Sistemas Embarcados na ind

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Sistemas Embarcados na indústria automotiva

• André Resende

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Microcontroller CPU Trends

• There is also a trend to use high-performance
  RISC CPUs in automotive electronic control
  systems in preference to the traditional Complex
  Instruction Set Computers (CISC) units. This
  trend will continue.
• Traditionally, what has set RISC apart from CISC
  is the ability to execute an instruction in a
  single clock

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Electronic Memory Types

• Automobile manufacturers often wish to revise
  software in the field.
• (EEPROM) memory provides the technology that
  allows such field revisions.
• The next step is expected to be the
  implementation of Magnetoresistive Random Access
  Memory (MRAM)

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Electromagnetic Compatibility

• A system is considered electromagnetically
  compatible if it has satisfied three criteria
• it does not cause interference with other
  systems
• it is not susceptible to emissions from other
  systems and
• it does not generate interference with itself.

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REAL-TIME EMBEDDED NETWORKING IN AUTOMOBILES CAN

• Controller Area Network (CAN) is an ISO standard
  (ISO 11898) and is in widespread use today.
• Many vehicles on sale in Europe today use CAN
  (for example, the Volvo S80, the Saab 9-5, the
  Volkswagen Passat, the Mercedes-Benz S class, the
  Land Rover Freelander).
• CAN is almost certain to succeed in automotive to
  become the de facto standard for in-vehicle
  control. CAN is also widely used in industrial
  control, with several popular higher-level
  protocols (for example, DeviceNet).

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Connectivity

• In the automobile industry, too, common standards
  for connectivity such as Control Area Network
  (CAN) and the local interconnect network (LIN)
  are merging into the mainstream, and OS and
  network-management standards like OSEK are being
  adopted

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CPLDs meet automotive requirements

• Lattice Semiconductor's ispMACH 4000V family of
  CPLDs now supports the full automotive ambient
  temperature range of -40 to 125C . The 3.3V
  ispMACH 4000V family supports a wide range of
  3.3V, 2.5V and 1.8V I/O standards and now
  features 5V tolerant I/Os. The automotive family
  provides four logic density solutions from 32 to
  256 macrocells. The devices support 7.5ns
  pin-to-pin delay and 168MHz operating
  frequencies. Typical standby power consumption
  for the four devices is approximately 40mW.
• The family includes multiple density-I/O
  combinations in thin quad flat pack packages
  ranging from 44 to 176 pins.