32-Bit Microcontrollers Add Digital Power Control

Renesas-ADusseldorf, Germany: Expanding the company’s RX600 microcontroller (MCU) family, the 32-bit RX62G microcontrollers (MCUs) from Renesas are optimised for digital power control applications, including motor control with power factor correction (PFC), digital power supply, uninterrupted power supplies (UPSs), and solar inverters (see the figure).

The 32-bit RX62G MCUs from Renesas are optimised for digital power control applications, including motor control with PFC, digital power supply, UPSs, and solar inverters.

Digital power control applications require a balance of high performance and high resolution while meeting stringent power consumption and cost criteria. Previously, engineers have used dedicated DSPs or application-specific devices that hit the power/performance balance but can be more complex and expensive to design in.

Renesas says that by enabling complex algorithms and high-precision control at an affordable cost, the RX62G series enables higher efficiency in these types of power control applications.

The new MCUs expand on the analog and control features of the RX62T and RX63T devices. They’re also pin-compatible with the RX62T series and software-compatible with other members of the RX600 family.

Furthermore, the MCUs operate at 100 MHz, delivering constant 1.65 DMIPS/MHz to provide power efficiency when operated at lower speeds. Their integrated DSP instruction and floating-point unit (FPU) enable efficient implementation of complex algorithms and control loops.

The single-precision FPU offloads the RX CPU and simplifies decimal-point calculations, boosting overall processing performance and simplifying firmware development, claims the company.

With an embedded flash that works at CPU speed with no wait state, the RX62G delivers a real-time performance 165 DMIPS at 100 MHz in a pure deterministic manner.

The MCUs’ four high-resolution timers can generate pulse-width modulation (PWM) signals with 312.5-ps resolution needed to control power bridges to deliver maximum efficiency and lower power losses.

Similar to the RX62T MCUs, the RX62G devices feature two 12-bit analog-to-digital converter (ADC) units and one 10-bit ADC unit that can capture analog input values from up to 20 channels at a 1-µs minimum conversion time. Each ADC can be triggered by timer units and sample three phases in parallel.

The RX62G MCUs also integrate a new 16-bit general-purpose PWM timer (GPT) and MTU3 multifunction timer-pulse units specialized for motor control. With this combination, one RX62G MCU can control up to a trio of three-phase motors simultaneously.

Samples of the RX62GMCU are available now. The RX62G MCU will be available in two memory configurations (256-kbyte flash/16-kbyte SRAM/32-kbyte data flash and 128-kbyte flash/8-kbyte SRAM/8-kbyte data flash) and two package variations (LQFP100 14x14 and LQFP112 20x20). The RX62G MCU is also available with or without CAN channels.


TAGS: Digital ICs
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