Automotive Controller Area Network (CAN) Applications Overview co
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In-Vehicle Networking
Automotive Controller Area Network (CAN) Applications
Overview controller area network (CAN) serial, asynchronous, multi-master communication protocol connecting electronic control modules automotive industrial applications. designed automotive applications needing high levels data integrity data rates Mbit/s. Freescale Semiconductor complete line products enable automotive electronics designers incorporate into their applications. Benefits automotive networking standard protocol Europe Supports automakers migration body electronics busses Provides plentiful proven Freescale Semiconductor products tools Exists levels Freescale Semiconductor microcontrollers DSPs Provides connectivity increased integration using Freescale Semiconductor physical layers System Basis Chips
AUTOMOTIVE NETWORKS
Engine Management Module Adaptive Cruise Control Module Active Suspension Control Module Transmission Control Module Diagnostic Port Gateway Diagnostic Connector Instrument Cluster/ Powertrain-Body Gateway Central Body Control Module HVAC Climate Module SUB-BUS Steering Column/ Ignition Module SUB-BUS Driver Seat Module SUB-BUS Driver-Side Door Module SUB-BUS Passenger Seat Module SUB-BUS Passenger-Side Door Module SUB-BUS Rear Seat Module SUB-BUS Occupant Safety Gateway Multimedia Gateway/ Telematics Module FlexRay
MOST
Rear Lighting/ Trunk Control
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Freescale Ordering Information
Part Number HC08 HC08 family MC68HC908AZxx family HC12 HC12 family XC68HC912BCxx family MC68HC912Dxx(A) family MC68HC912DG128A MC68HC912DT128A HCS12 HCS12 family MC9S12DPxx family MC9S12DTxx family MC9S12DJxx family MC9S12DGxx family MC9S12Dxx family MC9S12Hxx family MC9S12Cxx family 32-Bit Microcontrollers MPC555/6LFMZP40(R2) MPC561/2LFMZP40(R2) MPC563/4LFMZP40(R2) MPC565/6LFMZP40(R2) Devices DSP56F803BU80 DSP56F805FV80 DSP56F807PY80 DSP56F807VF80 MPC5200 32-bit Processors MPC5200 Devices MC33388 MC33389A MC33389C MC33889 MC33989 low-speed fault tolerant physical interface System Basis Chip, dual Vreg, LSCAN, watchdog, three wakeup inputs System Basis Chip lite with low-speed CAN, dual Vreg, enhanced power mode management, wakeup inputs System Basis Chip with high-speed CAN, dual Vreg, four wakeup inputs, enhanced power mode management. with ISO11898, J2284 networks Single-wire transceiver specific). with J2411 networks www.freescale.comNote MSCAN12 2.0a/2.0b overview/SPSMPC5200.htmNote 16-bit (DSP/MCU) with MSCAN12 module 16-bit (DSP/MCU) with MSCAN12 module 16-bit (DSP/MCU) with MSCAN12 module 16-bit (DSP/MCU) with MSCAN12 module www.freescale.comNote TouCAN modules TouCAN modules TouCAN modules TouCAN modules www.freescale.comNote 512K Flash ROM, ESCI, three SPI, modules, clock generators, excellent stop Idd. MSCAN12 (rev. 2.0) modules MSCAN12 (rev. 2.0) modules MSCAN12 (rev. 2.0) modules, BDLC (J1850) module MSCAN12 (rev. 2.0) modules MSCAN12 (rev. 2.0) module MSCAN12 (rev. 2.0) modules MSCAN12 (rev. 2.0) module www.freescale.comNote 128K Flash ROM, SCI, SPI, clock generation module, three modules MSCAN12 module MSCAN12 modules MSCAN12 modules MSCAN12 modules www.freescale.comNote Flash memory, enhanced LIN, SPI, clock generation module, Freescale Semiconductor scalable MSCAN08 module www.freescale.comNote Product Highlights Additional Information
MC33897
Note: Search listed part number.
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Design Challenges Different Networks Have Different Performance Needs networks created equal. automotive environment, networks split into distinct categories based nature traffic network. Body control networks, dealing with passenger comfort convenience systems example, deal with wide range message identifiers that appear particular order frequency. contrast, powertrain networks that pass information relating engine transmission control have much lower number different messages deal with, messages appear very rapidly very regularly. These differences messaging result very different approaches designing hardware software systems deal with demands each type network places each node that network. Different Networks Have Physical Layer Requirements CAN, like major networking protocols, requires physical layer device communicate. This physical layer comes
from ISO/OSI seven layer stack model responsible current voltage control bus. deals with current voltage transients signalling (line) faults works possibly correct them. Bosch specification does dictate physical layer specifications anyone implementing network. This both blessing curse designer. Over course last decade, major physical layer designs have come forefront become basic physical layer designs used most applications. They both communicate using differential voltage pair wires commonly referred high-speed low-speed physical layer. lowspeed architecture ability change single-wire operating architecture (referenced ground) when wires faulted through short open. Because nature circuitry required perform this function, this architecture very expensive implement speeds above kbit/s. This kbit/s dividing line between what
considered high-speed low-speed CAN. Although both architectures voltage difference pair wires, termination methods each different incompatible production systems. additional physical layer recently been developed General Motors. This physical layer uses only wire times that limits speed performance 33.33 kbit/s. This singlewire physical layer very different from other types widely accepted. Because there requirements physical layer specification, other standards organizations have developed standards help designers create compatible devices. International Standards Organization (ISO) Society Automotive Engineers (SAE) create standards Europe United States respectively ensure interoperability components physical layer recommended design practices.
Automotive Standards Europe United States
Physical Layer Type Single-wire Low-speed fault-tolerant Standards (Europe) www.iso.org 11519-2 Road Vehicles-Low-Speed Serial Data Communication- Part Low-Speed Controller Area Network (CAN) 11898-3 replaced with 11519-2 High-speed 11898 Road Vehicles-Interchange Digital Information-Controller Area Network (CAN) High-Speed Communication J2284-125, J2284-250, J2284-500 High Speed (HSC) Vehicle Application kbps, kbps, kpbs, respectively Standards (North America) www.sae.org J2411 Single Wire Network Vehicle Applications standard generally used
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Freescale Semiconductor Solution Different Implementations Meet Different Performance Needs Freescale Semiconductor recognizes challenges that face designers automotive devices systems. Because different networks have different messaging needs, Freescale Semiconductor provides different hardware options meet these challenges. Freescale Semiconductor's 32-bit microcontrollers either TouCAN FlexCAN hardware modules communicate bus. These modules based traditional mailbox "full-CAN" hardware architecture that provides message buffers. When messages received, hardware filter match will drop message into `mailboxes' (receive buffers). This approach works very well with powertrain systems, where messages very regular predictable, application designer ensure that software empties mailboxes fast enough keep messages from over-writing messages boxes. boxes emptied fast enough because
multiple messages come quickly with same identifier, data lost. This mailbox architectures always suited networks with unpredictable, event-driven data. stated before, body electronics networks have messaging that very sporadic unpredictable nature, which makes Freescale Semiconductor Scalable (msCAN) architecture well suited these applications. Since HC08, HC12, HCS12 microcontroller families 8-bit 16-bit microcontrollers which backbone body electronics systems components, msCAN module perfect these families. messages received msCAN placed into single first-in, first-out (FIFO) storage structure. This structure maintains order received messages allows many messages with identical identifiers received rapid succession without concern overflow single receive buffer. Freescale Semiconductor SMOS Physical Layer Products Meet Automotive Customer Needs address need multiple types physical layers, Freescale Semiconductor offers range
physical layer devices designed meet exceed performance standards SAE. simple physical layer device always enough. example, automotive modules need from regulated power supply. Sometimes local switch sensor might need wake module from sleep state active running state very quickly. That switch sensor might running vehicle battery levels. This where Freescale Semiconductor System Basis Chip (SBC) brings power value automotive design table. SBCs combine physical layers needed automotive connectivity with voltage regulation, independent watchdog timer, local wake-up circuitry allow greater flexibility with fewer components. Since these circuits made with same semiconductor processes, makes sense combine these functions into package reduce number components needed final design. This reduces assembly costs, increases reliability, increases design flexibility.
Development Tools
Tool Type Software drivers Configuration tool Hardware development tools Product Name MSCAN low-level software drivers MSCAN filter generation tool EVBs other development tools respective MCUs Vendor Metrowerks Metrowerks Metrowerks Description Low-Level Driver Software MSCAN08, MSCAN12, MSCAN HCS12 Calculates Optimal Hardware Filter Settings MSCAN Architecture Customer Application Helps Developers Simplify Speed Development High-Performance Microcontrollers
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Third Party Support
Product Name Vector CANtech CANalyzer CANoe CANape Graph CANscope drivers Freescale Semiconductor MCUs Ford, DaimlerChrysler Volcano Automotive Group Volcano Network Architect VOLCANO Target Package (VTP): Configuration Tool Generator (Vcfg) Target Code Bootloader In-Vehicle Software Download PHYTEC MPC555 (phyCORE) 32-bit power (using PowerPC ISA) with dual full 2.0B TouCAN credit card-sized package. Provides rapid development with MPC555 cost-effective, high-performance, single-board computer. CANopen Slave software network protocol development devices according CANopen standard. CANopen Master software intended development network nodes with master functionality. www.phytec.com Stand-alone offline tool describing configuring VOLCANO networks. Uses network information node-related information configure target code communicate over network. Provides application code with signal API. Bootloader download software over CAN-bus end-of-line programming. www.volcanoautomotive.com Network Analysis Development Tool System Level Message Analysis Modeling Multiple Modules Monitor Calibration Tool Using Digitized Oscilloscope Message Wave Forms Software Drivers www.vector-cantech.com Description Contact Method
CANopen Slave CANopen Master Dearborn Group Technology Dearborn Protocol Adapters (DPA II+, DPAIII): Dearborn Programmable Bridge (DPB) Dearborn Protocol Snooper Falcon Flight Recorder Gryphon Hercules Network Analyzer Software (NAS) Super Analysis Tool (S-CAT)
PC-to-Automotive Communication Networks Gateway Custom software that translates exchanges messages between various protocol networks. Hand-held device monitor messages various protocol networks. Data Capture Manipulation Gryphon Hardware Hardware interface that provides remote connectivity through Ethernet connection. Windows Analyzer Software Gryphon Software Troubleshoot Various Protocol Networks Hardware software that supports advanced communication with in-vehicle networks.
www.dgtech.com
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Related Documentation
Document Number AN1776 AN1798 AN1828 AN2010 AN2011 AN2255 AN2283 EB376 Description Stereo Audio Transmission with TouCAN Timing Requirements Flash Programming Using Freescale Semiconductor MSCAN Filter Configuration Tool MSCAN MCS912DP256 Versus HC12 Family MSCAN Low-Power Applications Freescale Semiconductor Scalable Controller Area Network (MSCAN) Interrupts comparison MC9S12DP256 (mask 0K36N) versus HC12
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Notes
Learn More: Contact Technical Information Center +1-800-521-6247 +1-480-768-2130. more information about Freescale products, please visit www.freescale.com.
Freescaleand Freescale logo trademarks Freescale Semiconductor, Inc. other product service names property their respective owners. Freescale Semiconductor, Inc. 2004. rights reserved. SG2032 12/2004
December2004
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