Overview
1. Overview
1.1 Description of the Module
Figure 1:
Block circuit diagram of CPCI-CAN/331
The CPCI-CAN/331 module is a CAN interface board for the CompactPCI bus. It uses a 68331-
microcontroller, which cares for the local data management. The CAN data is buffered in a local
SRAM. Data security and consistency are guaranteed up to 1 Mbit/s.
The ISO 11898-compliant CAN interface allows a maximum data-transfer rate of 1 Mbit/s. Among
many other features of CAN interfaces, the bit rate can be set by software.
The CAN interface is electrically isolated from the other potentials by means of optocouplers and
DC/DC-converters.
CPCI-CAN/331
Hardware Manual • Doc. No.: C.2027.21 / Rev. 2.2
Page 9 of 37
+5 V=
+5 V=
Microcontroller
68331
SRAM
Arbiter
+5 V=
+5 V=
C
A
N
B
U
S
CAN
CAN
IRQ A
Physical
CAN
Layer
C
A
N
B
U
S
electrical isolation
DC/DC
Converter
DSUB9
CiA pinning
CAN Controller
SJA1000
Flash EPROM
PCI Bridge
PLX9050
electrical isolation
DC/DC
Converter
CompactPCI Connector
CAN Controller
SJA1000
Physical
CAN
Layer
DSUB9
CiA pinning
2nd CAN Interface
only at
CPCI-CAN/331-2