San Jose, Calif. - Two new 32-bit microcontrollers (MCUs) from Renesas Technology America, Inc., the SH74504 and SH74513, implement the "preventative safety" features of new cars and trucks.
The new 240MHz devices use the SH-4A CPU and are fabricated with 90-nm process technology. Incorporating up to 2Mbytes of flash, plus 512Kbytes of SRAM and a total of 64Kbytes of cache, they deliver substantially better performance than comparable earlier-generation products, according to the company.
The SH74504 and SH74513 operate over a temperature range of -40°C to +125°C and have a compact 17mm - 17mm, 292-pin BGA package. Both devices have a 5-channel CAN function to accommodate the larger number of sensor and actuator electronic control units (ECUs) in today's high-performance driver-assist systems. A distinguishing feature of the SH74504 is the addition of a higher-bandwidth 2-channel FlexRay function.
The new MCUs are designed to deliver the increased speed, features, and computing capabilities essential for safety systems that help drivers avoid potential accidents.
The devices' SH-4A CPU has been used in MPUs for car navigation systems. This 32-bit superscalar RISC-type CPU is designed to smoothly process the large volumes of sensor data that characterize obstacle-detection and danger-avoidance functions.
Examples of such "proactive" in-vehicle features include lane-departure warning systems, adaptive cruise control functions and blind-spot monitors. These and similar options are migrating down from premium automobiles to become persuasive selling points for buyers of mainstream vehicles.
When operating at 240MHz, the MCUs achieve performance levels of 432 MIPS (432 million instructions per second) and 1.68 GFLOPS (1.68 billion floating point operations per second) while consuming only 1.5 watts of power. The high-speed calculating capabilities of the built-in hardware floating point unit (FPU) accelerate vector and sine/cosine arithmetic computations.
Thus, the devices can process data quickly to deliver rapid situation updates in fast-changing real-world driving situations. Large on-chip flash memory (2Mbytes for the SH74504, 1.5Mbytes for the SH74513) is included to store the complex code typical of image-recognition and threat-analysis programs.
The 512Kbyte on-chip SRAM allows the chips to handle large amounts of data, and their 64Kbyte cache (32Kbytes for instructions, 32Kbytes for data) enables the SH-4A CPU core to achieve the best possible throughput.
The SH74504 and SH74513 integrate the following on-chip peripheral functions specifically required by many driver-assist systems including onboard camera control and port-to-port communications.
To accelerate system development with the SH74504 and SH74513 MCUs, Renesas offers a comprehensive set of hardware and software tools, including compilers, the High-performance Embedded Workshop (HEW) integrated development environment, the E10A-USB on-chip debugging emulator, flash development tools, and starter kits. A global support community of third-party vendors offers a variety of other hardware/software development products and services.
To learn more go to www.renesas.com.