CAN Bus Interface
The CAN bus lines carry the signals:
n CANL: CAN_L bus line dominant low for the CAN channels
n CANH: CAN_H bus line dominant high for the CAN channels
Objective
Information in this section
Hardware details
I/O Circuit and Electrical Characteristics 193
Connecting CAN Devices 194
Information in other sections
Feature description
CAN Support ( DS1103 Features)
The board has a CAN interface to communicate with CAN devices.
I/O Circuit and Electrical Characteristics
The CAN interface is based on the Siemens SAB 80C164 micro
controller. For specifications refer to the SAB 80C164 data sheet
(available at http://www.siemens.com).
The CAN bus lines have input/output levels in accordance with the
published electrical specifications for the CAN High-Speed standard
(ISO 11898-2).
Electrical Characteristics
Parameter Value
Output
voltage
TX1‑TX0 State V
CAN_H
V
CAN_L
V
Diff_(H-L)
> 0 Recessive +2.5 V +2.5 V –0.5 V – +0.05 V
< 0 Dominant +3.5 V +1.0 V +1.5 V – +3.0 V
Clock frequency 10 MHz … 20 MHz
Baud rate Max. 1 Mbit/s
Power-up default n The CAN controller is reset.
n During power‑up the CAN controller runs with 12.59
MHz clock frequency.
Where to go from here
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CAN Bus Interface
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DS1103 Hardware Installation and Configuration November 2014
193
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