Renesas has released the RA6T2 Group microcontrollers, which feature a rich set of peripheral functions and a hardware accelerator specifically for motor and inverter control.
Based on a 240 MHz Arm® Cortex®-M33 core, the new RA6T2 32-bit MCUs integrate peripherals optimized for precise motor control, helping to reduce bill-of-materials cost while boosting performance. These include two independent ADCs which offer a maximum speed of 0.16 µs. They also include a simultaneous sample-and-hold function for three channels to detect the three-phase current of a motor.
Integrated analog provision includes amplifiers which can set the gain according to the input-voltage range, and comparators which detect abnormal voltage input and over-current. In addition, the adjustable PWM timer makes it easy to port existing algorithms. The RA6T2 MCUs also provide, alongside other analog functions, a PWM output cut-off safety function.
The extensive provision of motor-control peripherals means that a single RA6T2 MCU can simultaneously control two brushless DC (BLDC) motors.
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 look-up tables, enabling effective use of ROM. The IIR filter provides coefficient setting methods which ease porting from existing algorithms.
Renesas also supplies a BLDC traction motor control reference design based on an RA6T2 MCU and including the Renesas RAA227063 smart gate driver for motor-control systems.
Kit Part Number: RTK0EMA270S00020BJ
The MCK-RA6T2 development kit includes a CPU board, an inverter board, and a Motor Work Bench GUI tool with real-time debugging and digital oscilloscope functionality.