Sistemas Embarcados na indústria automotiva

André Resende

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

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)

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.

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).

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

CPLDs meet automotive requirements

• Lattice Semiconductor's ispMACH 4000V family of CPLDs now supports the full automotive ambient temperature range of -40 to 125°C . 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.