Automotive radar solution bolsters ADAS and autonomous driving vehicles

Supplier of advanced semiconductor solutions Renesas Electronics has unveiled its first RH850-based, 32-bit, automotive radar microcontroller (MCU) series,

The RH850/V1R series is aimed at delivering the high performance and features required for enabling future advanced driver assistance systems (ADAS) and autonomous driving vehicles. The RH850/V1R-M, the first product from the series, includes a digital signal processor (DSP), high-speed serial interfaces and is designed for middle- to long-range radars.

 Software and tools including evaluation boards will also become available to enable the system developers to start their development immediately with the RH850/V1R-M solution.

Designed for radar applications in ADAS, the RH850/V1R-M MCU includes optimised, programmable digital signal processing, a dual core at 320 megahertz (MHz) with industry-leading high speed flash of 2 megabyte (MB) and a 2 MB internal RAM.

The RH850/V1R-M MCU is designed to have optimised hardware acceleration in the DSP. The optimised DSP allows the system developers to process the raw data into target objects efficiently, separately from the safety relevant classification and tracking done in the CPUs. Renesas’ DSP performs radar specific algorithms such as fast fourier transforms (FFTs), beamforming, windowing, channel calibration, peak search, at high speed and with low power consumption.

The DSP offers high flexible programmability and the company has developed a DSP math library for automotive radar sensors to support system developers in their algorithm development.

Developed using Renesas’ 40-nanometer (nm) embedded flash (eFlash) process technology, the embedded flash offers system designers higher integration using less PCB space and better real time behaviour. The RH850/V1R-M also has low power consumption as the transistors are smaller and lower parasitic capacitances. The process specification of this  also fulfills the highest temperature requirements (T-junction 150°C).

 The RH850/V1R-M features two G3MH CPU cores operating at 320 megahertz (MHz) and these are the highest performance cores among the RH850 family. The G3MH is a superscalar reduced instruction set computer (RISC) architecture with two 7-stage integer pipelines, which allows execution of two different instructions at the same time. Each G3MH core achieves the performance of 3.2 DMIPS/MHz.

 Including 2MB industry-highest speed flash based on 40nm embedded flash technology and a large 2MB capacity RAM, the RH850/V1R-M handles all specific calculations on radar cube data such as range and velocity FFTs, digital beam forming, constant false alarm rate and peak detection.

With the expansion of ADAS and autonomous driving, sensors are fast becoming a key technology. Currently vehicles are being equipped with a broad spectrum of sensors such as cameras, lidar and ultrasonic sensors. In particular, radar sensors are required for ADAS applications, including advanced emergency braking and adaptive cruise control, because unlike other sensors, radar sensors are not negatively affected by external environmental limitations which includes adverse weather conditions, such as rain, fog or whether the sun is shining or not.

Additionally, high precision sensing becomes critical in realising future autonomous driving to meet the increasing requirements of range resolution, separation of objects and precision in measurement of velocity. This requires increased numbers of antennas and boosting of the signal processing performance.


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