San Jose, Calif. - Renesas Technology America, Inc., has launched two new 32-bit MCUs for advanced driver assistance system applications. The'SH74552 and SH74562 are designed for automobile active safety systems. The MCUs feature a compact 13 mm - 13 mm package, 160 MHz high-speed operation, 1 MB of high-speed on-chip flash memory, and on-chip functions such as 4-channel Controller Area Network (CAN).
By integrating in a compact package the capability for high-speed and fine-grained processing of large amounts of data from sensors, they make it possible to build systems that are more compact and lower in cost. In addition, the SH74552 is equipped with a 2-channel FlexRay controller. FlexRay is a communication protocol for next-generation vehicle control applications.
The SH7450 Series MCUs combine on-chip flash memory and high-speed operation. Sample shipments of products with a high operating frequency of 240 MHz have already begun to manufacturers of luxury cars. The new SH74552 and SH74562 for popularly priced cars retain the high performance and special characteristics of the earlier products in the SH7450 Series and provide a carefully selected function set in a package with a mounting area that is 42% smaller.
The SH74552 and SH74562 employ a FBGA package measuring only 13 mm - 13 mm, deliver the high-speed operation and large-capacity memory necessary for high-speed and fine-grained processing of large volumes of data from sensors in applications such as obstacle detection and risk avoidance, and integrate on-chip peripheral functions such as CAN. They are based on Renesas Technology's existing 240 MHz products (17 mm - 17 mm) and provide a carefully selected subset of their specifications. This makes it possible to build advanced driver assistance systems that require less space, are lower in cost, and are more lightweight, making them suitable for popularly priced vehicles.
The new MCUs deliver high-speed operation, with processing performance of 288 MIPS (million instructions per second) at the maximum operating frequency of 160 MHz. This enables them to process large volumes of data from sensors, etc., very rapidly. In addition, since these lower-end MCUs are based on the 240 MHz products that preceded them, existing software resources can be reused, making it possible to quickly develop advanced driver assistance systems for popularly priced vehicles by adapting systems originally intended for luxury cars.
The SH74552 and SH74562 have an ample 1 MB of on-chip flash memory to accommodate the large software programs required by advanced driver assistance systems. Renesas Technology MCUs with on-chip flash memory have a proven track record in a wide range of fields, including automotive, consumer, and industrial equipment, and are highly regarded for their excellent reliability and high-speed operation. The SH74552 and SH74562 also have 256 KB of on-chip SRAM for storing large amounts of data such as milliwave data or image data from cameras.
In an advanced driver assistance system, data detected by a sensor electronic control unit (ECU) linked to milliwave radar, cameras, etc., is transferred via a controller area network (CAN) to a sensor fusion ECU, which uses it to perform control functions. The SH74552 and SH74562 integrate 4-channel CAN functionality to accommodate additional sensor or actuator ECUs for higher-performance advanced driver assistance systems.
The amount of communication data handled is expected to increase rapidly to support coordinated control among vehicle systems, and it is possible that the communication speed of the present CAN specification may prove inadequate. For this reason, the SH74552 is equipped with a 2-channel FlexRay controller, a next-generation backbone network specification providing faster communication speed and enhanced reliability.
In addition to the CPU core, the SH74552 and SH74562 also incorporate a floating-point processing unit (FPU) operating at 160 MHz. The FPU supports both single-precision and double-precision calculations, and in single-precision operations it achieves a maximum performance of 1.12 GFLOPS (giga [billion] floating-point operations per second).
Hardware support for vector operations and arithmetic operations such as sine/cosine operations enables high-speed operation processing. The SH74552 and SH74562 also have a wide operating temperature range ("40 to +125°C) to accommodate the wide temperature range under which advanced driver assistance systems must operate. Finally, they incorporate a careful selection of the on-chip peripheral functions of the first two products in the SH7450 Series.
On-chip functions for controlling vehicle cameras
Camera interface functions required by lane departure warning systems, which detect the white lines on the road surface and issue warnings when the vehicle deviates from the lane, are integrated on-chip. For image data captured by CMOS cameras, the SH74552 and SH74562 incorporate two clock synchronous parallel interface direct RAM inputs (DRIs) that are connected directly to the on-chip SRAM and support a maximum data transfer speed of 40 MB per second.
In addition to a function for reading in an entire image at once, there are built-in functions for selectively reading in only necessary pixels and for reading in images with a reduced pixel count. This allows more efficient utilization of the on-chip RAM and helps boost operation efficiency. A single-channel I2C function required for camera settings is provided.
On-chip functions needed for vehicle milliwave systems
Interface functions required by milliwave radar systems, such as adaptive cruise control systems, that detect obstacles and pedestrians in front of the vehicle, automatically track leading vehicles, and perform emergency braking, etc., are integrated on-chip: parallel DAC controller (PDAC) circuit for D/A converter control; parallel selector (PSEL) circuit for channel control of external high-speed A/D converters (ADCs); DRI circuit ideal for reading in data from external high-speed ADCs; and Timer TOU for controlling a brushless DC motor (BLDC) as part of mechanical milliwave scan control and 62-channel ATU-IIIS (Advanced Timer Unit III) multifunction timer unit ideal for timing control.
On-chip port-to-port communication function for multi-MPU configurations
In response to the constantly rising performance demands on advanced driver assistance systems, the SH74552 and SH74562 incorporate a direct RAM input interface (DRI) and direct RAM output interface (DRO) to minimize performance drag on the MCU's CPU caused by communications functions, and serial communication interfaces (SCIF) with FIFO.
There is also an on-chip direct memory access controller (DMAC) supporting data transfer to external bus areas to enable management of the above communication functions. By combining these functions, it is possible to utilize the maximal performance of the SH-4A CPU and to achieve improved system performance.
The compact package measures 13 mm - 13 mm, and the individual pins are multiplexed for up to six functions to provide support for a wide range of applications. The FBGA package has a 0.8 mm pin pitch and can withstand operating temperatures up to 125°C.
Compilers, the E10A-USB on-chip debugging emulator, flash development toolkits, and starter kits manufactured by Renesas Technology are available for use in system development. A variety of additional development tools are available from third-party vendors.
For more details, visit www.renesas.com.