2020-11-27 10:13:31

ezcui: 蓝牙传输距离的难点主要有哪些？？

答：首先是芯片或者模块的发射功率和灵敏度要好，Silicon Labs支持最高20dbm发射功率，灵敏度最低－106.7dbm. 另外天线设计也非常关键。

2020-11-27 10:14:09

topwon: 蓝牙mesh与zigbee的竞争优缺点是怎样的？

答：蓝牙Mesh优势：

2020-11-27 10:07:43

crystall2k: 支持一对多，多对一吗？

答：Yes for both. Simultaneous connections Up to 8 (BG22 and BG1) and up to 32 (BG21 and G12). Bluetooth SDK 3.0 supports 32 simultaneous connections but depending on chips. The stack (Bluetooth SDK v3.0) supports up to 32 simultaneous connections on EFR32[B|M]G12 and EFR32[B|M]G21. On other parts, the actual maximum number of connections is restricted by available RAM space. For the stack to successfully maintain more than 8 simultaneous connections and to maximize data throughput

2020-11-27 10:08:24

意泊之: 蓝牙传输无障碍通信距离大概是多少？隔墙大概是多远？

答：The BG22 goes up to around +6dBm TX power and has -99dBm sensitivity, giving you around 105dB link budget. Line-of-sight range could be 200 meters or more. Indoors will be less. But of course range always depends on a lot of other factors unique to the location. Bluetooth SIG provides an on-line tool which can help to estimate the range in different places, like outdoor, factory, office, and home. https://www.bluetooth.com/learn-about-bluetooth/bluetooth-technology/range/

2020-11-27 09:47:53

humanhe: 可否独享链接？即只有合法的APP才能链接该蓝牙，其它不能链接？

答：可以支持Privacy mode，详见软件reference manual

2020-11-27 09:56:09

wgzgege: 低功耗蓝牙产品目前主要应用在哪些市场？

答：低功耗应用非常广泛，在智能家居，个人消费产品，医疗，工业等领域都可以应用

2020-11-27 10:07:42

FSILK_Tech: EFR32BG22 实现室内定位能达到多少精度？SDK中是否有定位相关应用案例？

答：It could be down to sub-meter. Silicon Labs’ Bluetooth Direction Finding (AoA/D) solution is still under development. I am afraid I can’t provide too much information in this public forum. If you would like further info, it is encouraged for me to contact our one of our distributors in your country for further discussion : https://www.silabs.com/about-us/contact-sales?view=map

2020-11-27 09:57:43

otsuka: BGM220现在应用最多的是？

答：应用非常广泛，具体比较数据，请透过代理商咨询原厂销售和市场

2020-11-27 10:10:01

ezcui: 蓝牙是否有望大幅拓展传输距离？该用哪些有效措施？

答：Yes. You can make use of Bluetooth 5 – LE Coded PHY or LE Long Range PHY.

2020-11-27 10:00:01

1857: BLE和传统蓝牙有什么区别，各有什么优缺点

答：传统蓝牙偏向音频等大吞吐量的应用，功耗高，BLE偏向低功耗应用，目前最新的５.２标准也开始支持音频应用。

2020-11-27 10:10:10

jf_65547654: BT Scan/data transfer是否能共存使用？

答：Yes. It is possible. The two tasks can take turn to run.

2020-11-27 10:08:02

旭日东升_e92: 封装形式好多？

答：QFN32，TQFN32，QFN40

2020-11-27 10:08:02

biaopinhao: 3.6mA Radio TX 2.6mA Radio RX这数据是什么功率下的？

答：0dbm

2020-11-27 10:09:58

weijinke: 是否有开发板和对应的DEMO程序提供？在哪儿获取？

答：请安装Simplicity Studio开发工具

2020-11-27 10:09:57

hhshaha: 怎么理解低功耗蓝牙服务，特性，属性，和uuid

答：For the details, you can refer to https://docs.silabs.com/bluetooth/latest/general/gatt-protocol/using-characteristics-value-types#introduction and https://docs.silabs.com/bluetooth/latest/general/gatt-protocol/gatt-server-and-client-roles

2020-11-27 10:15:22

chuan_2020: BG22是包含一个Cortex-M33 core吗

答：除了这个核心，还有一个MO内核负责Radio收发

2020-11-27 10:15:51

jf_69790107: BG22高主频是否意味着功耗越高？

答：高主频意味着在EM0和EM1模式下更高的功耗

2020-11-27 10:12:11

旭日东升_e92: PA modes 是什么？

答：PA = Power Amplifier for RF front end. There are two PA modes: low and high PA modes

2020-11-27 10:16:07

topwon: 蓝牙AOA测角定位的精度目前到怎样的级别？需要自己再开发和优化算法吗？

答：算法由Silicon Labs提供，不需要客户优化。免费天线的精度是5度，收费天线可以达到1度

2020-11-27 10:07:25

意泊之: 这些开发工具是免费提供的？可以直接网站上下载吗？

答：Yes. It is free of charge. Please refer to https://www.silabs.com/wireless/bluetooth#software (select "Software and Tools" on that webpage.