藍(lán)牙5物聯(lián)網(wǎng)技術(shù)

　　最新版本的藍(lán)牙標(biāo)準(zhǔn)，藍(lán)牙5，設(shè)置提供了廣泛的增強(qiáng)功能，如更長(zhǎng)的范圍，更高的速度和擴(kuò)展支持無(wú)連接服務(wù)。這是一個(gè)重大的升級(jí)，今天的藍(lán)牙4.2技術(shù)，并將開(kāi)辟新的物聯(lián)網(wǎng)應(yīng)用程序的智能環(huán)境。

　　此舉允許企業(yè)和開(kāi)發(fā)者帶來(lái)一個(gè)可訪問(wèn)的，互操作的物聯(lián)網(wǎng)。新標(biāo)準(zhǔn)規(guī)定的模式與現(xiàn)有設(shè)備的四倍的范圍內(nèi)，通過(guò)降低數(shù)據(jù)速率為500 kbps和250 kbps的，以允許更多的傳感器被可靠地使用在家附近。這個(gè)范圍不僅允許更多的控制器和傳感器之間的距離，但也提供了一個(gè)更強(qiáng)大的終端設(shè)備的鏈接。它還允許兩倍的數(shù)據(jù)速率為2 Mbps的，以允許更高質(zhì)量的音頻流從監(jiān)視器或無(wú)線揚(yáng)聲器，以改善用戶(hù)體驗(yàn)。

　　Market research estimates that Bluetooth will be in more than one-third of all installed IoT devices by 2020， driven by the ubiquitous implementation in smartphones to act as controllers. However， the requirement for a Bluetooth 5 chip in a smartphone as the controller or for streaming to a wireless headset is very different from the requirements for the Internet of Things. These IoT applications also need more sophisticated power management to maximize the battery life of the system， so an optimized DC-DC converter is an increasingly common element of the SoC.

　　The designs now being delivered to chip designers accommodate the requirements of SoC devices for IoT. For example， the RivieraWaves Bluetooth IP platform consists of a hardware baseband controller， a digital modem， and a detailed software protocol stack. The stack encompasses the Link Layer up to the GAP/GATT plus a set of Services and Profiles. The Riviera technology has already been used for previous generations of Bluetooth 4.2 devices from NXP such as the MKW31Z256.