Renesas Electronics announced the development of the RX231 Group of 32-bit microcontrollers (MCUs), which offers an optimal combination of power-efficient MCU technology, the high-performance RXv2 CPU core, powerful DSP/FPU operation capabilities and low power consumption. The RX231 Group is ideal for applications that require high processing performance in environments with low current supply capacity, such as industrial sensors, healthcare devices, and wearable devices, and building automation devices such as thermostats.
The RXv2 CPU core achieves a performance benchmark score of 4.16 CoreMark/MHz, 35-percent higher than the RX200 Series with the earlier RXv1 core. With operating speeds of 54 MHz, and approximate increases of 2X-4X in DSP performance and 6X in FPU performance, the new MCUs significantly reduce the time required for high-processing load tasks such as digital filtering.
The RX231 Group only takes 0.8 µA in standby mode, while retaining the contents of both SRAM and CPU registers, and consuming only 120 µA/Hz when the CPU is active with peripherals off. The RX231 Group can recover from standby mode in a minimum of 5 µs, which makes it possible to reduce current loss during the recovery and allow the application to react quickly to external events. Applications can be executed from flash after this time, and analog functions, such as the analog-to-digital converter, are available for use.
The RX231 Group also supports an additional low power timer (LPT), which consumes only an additional 0.4 µA and allows the user to program the device to wake up from the low power modes with a very wide range of possible timings, minimizing current consumption in many different applications.
With support for up to 24 touch keys for self-capacitance mode and up to 144 keys for mutual capacitance mode, the RX231 MCUs can support LED, buzzer, and communication functions in more basic touch systems. This touch key functionality combines high sensitivity with a high level of noise tolerance, allowing use even when the panel is wet or when the operator is wearing gloves.
The RX231 Group fully supports IoT platforms by providing enhanced communication functionality with complete USB 2.0 support, including device/host and OTG operation and full compliance to Battery Charging specification 2.0. The RX231 devices also feature several connectivity peripherals, including up to 7 SCI channels, SDHI support, a CAN interface with ISO 11898-1 compliance, and an IrDA interface for wireless connectivity and audio support.
The RX231 MCUs offer extensive hardware-based safety features for UL and IEC60730, including self-diagnostic and disconnect-detection monitoring for the on-chip A/D converter; a clock frequency accuracy measurement circuit; an independent watchdog timer, and a built-in hardware memory test to spot anomalies in the internal RAM. For enhanced security, the RX231 provides AES encryption, a hardware-based Random Number Generator (RNG) and Unique Device ID that can be configured to support advanced cryptology requirements.
Source: Renesas Electronics