Compact LTE-M / NB-IoT module by u-blox has 2G fallback capability 

The LEXI-R4 is a compact module that has been customised for applications where space is limited. It has dimensions of 16 x 16mm and supports all LTE-M and NB-IoT bands with an RF output power of 23dBm. It also has the possibility to operate on a 2G network. Typical applications are small asset trackers, such as pet and personal trackers, micromobility devices and luggage tags. It is also able to encompass larger applications, such as alarm systems, vending machines and stolen vehicle recovery systems, advised u-blox. 

The u-blox LEXI-R4’s compact dimensions are a 40 per cent footprint reduction compared to the company’s u-blox SARA-R4. The space gained can be used to host larger antennas, which can improve radio frequency (RF) performance, or to accommodate larger-size batteries.

It also has 2G fallback capability. Whenever LTE-M / NB-IoT coverage conditions are not optimal, it will keep functioning by falling back onto a 2G network. This is practical and convenient in countries where LTE-M / NB-IoT networks have yet to be fully deployed. 

The module is natively designed to support GNSS (Global Navigation Satellite System) AT commands and is also ready for GNSS bundling. Its dedicated port enables easy integration with any u-blox M10-based GNSS module, for instance the u-blox MIA-M10, to improve performance and lower power consumption, said u-blox. The module can also connect to additional positioning services such as AssistNow and CellLocate.   

“Since the module supports the u-blox M10 GNSS platform, customers save execution time and resources,” says Samuele Falcomer, senior product line manager, product centre cellular at u-blox. 

The module’s AT commands and a dedicated I2C port can operate the GNSS core to eliminate the need to integrate additional code into the MCU. “In addition, the LEXI-R4 module offers a single SKU with global LPWA (low power wide area) coverage that simplifies logistics,” added Falcomer.

The first samples will be available by the end of Q3 2023. 

u-blox provides positioning and wireless communication in automotive, industrial, and consumer markets. Its services and products let people, vehicles and machines determine their precise position and communicate wirelessly over cellular and short range networks. The company offers a broad portfolio of chips, modules, and secure data services and connectivity, to empower developers to introduce solutions for the IoT, quickly and cost-effectively. The company has headquarters in Thalwil, Switzerland and offices in Europe, Asia, and the USA.

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