User manual

CG-ARM7/D/E CAN/CAN Gateway
5
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
• USB interface for configuration and firmware download
• Extended supply voltage range
• Extended temperature range
• 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 CG-ARM7/D/E is designed for applications
where there is demand for high flexibility. Both the supply voltage
range and the operating temperature range are extended in a way
that the use in automotive applications is possible. With the
development kit and the ability to use its USB interface for download
and power supply purposes CG-ARM7/D/E performs as a versatile
development platform for CAN/CAN gateway applications. Firmware,
which has been developed on this device can also be run on CG-
ARM7/RMD and CG-ARM7/GTI.
Among the available functions of the standard firmware 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 over-all system by use the CG-ARM7/D/E.
Bandwith adaption from high speed to low speed CAN systems is
inherited from the filtering capability for the version HS/LS with one
high speed and one low speed CAN transceiver.
CG-ARM7/D/E obtains its potential through the use of a 32 bit
microcontroller with 48MHz clock. High speed processing and low
latencies allow the use with high data rates and busloads.