Overview
1. Overview
1.1 Description of the Module
Figure 1:
Block circuit diagram of CAN-PC104/331-2
The CAN-PC104 board is a CAN module designed for the PC/104-bus (PC/104 16 bits). It uses a
68331 microcontroller, which cares for the local management. The CAN data is buffered in a local
SRAM. Security and consistency of data is guaranteed up to 1 Mbit/s.
The ISO 11898 compliant CAN interface allows a data-transfer rate of a maximum of 1 Mbit/s.
Among many other features, the bit rate can be set by software.
The CAN interface is electrically separated from other voltage potentials by means of optocouplers
and DC/DC converters.
In the CAN-PC104-331-2-MicroMatch option, the CAN interfaces are equipped with Micro-Match
sockets instead of the DSUB-9 connectors.
Page 8 of 32
Hardware Manual • Doc. No.: C.2012.21 / Rev. 1.6
CAN-PC104/331
+5 V=
+5 V=
Microcontroller
68331
SRAM
Arbiter
+5 V=
+5 V=
C
A
N
B
U
S
CAN
CAN
C
A
N
B
U
S
electrical isolation
DC/DC
Converter
DSUB9
CiA pinning
CAN Controller
SJA1000
Flash EPROM
electrical isolation
DC/DC
Converter
DSUB9
CiA pinning
PC/104 Connector
FIFO
512 bytes
Tx Data
FIFO
512 bytes
Rx Data
IRQ
Physical
CAN
Layer
CAN Controller
SJA1000
2. CAN Interface
only at
CAN-PC104/331-2
Physical
CAN
Layer
