~ Support Sigfox and IEEE802.15.4k two ways, IoT device communication distance is 10 times larger than SubGHz wireless ~
<summary>Lanshiishi Semiconductor, a globally renowned semiconductor manufacturer under the ROHM Group, has developed the wireless communication LSI "ML7404", which is ideal for low-power wide-area networks (LPWA: Low Power Wide Area) that are expected to be a new area of ​​IoT wireless communication. ).
The ML7404 is the industry's first wireless communication LSI to support LPWA dual mode. In the LPWA that uses the unlicensed SubGHz band, it supports not only the "Sigfox" wireless method that has been widely adopted in more than 30 countries and regions in the world, but also the popularization of the "Sigfox" wireless system in Japan. The international standard "IEEE802.15.4k Note 1" wireless protocol characterized by strong interference wave capability of the same system and "more terminals in the network". The industry's first dual-mode communication support is expected to be used in a wide range of applications/specifications such as the wide range of LPWA gateways.
This product has been sold in July 2017 and is expected to be in volume production in December 2017. The production base of the pre-process is Lashibi Semiconductor Miyagi Co., Ltd. (Miyagi Prefecture, Japan), and the production base for the later process is ROHM Integrated Systems (Thailand) Co., Ltd. (Thailand).
In addition, in order to make the development of LPWA wireless devices easier and further contribute to the IoT society, the communication module equipped with this product will soon be released by the cooperation company of Lanshishi. In addition, the IEEE802.15.4k protocol stack for this product will also be provided by the stack vendor open source.
<background>In recent years, as a wireless communication of IoT, LPWA using a sub-band that does not require authorization has been attracting attention. However, the way of communication varies from country to country, and the diversity of IoT networks has made the mainstream approach undetermined.
LPT Semiconductor has previously introduced the wireless communication LSI for specific low-power wireless base stations in the SubGHz band, and has contributed to the global realization of intelligence through wireless communication. This time, we are developing an LPWA wireless communication LSI that supports multiple methods for building an early IoT network and effectively popularizing services and applications.
1. As LPWA wireless communication method, support Sigfox and IEEE802.15.4k two ways
The ML7404 is a dual-mode LPWA wireless communication LSI that supports the international standard IEEE802.15.4k, not only for Sigfox, which has been deployed in the Japanese metropolitan area since the spring of 2017.
(1) Support Sigfox, which started operations in the spring of 2017
Support for Sigfox. Sigfox is an LPWA wireless system with practical operations in more than 30 countries and regions in Europe, and is deployed in Japan in the spring of 2017.
(2) Comply with the international standard IEEE802.15.4k protocol
Supports the 802.15.4k protocol specified by IEEE. The protocol is characterized by DSSS Note 2 based on orthogonality spreading codes. Compared with other spread spectrum wireless communication methods, it is resistant to the same system interference wave and can accommodate more terminals in the network. Highly reliable reliability is recognized in the unlicensed and versatile SubGHz band.
2. The industry's first hardware implementation of BPSK modulation circuit used by Sigfox helps applications achieve lower power consumption
Sigfox uses BPSK modulation that was not used in previous SubGHz wireless. In the past, wireless communication LSIs that support Sigfox do not support BPSK modulation. Therefore, it is necessary to create BPSK symbol data through the software of the microcontroller. This method must drive the microcontroller every time wireless communication is performed, so that the application generates unnecessary power consumption. The ML7404 not only supports Sigfox, but also hardwareizes the BPSK modulation circuit.
In this way, the microcontroller does not need to involve the physical layer of wireless communication during the wireless communication work, so that the communication system can achieve lower power consumption.
3. Development support system is perfect
Lan Bi Shi provides customers with a comprehensive support system. Sample programs (simple MAC) and various test scenarios are integrated into the evaluation kit. Modular reference design information is available. Moreover, users can log in to the support page of the official website of Lanshi Stone Semiconductor, and download various manuals and tools.
In addition, the communication module equipped with this product and the low-power protocol stack for IEEE802.15.4k will be available for sale from the company of Lanshishi.
ã€specification】
※ The reference varies depending on the communication conditions and the surrounding environment.
ã€Sales Plan】- Product Name: ML7404
- Sample sale time: from July 2017
- Sample price (reference): 1000 yen (excluding tax)
- Mass production sales plan: from December 2017
- Mass production scale: 100,000 monthly production
-Packing: Tape & Reel 1000
ã€Applications】All industrial equipment requiring smart meters such as gas meters/water meters, sensor networks, building health monitoring, intelligent agriculture, disaster prevention, and other long-distance wireless communications
[terminology commentary]Note 1: IEEE802.15.4k
Long-range wireless standard in the IEEE standard of international standards. The receiving sensitivity is improved by direct spread spectrum to achieve long-distance communication.
In the IEEE 802 series, physical layers such as wireless LAN, Bluetooth, ZigBee, and Wi-SUN have also been standardized.
Note 2: DSSS (Direct Sequence Spread Spectrum)
A spread spectrum method. The acquisition baseband signal is spread and transmitted in the frequency band. Noise such as interference waves during communication is spread by despreading at the time of reception, and therefore has excellent communication robustness (Robustness).
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