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M5Stack Atom DTU NBIoT2 Wireless Data Transmission Units
M5Stack Atom DTU NBIoT2 v1.1 Wireless Data Transmission Units (DTUs) are programmable DTUs designed for global Cat-NB frequency bands. These M5Stack DTUs are upgraded from the previous generation, adding an I/O expansion chip to enable control of the communication module power enable and software reset. These features reduce power consumption and ensure the SIM module can be reset without power cycling when abnormal conditions occur. Atom DTU NBIoT2 DTUs include an analog-to-digital converter (ADC) monitoring circuit that supports real-time acquisition of the input power voltage from the HT3.96-4P interface, enabling power status monitoring. These DTUs integrate a SIM7028 communication module and use UART communication (controlled via AT command set).