Instructions

238Libraries

only used today in the automotive industry, but also in the areas of automation, aviation, aerospace

and medical technology.

The C-Control Manual cannot provide an introduction to the CAN standard, due to the complex-

ity of the topic. Prior knowledge about the CAN standard and Full CAN message objects are as-

sumed at this point. It is therefore recommended that beginner to embedded controllers will not work

directly with the CAN bus. A good summary of CAN and Message Objects provides the "Atmel

AT90CAN" Reference Manual Chapter 19, "Controller Area Network - CAN".

MEGA128CAN

The CAN signals of the C-Control Pro MEGA128CAN are available on pins X4_13 (CANL) and X4_14

(CANH) .

AVR32Bit

In the C-Control Pro AVR32Bit there is a CAN controller that operates two channels. But only the

first channel is connected to a transceiver, which is led out on the application board. On the Main-

board CAN1 is led out through a socket connector (without transceiver). The lines CANH and CANL

are passed out on the module connector X1. To use the second channel, the user must connect a

transceiver himself. As an example, the data sheet of the AVR32 module can be used. The second

Controller is on Port 1 (CAN_TX, PA00) and Port 2 (CAN_RX, PA01).

Network

Multiple CAN-bus network participants can be connected over the two pins (CAN-H and CAN-L). The

first and last stations have to be completed with a 120 Ohm resistor. As a data cable, a twisted pair

cable should be used. For shorter distances of a few centimeters up to 2 meters, even a simple par-

allel cable (twin lead) can be used.

The UNIT supports the low- and high-speed bus (MEGA128CAN 10 kbit/s to 1 Mbit/s, AVR32Bit 50

kbit/s to 1 Mbit/s). For theoretical line lengths, depending on the bus speed, see the chart below.

Speed

Cable Length

1 Mbit/s

40m

Up to 500 kbit/s

100m

Up to 125 kbit/s

500m