CGARM7/GTI CAN/CAN Gateway
1
EMS Dr. Thomas Wünsche
1 Overview
1.1 Features
•Connection of CAN subnetworks with differing data rates
•Filtering and buffering of data traffic
•Support for 11 bit and 29 bit identifier
•Microcontroller NXP LPC2119 with 2 internal CAN controllers
•Serial interface for configuration
•Galvanic separation between CAN channels
•Galvanic separation between CAN channels and power supply
•Optional (Version HS/LS) with 1 high speed (82C251) and one low speed
(TJA1054) transceiver available
•Optional (Version LS/LS) with 2 low speed (TJA1054) transceiver available
1.2 General Description
The CAN/CAN gateway CGARM7/GTI transmits CAN signals
between subsystems. CGARM7/GTI allows a flexible design of the
wiring topology. Star and tree structures as well as extensive line
structures can be realised. The galvanic separation between the
CAN channels allows the use with diverging ground potentials.
Among the available functions are data rate adaption, message
filtering as well as identifier conversion between the coupled busses.
The restriction of the maximum data rate depending on cable length
for single CAN segments can be abolished for the overall system by
the use of CGARM7/GTI.
CGARM7/GTI obtains its potential by using a 32bit microcontroller
with 48MHz clock. High speed processing and low latencies allow
the use with high data rates and bus loads.
The configuration of the device functions can take place either
through CAN or through the builtin RS232 interface. Download
software for the configuration is available for Windows PCs as well
as Linux PCs .
For special tasks, like modification of the data content of the CAN
messages, we over a development kit to write custom specific
firmware for CGARM7/GTI.
