![]() ![]() Consumer devices with Bluetooth LE were often labeled as being Bluetooth Smart, while Bluetooth BR/EDR are labeled as Bluetooth Classic however, these terms are no longer used. Bluetooth 4.0 did not completely obsolete Bluetooth BR/EDR, but instead offered Bluetooth LE in addition to Bluetooth BR/EDR. Given these similarities, the Bluetooth SIG eventually adopted Wibree into its specification, releasing it as a new low-energy extension called Bluetooth Low Energy (Bluetooth LE).īluetooth LE first appeared in the Bluetooth 4.0 specification. Wibree included many techniques similar to Bluetooth BR/EDR, including operation in the 2.4GHz ISM band, GFSK modulation, a channel scheme, and frequency hopping. It was also developed to be very low cost and easy to configure. It was designed to consume very little power, making it ideal for devices that run on small batteries. Bluetooth LEīluetooth LE was first developed by Nokia as a wireless technology called Wibree. GFSK transmits 1 bit per symbol, while QDPSK transmits 2 bits per symbol and 8DPSK transmits 3 bits per symbol. It uses differential quadrature phase-shift keying (QDPSK) and differential 8-level phase-shift keying (8DPSK) alongside GFSK. With Bluetooth EDR, data can be transferred 2x to 3x faster than Bluetooth BR. Bluetooth BR quickly become popular because it provided a low-cost, low-power way to send and receive data wirelessly across short ranges at data rates up to 0.7Mbps.īluetooth 2.0 emerged a few years later and included the option for Bluetooth EDR. Unlike most frequency bands, a license is not required to operate within this band. The 2.4GHz ISM band was chosen because communication is free. Bluetooth BR/EDRīluetooth BR, the first Bluetooth protocol developed, implements a unique method that uses Gaussian frequency shift keying (GFSK) to exchange data within the 2.4GHz ISM band. Timeline of each Bluetooth specification release. The timeline in Figure 2 shows the Bluetooth specifications that have been released and where Bluetooth BR, Bluetooth EDR, Bluetooth LE, and Bluetooth 5 fall within those specifications.įigure 2. When new developments are made, the Bluetooth SIG releases a new specification to introduce improvements. Bluetooth HistoryĮach of the Bluetooth versions was developed by the Bluetooth Special Interest Group (Bluetooth SIG), which manages all Bluetooth protocols. This application note explains the differences between Bluetooth LE and Bluetooth BR/EDR, how Bluetooth 5 promises to enhance both protocols, and ways to choose the version that is optimal for your design. Newer applications even have the potential to use Bluetooth 5. Some applications use Bluetooth Low Energy (Bluetooth LE, casually called BLE), while others utilize Bluetooth Basic Rate/Enhanced Data Rate (Bluetooth BR/EDR). ![]() There are a few different flavors of Bluetooth wireless technology. Bluetooth wireless technology lets us send and receive data without the tangle of cords and wires. Figure 1 depicts two common Bluetooth technology-enabled devices: a smartphone and a laptop.įigure 1. We are also tapping into the protocol to send files between a tablet and a computer, send updates from a fitness tracker to a smartphone, and much more. Inside homes, Bluetooth wireless technology in smart home security systems lets us lock and unlock doors with our phones. ![]() For example, Bluetooth wireless technology inside vehicles lets us play favorite tunes on our smartphones from the car stereo. Bluetooth ® wireless technology is one of the most popular protocols that enables us to send and receive data wirelessly, as its versatility allows it to be used in many applications. IntroductionĮlectronic devices equipped with wireless communication free us from the tangle of plugs and cables. A similar version of this application note originally appeared on July 18, 2019, in Electronic Design and in Microwaves & RF. This application note explains the differences and suggests ways to determine the best version for your design. The emergence of Bluetooth 5 has further confused the landscape. Most people do not understand the difference between Bluetooth Low Energy and Bluetooth Basic Rate/Enhanced Data Rate. ![]()
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