Lapis semiconductors, a Roma group company, recently announced the launch of a multi band (Sub-1GHz / 2.4GHz) wireless communication chip ml7421 for low-power transmission over long distances, such as smart meters, gas / fire alarm, intelligent agriculture and home / building safety systems.
Lapis semiconductor, a Roma group company, recently announced the launch of a multi band (Sub-1GHz / 2.4GHz) wireless communication chip ml7421, which aims at low-power transmission over long distances, such as smart meters, gas / fire alarm, intelligent agriculture and home / building safety systems.
In recent years, with the increasing demand for improving energy efficiency, in order to meet this demand, since 2015, the application of smart meters has increased rapidly, and the wireless M-BUS system has also been launched in Europe. At the same time, wireless network collection and management of sensor data, not only can optimize the building energy consumption and lighting, but also can be used for security and disaster prevention. In addition, these wireless sensor networks can also be used to improve agricultural productivity.
In response, lapis semiconductor has developed a new wireless communication LSI ml7421, which can provide high-performance communication. In addition to covering frequency bands below 1GHz (400MHz to 960MHz), it also covers 2.4GHz frequency band, providing universal compatibility. The LSI has very stable wireless characteristics even under varying environmental parameters (such as voltage and temperature fluctuations). In the whole temperature range (- 40 to + 85 ℃), the fluctuation of TX output power is only 0.5dB, and the fluctuation of RX Sensitivity is only 1.0db. In addition, compared with traditional Lapis products, the DC / DC converter, efficient class E power amplifier and high-speed radio wave inspection function reduce the average current consumption by 15%, thus reducing the system power consumption and prolonging the battery life.
Lapis semiconductor hopes that the new LSI with low power consumption and global compatibility will be adopted in smart meters and wireless networks around the world, so the most important thing is to meet the global compatibility and have stable performance in any country and any climate.
1. Multi band stable wireless characteristics and global compatibility
Ml7421 supports Sub-1GHz (400MHz to 960MHz) and 2.4GHz. In the past, it was necessary to select different wireless LSIs for each country / region and develop equipment for them. Now, equipment can be deployed globally through the common 2.4GHz band. In addition, in the unstable environment of 2.4GHz communication, long distance communication below Sub-1GHz can be used. Therefore, depending on the application or environment, 2.4GHz and Sub-1GHz can be used as bridging communication. Ml7421 can be used in radio stations conforming to ETSI en 300200, FCC Part15 and ARIB std-t66, t67, t108, and has multiple packet processing functions based on wireless M-BUS and ieee802.15.4g. In addition, the LSI has very stable wireless characteristics even when the environment changes, such as voltage and temperature fluctuations. In the whole temperature range (- 40 to + 85 ℃), the fluctuation of TX output power is only 0.5dB, and the fluctuation of RX Sensitivity is only 1.0db. In addition, the improved delta sigma ADC can achieve flexible data rate demodulation of up to 300 Kbps worldwide, while improving receiver sensitivity. Therefore, ml7421 is suitable for outdoor devices, such as smart meters and various IOT sensors. These stable features make it possible to further extend remote communication through high-power amplifiers.
First class environmental stability
2. The DCDC converter reduces the working current consumption, and the high-speed radio wave inspection function reduces the average current consumption
After years of low-power design technology, lapis semiconductors can reduce average current consumption by 15% (in 5-second intervals, including sleep mode, transmitter (TX) mode and receiver (Rx) mode during normal sensor operation. The improved DCDC converter and high efficiency class E power amplifier can reduce the current consumption of transmitter (TX) mode to 13dbm (output 13dbm). In addition, the high-speed radio wave check function reduces the time required to start reception, thus minimizing the total time for receiver strength detection (about 1 ms). As a result, the power consumption of wireless nodes in the network is reduced, which helps to reduce the system power consumption and prolong the battery life.