MCU adds hardware accelerator to drive two motors

December 08, 2021 // By Nick Flaherty
MCU adds hardware accelerator to drive two motors
The RA6T2 microcontroller family from Renesas is based around a 240MHz ARM Cortex-M33 core and hardware accelerator for inverter appliances, building automation and industrial drives

Renesas Electronics has launched a family of microcontrollers with a hardware accelerator where a single MCU can simultaneously control up to two brushless DC (BLDC) motors.

The RA6T2 Group MCUs add hardware accelerator and peripherals designed specifically for motor control designs in home appliances, smart home, industrial and building automation, as well as inverter control.

The embedded hardware accelerator includes both a Trigonometric Function Unit (TFU) and an Infinite Impulse Response (IIR) filter. The TFU performs high speed calculations without the need for lookup tables, enabling effective use of ROM. The IIR filter offers coefficient setting methods that ease porting from existing algorithms.

The family is based on the 240MHz ARM Cortex-M33 core with 512 KB Flash ROM; 64KB SRAM; 16KB Data Flash and peripherals optimized for high performance and precision motor control in order to reduce bill of materials (BOM) cost while boosting performance.

This includes two independent 12bit ADC units offer high-speed conversion with a maximum speed of 0.16 µsec and include a simultaneous sample and hold function for three channels to detect the three-phase current of a motor.

There are also programmable gain amplifiers that can set the gain according to the input voltage range and analog components that were previously external are incorporated, including comparators which detect abnormal voltage input and over current.

An integrated 10-channel general-purpose timer (GPT), 2-channel asynchronous timer and a watchdog timer sit alongside integrated communications interfaces for CAN FD; 2x I2C; 6x SCI; 2x SPI.

An adjustable PWM timer makes it easy to port existing algorithms and in cooperation with other analog functions, provides a PWM output cutoff safety function in the event of an abnormality. With these features, a single RA6T2 MCU can simultaneously control up to two brushless DC (BLDC) motors.

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“Our motor control customers are looking to differentiate their products in very competitive markets,” said Roger Wendelken, Senior Vice President in the IoT and Infrastructure Business Unit at Renesas. “The RA6T2 Group delivers a unique combination of performance and features that enable cost-effective, powerful designs for a wide variety of applications.”

The devices have an operating voltage of 2.7V to 3.6V and operating temperature range of Ta = -40ºC to 105 ºC. There are five package options: 100-pin LQFP, 64-pin LQFP, 48-pin LQFP, 64-pin QFN, 48-pin QFN.

Renesas has combined the RA6T2 with its new RAA227063 Smart Gate Driver in a reference design for a BLDC Traction Motor Control.

20 new RA6T2 MCUs are available now in five package options. Renesas is also offering design tools, including the RTK0EMA270S00020BJ Motor Control Kit, a CPU board, an Inverter Board, and a Motor Work Bench GUI tool with real-time debugging and digital oscilloscope functionality.

www.renesas.com/RA6T2

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