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Renesas unveils car MCU with MONOS embedded flash

Posted: 24 Oct 2006 ?? ?Print Version ?Bookmark and Share

Keywords:Renesas? SH7147F? RISC? MONOS? MCU?

Renesas Technology America Inc. has unveiled its first MCU built with the company's metal oxide nitride oxide silicon (MONOS) embedded flash technology. The SH7147F 64-MHz, 32bit RISC MCU is designed for controlling electric motors in automotive chassis, safety and hybrid electric systems.

The SuperH-family device's MONOS-based 256Kbyte on-chip flash memory is implemented by a 0.15?m process and has a full-time single-cycle random access capability. It requires almost 60 percent less chip area than the same amount of flash built with floating-gate NOR flash technology, according to the company. The MONOS embedded flash is also said to be more reliable because its cell design minimizes losses.

Precise control
The set of peripheral functions built into the SH7147 MCU for automotive applications allow for precise control of 3-phase motors and include eight channels of 16bit PWM timers and a 16-channel ADC with sample-and-hold (S/H) circuits. These and other on-chip functions, combined with the MCU's high computing performance, allow cost-effective precision inverter designs for electrical power-steering and various DC/DC voltage conversion applications in hybrid electric and gas powered cars and trucks, said the company.

The SH7147F is a second-generation product that provides functional and performance improvements over the 50MHz SH7047F, while using the same small 100-pin package and maintaining software compatibility for a shorter development time. In addition to a 28 percent faster CPU speed, the SH7147F offers a more sophisticated data converter. The enhanced A/D offers higher resolution (12bits, up from 10), additional channels capable of simultaneous sampling and conversion (six, up from two), and a quicker conversion time (about 30 percent faster). It also achieves approximately a two-fold improvement in absolute precision, for more accurate inverter control.

The ADC interacts with the on-chip 16bit PWM timers to implement precise inverter control. Those timers include the Motor Management Timer (MMT) and Multifunction Timer pulse Unit (MTU). The latter consists of the MTU2 and MTU2S, which have higher operating speeds of 32MHz and 64MHz, respectively. The timers are easier to use thanks to new features such as an ADC start-request delayed function and an interrupt-request thinning-out function.

Easy connections
The SH7147F also incorporates communication functions for easy connections to other electronic units, subsystems and ICs. A CAN interface is compatible with the CAN in-vehicle LAN specification. A 4-wire Synchronous Serial communication Unit (SSU) channel allows the selection of master mode or slave mode and can perform synchronous serial communication even with a device that uses a different clock polarity and different clock phase. Three on-chip SCI channels can handle both asynchronous and synchronous serial communication.

The MCU has an 8bit data-bus-width external expansion function and a Data Transfer Controller (DTC) that allows data transfers to internal and external memory without CPU intervention. The ambient operating temperature range is -40C to 125C. System development tools are available including an integrated development environment with C/C++ compiler package, simulator/debugger, project management tools, and a flash memory programming tool, as well as an emulator (the E200F).

Sample pricing for the SH7147F (R5F71474) with 256Kbytes flash memory and 12Kbytes RAM capacity is $25.75.

- Gina Roos

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