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MCUs geared for industrial, smart metering apps

Posted: 13 Mar 2013 ?? ?Print Version ?Bookmark and Share

Keywords:smart metering? MCU? embedded RAM?

Renesas Electronics Corp. has extended its 32bit RX microcontroller (MCU) line with the introduction of 120 models for the RX631 and RX63N product groups within its RX600 series. The products deliver up to 256KB embedded RAM, doubling today's available RAM size of 128KB, indicated the company.

According to the company, the products are pin-to-pin compatible with existing models, and therefore recommended as a drop-in replacement for customers with larger RAM requirements. By providing larger RAM, the devices allow developing complex applications that combine several middleware components such as TCP-IP stacks and networking services, SSL and encryption, graphic libraries and USB functions. Typically, RX631/63N models with 256KB SRAM will be products of choice for developer wanting to take full advantage of "the power of two" promotion that enable them to use any middleware component from Micrium when they choose RX for their design.

Based on Renesas' 90nm process technology, the RX63N/RX631 groups achieve 165DMIPS (Dhrystone MIPS) at 100MHz CPU and flash operation. The products offer a wide and scalable product extension from 1-2MB flash integration by supporting 256KB RAM for all of these product variations. In addition, all these products integrate 32KB of E2 data flash memory that supports 100,000 rewrite cycles for easy data storage. The devices are housed in an LQFP package, allowing Renesas to provide products geared for embedded equipment supporting 100-176 pins.

As an additional feature, the RX63N/RX631 models integrate an optional data encryption unit (DEU) that enables customers to use encryption/decryption functions according to the AES standard. The encryption engine supports AES (128, 192 and 256bit key length).

The MCUs share several features with the existing RX63N/RX631 groups, including up to three channels of Controller Area Network (CAN) 2.0B compliant interfaces, two USB full speed hosts, USB OTG and device features and an Ethernet MAC IEEE 802.3 interface, compliant with Media Independent Interface (MII) and Reduced Media Independent Interface (RMII), for easy connection to a PHY (RX63N only). The RX63N/RX631 groups of MCUs (excluding the 64- and 48-pin packages) also include an EXDMAC unit that can transfer data over an external bus independently of the internal bus occupation. This allows these MCUs to easily support TFT solutions for up to QVGA or WQVGA class TFT panels, even if there is no dedicated LCD controller used in the application.

These devices also include a real-time clock (RTC) that reduces power consumption by offering 2V real-time clock operations. The RTC module includes an anti-tamper detection function that independently detects system state changes with three pins while the CPU is in the power off state and not operating. It also assigns timestamps.

The RX63N/RX631 devices with 256KB RAM will be available by December 2013 in mass production, with pricing ranging from $6.35 for 1MB Flash-192KB SRAM in LQFP 100-pin package without CAN in 10K-unit quantities to $9.50 for 2MB Flash-256KB SRAM in LQFP 176-pin package with CAN in 10K-unit quantities.

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