suitable for a variety of voice gateway and other applications. Industrial Bluetooth applications should generally use the FLASH version of the chip produced by the module, course rapide, with high integration, haute fiabilité, high performance indicators and other characteristics.
(3) EXT version
EXT module chip without FLASH memory, the need to expand the memory device, the user can carry out application development, characterized by moderate prices, shortcomings are stability, power consumption and other performance differences, while most EXT chip does not have audio decoding circuits, such as the need to realizeio transmission needs to be connected to an external codec device.
5. Classification according to power
In terms of power, there is a difference between low-power Bluetooth and classic Bluetooth.
Low power Bluetooth has no power level, the transmission distance can be more than 100m, 5.0 protocol distance even up to 300m, the specific distance depends on the product design power. The modulation of Bluetooth Low Power technology is slightly different from traditional Bluetooth technology. This different modulation uses a 10mwdb wireless chipset (Low Power Bluetooth’s maximum power) to achieve a connection range of up to 300m, which means that the entire range of homes and buildings can be covered, achieving a more robust and reliable connection.
Classic Bluetooth has three levels of power, expressed in Class. According to the Bluetooth specification, Class is not used to specify distance, but to indicate transmit power. Bluetooth module transmit power parameters are determined, the actual transmit efficiency and RF circuit, antenna efficiency related to the Bluetooth module communication distance and transmit power, reception sensitivity and application environment is closely related to Bluetooth work in the 2.4G band, penetration capacity is poor, in the case of blocking, should be in the actual field to test the communication effect. The purpose of power control is to control the radiation within the limits without interfering with the normal operation of neighboring Bluetooth devices, using the link management protocol to realize the power control algorithm between master and slave devices.
(1) Classe 1
Classe 1 output power of 1mW (0dbm) to 100mW (20dbm), support for 100m transmission distance, in order to achieve the maximum range, power control is mandatory. Classe 1 is used in high-power, long-distance Bluetooth products, but because of the high cost and high power consumption, it is not suitable for cooperation with personal communication products (téléphones portables, Bluetooth headsets, Bluetooth Dongle, etc.), so it is mostly used in long-distance transmission.
En général, few people will use long-distance transmission, but if you want to transmit audio over a long distance, connect audio over a long distance, and more commonly in some large-scale venues, stages, and industrial scenarios, using a Bluetooth adapter that supports Class 1 is the best solution.
(2) Classe 2
Classe 2 output power of 0.25mW (-6dbm) to 2.5mW (4dbm), power control is optional, under normal circumstances 1mW (0dbm) supports 10m transmission distance, as long as the transmitter power can exceed 0dBm is part of the scope of Class 2, but if more than 4dBm, then it is Class 1.
Most of the common Bluetooth devices on the market today are power consumption Class 2, mostly used in cell phones, Bluetooth headsets, Bluetooth Dongle personal communication products, power consumption and smaller size, while easy to carry.
(3) Classe 3
Classe 3 output power ≤ 1mW (0dbm), support 1m transmission distance. With the lowest output power, Classe 3 devices are not common due to their very limited range of coverage.
6. Classification according to the support temperature
(1) Commercial grade
The temperature range is about 0℃~70℃. Generally used in ordinary consumer products, more common in life and lower prices are cheaper. Suitable for environmental conditions (comme la température, EMC and mechanical stress) at a mild to moderate level in consumer product applications. Such as a variety of consumer electronics, smart home appliances, appareils de divertissement, mobile computing, caméras, moniteurs, routers and test equipment.
(2) Industrial Grade
The temperature range is about -40°C to 85°C. Generally used in industrial environments, but also able to operate outdoors where the environment is not so good or where there is interference. Compared to commercial grade products, industrial grade products can withstand more extreme environments, and are suitable, expected, or required to be used in types or qualities for industrial use, such as transportation, factory automation, and high shock and vibration environments.
(3) Automotive grade
The temperature range is approximately -40℃ to 125℃. Generally used in automobiles or harsh environments, due to the high heat generated during the start-up process of automobiles, it will be a bit higher in terms of high temperature and more expensive than industrial grade, which may be subject to high levels of EMI, collision, shock and vibration, and extreme temperatures. This type of product is therefore designed for automotive, transportation and other mission-critical applications and meets industry-standard automotive specifications.
(4) Military Grade
The temperature range is approximately -55℃ to 150℃. Generally used in military equipment, so the requirements are also the most stringent, mainly used in missiles, aircraft, tanks, aircraft carriers and other military fields. Grade is the most advanced, haute précision, advanced technology and at the same time expensive, military grade is generally several years ahead of industrial grade time.
