Wireless chip targets 868 MHz Wireless M-Bus applications

Wireless chip targets 868 MHz Wireless M-Bus applications

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By eeNews Europe

The 868MHz band Wireless M-Bus data transmission protocol for smart meters is likely to become popular in Germany and the surrounding countries and ultimately adopted as the mainstream communication method in Europe. It has three modes. Signals must be discriminated differently for each mode based on the operating function. The ML7406 supports the frequency band from 750MHz to 960MHz, making it also compatible with the ARIB STD-T108 standard in Japan as well as the global standard IEEE802.15.4g.

The chip integrates a Wireless M-Bus packet handler designed to perform hardware-based processing of a variety of functions, such as simultaneous standby for interoperability between C and T Modes, automatic discrimination of Format A and B messages in C Mode, and address filtering that automatically distinguishes whether packets are intended for this or other devices. As a result, microcontroller operating rate is reduced by about 20% compared with conventional software-based systems, significantly cutting device power consumption. Lapis Semiconductor can supply sample software and C source code that include all of the T, C, and S Mode functions compatible with EN113757-4:2011 in the Wireless M-Bus protocol stack. An industry-standard OMS-compatible protocol stack usable without modification in OMS-based meters, along with Wireless M-Bus protocol analysis software, can be licensed from Steinbeis.

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