LTEm3F (Oct 2022)

Photo is of the CR-LTEM3F prototype, minor usability adjustment have been incorporated into the design for v1.61a which will the official first production model. The production devices are planned for distribution availability around October 15th.

Changes…

• SIM card holder has moved closer to edge to make card insertion\removal easier

• GPIO/ADC connections have been moved to card edge using a Molex pico-blade connector to lower vertical profile and make I/O connection compatible of-the-shelf ribbon assemblies

• Added host reset button to allow for that functionality when mounted above a Feather host board

• Moved all connections to top of board for easier assembly and verification

Features

• Quectel BG77 low-power LTE cellular module

  • LTE CAT-M1 and NB-IOT

  • Up to 588 kbps (DL)/ 1119 kbps (UL)

  • Advanced network interactive power saving modes including PSM and eDRX

• GNSS (GPS in US) location support with option power injection for active GNSS antenna systems

• USB interface with 3 virtual ports for AT, diagnostics/firmware, NMEA sentence output

• Low-power 3.3v device with independent LDO for local needs (sourced from Feather battery pin)

• Nano SIM socket compatible with all major carriers and MVNO providers

• High-speed buffered SPI interface

• LooUQ LTEmC software driver

  • C99 for portability, compatible with Arduino and other frameworks

  • Full method coverage for network management, protocols, file system, and GPIO/ADC

  • No AT command knowledge required, LTEmC manages it for you

• Communication Protocols

  • HTTP/HTTPS

  • MQTT/MQTTS

  • Sockets (TCP/UDP) with SSL support

• 6GB of persistent file system storage

• 7 GPIO ports

• 2 A/D ports (3.3v ref)

• 2 status indicators: power, network (can be disabled for power savings)

3D Step View