LimeNET-Micro v2.1 hardware description

LimeNET-Micro Board Key Features

LimeNET Micro makes deploying wireless networks more accessible than ever before, by extending the LimeNET line of integrated hardware solutions via an ultra-low cost platform that is capable of supporting narrowband systems, such as GSM and IoT wireless standards, in a stand-alone configuration.

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Figure 1. LimeSDR-Micro v2.1

LimeNET-Micro board features:

• RF transceiver
  • Lime Microsystems LMS7002M
• Raspberry Pi
  • DDR2 SODIMM socket for raspberry Pi CM3(L)
  • 2x downstream USB 2.0 ports
  • Upstream Micro-USB for USB boot of Compute Module
  • 3.5mm analog audio, composite video output
  • Ethernet + active PoE (RJ45) connector
  • Ribbon cable camera and display connectors
  • HDMI connector
  • External UART connector
  • uSD card slot
  • USB2.0 HUB and 10/100 Ethernet controller
  • SDIO Wi-Fi module
  • Jumper for Raspberry boot mode selection
• FPGA Features
  • Intel MAX10 10M16SAU169C8 device in 169-pin UBGA
  • 16K logic elements
  • 549 Kbits embedded memory (M9K) and 2368 Kbits of user Flash Memory
  • 45 embedded 18x18 multipliers
  • 1 PLLs
• FPGA Configuration
  • JTAG mode configuration
• USB Controller
  • FTDI FT601 USB to FIFO interface bridge chip (connects FPGA to USB2.0 HUB)
• Memory Devices
  • 4Mbit FLASH (for FPGA data)
  • 2x 128Kbit (16K x 8) EEPROM (for LMS MCU firmware and FPGA data)
• Other Devices
  • Temperature sensor
  • Crypto Authentication Device
  • GNSS receiver
• Connections
  • 2 x coaxial RF (SMA) connectors
  • SMA connectors for reference clock IN/OUT, GNSS and Wi-Fi antennas
  • 5V DC power jack
  • 5V header for powering external devices
  • Fan header
  • FPGA JTAG connectors (0.05” pitch and side connector)
  • Backup battery connector for GNSS receiver
• Clock System
  • 30.72MHz VCOCXO:
    • Frequency calibration ±0.5ppm;
    • Frequency stability over temperature in still air ±20ppb;
    • Frequency slope ΔF/ΔT in still air ±1.2ppb/°C
  • Possibility to tune VCOCXO by onboard DAC
  • Possibility to use GNSS PPS signal as a reference when tuning VCOCXO frequency
• User I/O
  • GPIO header (0.05” pitch) connected to FPGA
  • 5X dual color (RG) LEDs connected to FPGA
  • Push button connected to FPGA
  • Buzzer connected to FPGA
• Board Size: without connectors 125mm x 65mm (4.92” x 2.56”)

For more information on the following topics, refer to the respective documents:

• FT601 controller resources [link]
• MAX10 device family, refer to Intel documentation [link]
• LMS7002M transceiver resources [link]