Atom DTU NBIoT2 v1.1
SKU:A106-V21
Description
Atom DTU NBIoT2 v1.1 is a programmable NB-IoT wireless Data Transmission Unit (DTU) designed for global Cat-NB frequency bands. Upgraded from the previous generation, it mainly adds an IO expansion chip to enable control of the communication module power enable and software reset, which helps reduce power consumption and ensures that the SIM module can be reset without power cycling when abnormal conditions occur. At the same time, an ADC monitoring circuit has been added, supporting real-time acquisition of the input power voltage from the HT3.96-4P interface to enable power status monitoring. This unit integrates the SIM7028 communication module and uses UART communication (controlled via AT command set). It features an SMA external antenna interface, providing good communication quality and signal stability. The SIM7028 module supports multiple Cat-NB frequency bands and can be used worldwide. Compared with conventional DTUs that only support data transparent transmission, the Atom DTU series adopts a more open architecture design. Multiple interfaces (RS485, I2C / custom Grove interface) are reserved for user expansion, facilitating rapid connection of sensors and actuators. The built-in DIN rail mounting structure allows installation in various industrial control environments, making it suitable for low-latency, low-throughput scenarios such as remote control, asset tracking, remote monitoring, telemedicine, and shared bicycles.
Features
- Global version / multi-band support, suitable for worldwide use
- SIM7028 module, AT command control
- Micro-SIM IoT card
- IO expansion chip for communication module power enable and software reset control
- ADC monitoring circuit supporting power status monitoring
- External SMA antenna interface
- Reserved RS485, I2C / custom Grove interfaces
- Data rate (kbps): 127 (DL) / 159 (UL)
- Supports multiple network protocols such as MQTT and HTTP
- Multiple power supply methods
Includes
- 1 x Atom DTU NBIoT2 v1.1
- 1 x 850 ~ 1900 MHz SMA rubber antenna
- 1 x Hex Key L-Shape 1.5mm (For M2 Screw)
- 1 x M2 * 16mm cap head machine screw
- 1 x HT3.96-4P Terminal
- 1 x I/O Sticker
Applications
- Asset tracking
- Remote monitoring / control
- Shared bicycles
Specifications
| Specification | Parameter |
|---|---|
| Communication Module | SIM7028 |
| Supported Cat-NB Band | B1/B2/B3/B4/B5/B8/B12/B13/B14/B17/B18/B19/B20/B25/B26/B28/B66/B70/B85 |
| Network Protocol | TCP/UDP/HTTP/TLS/DTLS/DNS/NTP/PING/LWM2M/COAP/MQTT/MQTTS/SSL |
| Carrier | Deutsche Telekom / Vodafone / Telefonica / China Telecom / China Mobile / China Unicom |
| Communication Method | UART 115200bps @ 8N |
| IO Expansion Chip | M5IOE1 |
| Antenna Specification | Size 108 x 10mm, connector type SMA (male thread, female pin), operating band 850 ~ 1900 MHz, gain 2.0 ± 0.5, VSWR ≤ 3.0 |
| Power Supply | RS485 port (HT3.96R-4P interface): 9 ~ 24V USB Type-C: 5V |
| Power Consumption | SIM module powered off: 24V@9mA (RS485 power); 5V@2.61mA (USB power) Standby: 5V@8.82mA Working (continuous TX/RX): 5V@43.91mA |
| Grove Load Capacity | DC 5V@1.3A (RS485 power supply) |
| Operating Temperature | 0°C ~ 40°C |
| Installation Method | DIN rail mounting / mounting holes |
| Product Size | 64.3 x 24.0 x 28.7mm |
| Product Weight | 30.0g |
| Package Size | 170.0 x 120.0 x 27.0mm |
| Gross Weight | 51.2g |
RS485 Communication Test
- Test conditions: 120Ω termination resistor added to A/B
| Communication Distance | Data Rate |
|---|---|
| 100 m | Maximum data rate 512Kbps, normal TX/RX, packet loss 0%, error rate 0% |
Schematics
PinMap
| PIN | LEFT | RIGHT | PIN |
|---|---|---|---|
| 1 | 3V3 | ||
| PORT.A | 2 | 3 | NBIoT2_UART_RX |
| PORT.A | 4 | 5 | NBIoT2_UART_TX |
| 5V | 6 | 7 | RS485_TX |
| GND | 8 | 9 | RS485_RX |
Model Size
Datasheets
- SIM7028_Specification
- SIM7028 Series_Network Searching_Application Note_V1.00
- SIM7028 Series_Low Power Mode_Application Note_V1.01
- SIM7028_NCC_Certificate_20230421
- SIM7028 Series_TCPIP_Application Note_V1.04
- SIM7028 Series_SSL_Application Note_V1.00
- SIM7028 Series_MQTT(S)_Application Note_V1.03
- SIM7028 Series_LwM2M_Application Note_V1.02
- SIM7028 Series_HTTP(S)_Application Note_V1.04
- SIM7028 Series_FOTA_Application Note_V1.00
- SIM7028 Series_COAP_Application Note_V1.00
- NB-EVB_User_Guide_Manual_V1.00
- RSU062-EE-EUT Photo-SIM7028
- RSU062-E6-CE EMC Test Report
- RSU062-E5-3GPP (LTE Band 5) Test Report
- M5IOE1 IO Expansion Management Chip
Softwares
Arduino
- Atom DTU NBIoT2 v1.1 Arduino Quick Start
- Atom DTU NBIoT2 v1.1 Arduino IO Expansion Driver Library
- TinyGSM Driver Library
Protocol
Video
- Atom DTU NBIoT2 v1.1 Product Introduction and Feature Demonstration
Product Comparison
| Product Compare | Atom DTU NBIoT2 v1.1 | Atom DTU NBIoT2  | Atom DTU NBIoT  |
|---|---|---|---|
| Included Atom | Not included | AtomS3-Lite | Atom-Lite |
| Communication Module | SIM7028 | SIM7028 | SIM7020G |
| Cat-NB Band | B1/B2/B3/B4/B5/B8/B12/ B13/B14/B17/B18/B19/B20/B25/ B26/B28/B66/B70/B85 | B1/B2/B3/B4/B5/B8/B12/ B13/B14/B17/B18/B19/B20/B25/ B26/B28/B66/B70/B85 | B1/B2/B3/B4/B5/B8/B12/ B13/B17/B18/B19/B20/B25/B26 /B28/B66/B70/B71/B85 |
| Data Rate | 127 (DL) / 159 (UL) | 127 (DL) / 159 (UL) | 126 (DL) / 150 (UL) |
| Module Power Enable | IO Expansion Chip Control | Direct Power Connection | Direct Power Connection |
| Module Reset | IO Expansion Chip Control | None | None |
| Power Status Monitoring | IO Expansion Chip ADC Sampling | None | None |