CAN Bus

Controller Area Network
Input/Output Circuits

[CAN Bus Description]
[CAN Bus Pin-Out] [CAN Bus Interface ICs] [Other Interface Buses]
[CANBus OnLine Standards] [CAN Higher Layer Protocols]
[Engine Diagnostic Products, Amazon]

CAN Bus I/O Description

The Controller Area Network (CAN) specification defines the Data Link Layer, ISO 11898 defines the Physical Layer.

The CAN Interface is a Balanced (differential) 2-wire interface running over either a Shielded Twisted Pair (STP), Un-shielded Twisted Pair (UTP), or Ribbon cable. Each node uses a Male 9-pin D connector. The Bit Encoding used is: Non Return to Zero (NRZ) encoding (with bit-stuffing) for data communication on a differential two wire bus.


CANbus Equivalent Block Diagram
CAN Bus Transceiver Block Diagram




A number of different data rates are defined, with 1Mbps (Bits per second) being the top end, and 10kbps the minimum rate. All modules must support 20kbps. Cable length depends on the data rate used. Normally all the devices in a system transfer uniform and fixed bit-rates. The maximum line length is 1Km, 40 meters at 1Mbps. Termination resistors are used at each end of the cable.

The inputs and output lines are protected by zener diodes.
For the single ended lines a diode is taken from the net to ground.
For the differential lines a zener diode is added both between the input and ground and the input and Vcc.

CANbus Equivalent interface Circuit
CAN Bus Equivalent Input Circuit

The supply voltage range for this chip is between 3.0v and 3.6 volts.
The maximum input voltages for this particular IC is -2v to 7 volts to ground or -6v to 6 volts differential.


CANbus Equivalent interface Circuit
CAN Bus Equivalent Output Circuit

Typical output voltages are 2.4v [Voh] and 0.4v [Vol] for the receiver [R].
While the CANH line can range up to 7 volts, and the CANl line line down to -2 volts.

CANBus Voltages and Current
Can Voltages and Currents

CANbus is used as a vehicle bus, for other vehicle Buses see Automotive Buses.
CANbus is also used as an Industrial Field bus, for other Field Buses see Field Buses.

{Industrial CANbus Index}

CAN Bus Interface ICs

CAN Bus uses a Drive Voltage: High; 2.75v to 4.5 volts, Low; 0.5 to 2.25 volts, Differential 1.5v to 3.0 volts





CAN Bus Interface IC Logic Levels
CAN Bus Interface IC Logic Transition Levels

Analog Devices, Inc. {Mixed-Signal-DSPs (ADSP-21992) with 160MIPS and On-Chip CAN V2.0b}

Atmel Corp. {8-bit RISC transceivers and microcontrollers. CAN bus standard (2.0A & 2.0B) with 80C51 core and AVR core}

Bosch {IP Modules; CAN Core, C_CAN, D_Can, TTCAN}

Cast {CAN Core, Bus Controller ICs}

Dallas Semiconductor 'Maxim' {DS80C390 Dual CAN High-Speed Microprocessor, bus controller ICs}

freescale {33389/33388 low speed fault tolerant CANBus transceiver}

Infineon {82C900 Stand-alone TwinCan Controller-TLE6250 CAN Transceiver IC Manufacturer}

Inicore Inc. {CAN IP Core IC Manufacturer}

Intel {CanBus Interface 82527 IC}

Linear Technology {CAN Transceiver IC Manufacturer}

Maxim Integrated Products {DS80C390 Dual CAN High-Speed Microprocessor, bus controller IC}

Melexis {CAN Bus Transceiver IC Manufacturer}

Microchip {MCP2510 Stand-alone CanBus Controller IC}

National Semiconductor {uP with CANBus Interface}

NXP {8/16-bit CAN Bus 2.0 Controllers/Transceiver}

Renesas Technology Corp {Micro-Controller [uC] with CAN / LIN Interface}

STMicroelectronics {uP with CAN Interface}

Xilinx {CAN IP Core, Spartan, Virtex}

Yamar Electronics {DC-BUS for digital communication overcome hostile in-vehicle power line communication environment. Power line Communication multiplex semiconductor transceivers for automotive and industrial CAN, LIN networks.}

TI {TMS320F241 with CANbus Interface-3.3v Line Transceiver ICs}

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Modified 3/04/12
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