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ROHM旗下蓝碧石半导体开发出双模无线通信LSI“ML7404”

2017-8-23 12:10| 发布者: admin| 查看: 12205| 评论: 44

<概要>

全球知名半导体制造商ROHM集团旗下的蓝碧石半导体开发出无线通信LSI“ML7404”,该产品非常适用于作为IoT无线通信的新领域被寄予厚望的低功耗广域网络(LPWA:Low Power Wide Area)。

ML7404是业界首款支持LPWA双模的无线通信LSI。在使用无需授权的SubGHz频段的LPWA中,不仅支持在全球30多个国家和地区被广为采用、在日本国内也以首都圈为中心开始普及的“Sigfox”无线方式,同时还支持以“抗同一系统干扰波能力强”、“网络中可容纳更多终端”为特点的国际标准“IEEE802.15.4k注1”无线协议。业界首款支持双模通信,有望在适用范围广的LPWA网关等广泛用途/规格中大展身手。

本产品已于2017年7月开始销售样品,预计将于2017年12月量产销售。前期工序的生产基地为蓝碧石半导体宫城株式会社(日本宫城县),后期工序的生产基地为ROHM Integrated Systems (Thailand) Co., Ltd. (泰国)。

另外,为使LPWA无线设备开发更容易,并进一步为IoT社会作出贡献,搭载本产品的通信模块也即将由蓝碧石的合作公司发售。此外,本产品的IEEE802.15.4k用协议栈也将由堆栈供应商开源提供。

<背景>

近年来,作为IoT的无线通信,使用无需授权的SubGHz频段的LPWA备受关注。但是,通信方式因国家和地区的不同而多种多样,IoT网络的多样性使主流方式尚未确定。

蓝碧石半导体此前在业界率先推出SubGHz频段的特定小功率无线基站用的无线通信LSI,通过无线通信为全球实现智能化贡献了力量。而此次则面向建设早期的IoT网络、有效普及服务与应用,开发出支持多种方式的LPWA无线通信LSI。


<新产品特点>

1.作为LPWA无线通信方式,支持Sigfox和IEEE802.15.4k两种方式

ML7404是不仅支持在以欧洲为中心的地区颇具实际运营业绩、从2017年春天开始在日本首都圈部署的Sigfox,同时还支持国际标准IEEE802.15.4k的双模LPWA无线通信LSI。

(1)支持2017年春天开始投入运营的Sigfox

支持Sigfox。Sigfox是在以欧洲为首的全球30多个国家和地区颇具实际运营业绩的LPWA无线方式,在日本国内于2017年春天开始以首都圈作为起点部署运营。

(2)符合国际标准IEEE802.15.4k协议

支持IEEE规定的802.15.4k协议。该协议的特点是基于正交性扩频码的DSSS注2。与其他扩频无线通信方式相比,抗同一系统干扰波能力强,可在网络中容纳更多终端。在无需授权且通用的SubGHz频段,具有公认的高可靠性。

2.业界首家实现Sigfox使用的BPSK调制电路硬件化,有助于应用实现更低功耗

Sigfox使用以往的SubGHz无线中未采用的BPSK调制。以往支持Sigfox的无线通信LSI,不支持BPSK调制,因此需要通过微控制器的软件来创建BPSK的符号数据。而这种方法每次进行无线通信时,都必须驱动微控制器,使应用产生不必要的功耗。而ML7404不仅支持Sigfox,还将BPSK调制电路硬件化。

这样,微控制器在无线通信工作过程中无需再涉及无线通信的物理层,可使通信系统实现更低功耗。

3.开发支持体制完善

蓝碧石为客户提供完善的支持体制。评估套件中集成了示例程序(简易MAC)及各种测试场景。可提供模块型的参考设计信息。而且,用户登录蓝碧石半导体官网的支持网页,还可下载各种手册和工具等。

另外,搭载本产品的通信模块和IEEE802.15.4k用的低功耗协议栈即将由蓝碧石的合作公司发售。

【规格】

※参考値因通信条件和周围环境而异。

【销售计划】

-产品名称 :ML7404

-样品出售时间 :2017年7月起

-样品价格(参考):1000日元(不含税)

-量产销售计划 :2017年12月起

-量产销售规模 :月产10万个

-包装 :卷带(Tape&Reel)1000个

【应用领域】

需要燃气表/水表等智能仪表、传感器网络、建筑物健康监测、智能农业、防灾、其他的长距离无线通信的所有工业设备

【术语解说】

注1: IEEE802.15.4k

国际标准IEEE系列中的长距离无线标准。通过直接扩频方式提高接收灵敏度,以实现长距离通信。

IEEE802系列中,无线LAN、Bluetooth、ZigBee、Wi-SUN等物理层也已实现标准化。

注2: DSSS(Direct Sequence Spread Spectrum:直接序列扩频)

一种扩频方式。采集基带信号在频段扩展并发送。通信过程中的干扰波等噪声,通过接收时的解扩来扩展频率,因此具有优异的通信鲁棒性(Robustness)。


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