Main Board Specifications - US Robotics USR3520 User Manual

Main Board Specifications

The gateway is designed with one main board and two additional expansion boards.
Main Board
The main board is identical for each base unit and is designed around a micro-controller which controls
a WWAN module and the Ethernet interface.
Main Board Block Diagram (PDF) -->
Internal Power Supply

Stable 3.4V power rail

Reverse polarity protection

Over-voltage protection up to 60V

Current limiter at 1.2A

One-time fuse of 2A
Main Board Processor

Freescale i.MX280 @ 450MHz
o 64 MB RAM
o 128 MB Flash memory
o GTM68X WWAN module1 m
o Ethernet interface
o Two expansion board connectors
Primary Expansion Board
The primary expansion board has the following interfaces:

Power supply: V_PWR, 3V4, 3V3

24 MHz clock signal

Master reset signal

High speed USB interface

High speed OTG USB interface

SDIO interface

GPIO signals

Serial interface
Secondary Expansion Board
The secondary expansion board has the following interfaces:

Power supply: V_PWR, 3V4, 3V3
Revision: 1.00
http://support.usr.com/support/3510/files/m2m_box_im_0_0.pdf
Copyright 2015 U.S. Robotics Corporation 78 | P a g e