New 32-bit Motor Control Microcontroller for Electric (EV) and Hybrid Electric Vehicles (HEV) by Fujitsu Semiconductor

Fujitsu Semiconductor America (FSA) has introduced a series of new 32-bit microcontrollers (MCUs) that combine excellent performance with a wide range of peripheral functions to enable optimal, high-speed and highly efficient 3-phase inverter motor control in electric (EV) and hybrid vehicles (HV).


The new MB91580 series is part of the FR family of 32-bit RISC architecture microcontrollers, which incorporate embedded Flash memory and feature optimized, high-performance peripherals for EV and HV 3-phase inverter motor control. Applications include EV/HV motor and electric generator control, as well as generic, high-performance, electric motor control.


Highly efficient loopback control is achieved by using a high-speed, dedicated 12-bit A/D converter and Resolver-to-Digital Converter (RDC). Dedicated hardware generates the required motor control parameters (such as the electrical angle’s sine and cosine values) to accurately detect motor current and position at high speeds, enabling precise motor control waveform generation. The FR81S CPU uses the latest and most advanced FR core to deliver 160DMIPS high-performance calculating power. An IEEE-754-compliant Floating Point Unit enables the MCU to process vector conversion and PID control calculations rapidly, using data from the 12-bit A/D converter and RDC.


The resulting solution delivers highly optimized, real-time controllability for EV and HV motors with fast and efficient loopback operation, and the best torque control possible. This level of integration and performance enables system designers to reduce overall motor and motor-control unit costs significantly.


The three members in the series are the MB91F585 (with 576 KB Flash and 48 KB RAM); the MB91F586 (with 832 KB Flash and 64 KB RAM); and the MB91F587 (with 1088 KB Flash and 96 KB RAM).

“The MB91580 series is an ideal design choice for electric and hybrid vehicles because it is designed specifically to support motor control requirements,” said Akio Nezu, senior manager for marketing, Fujitsu Semiconductor America. “These microcontrollers use a dedicated embedded resolver sensor interface to control the three-phase inverter, resulting in optimal motor controllability. This enables the system designer to achieve higher performance while lowering the system cost.”



  • Generic electric motor control
  • HEV/EV inverter
  • HEV/EV generator control


Key Features

Main processor

  • FR81S core
  • Single precision FPU
  • 128MHz CPU frequency
  • 8ch DMA


Motor control features

  • Integrated RDC
  • RDC excitation signal waveform generation
  • 12ch motor timing waveform generator
  • Quadrature encoder



  • 3ch CAN / 64Msg buffers
  • 5ch multifunctional serial (LIN, SPI, I2C, UART)
  • FlexRayTM interface (A+B)


Functional safety features

  • MPU
  • ECC for all memory types
  • Watchdog
  • Low voltage detector for internal/external power supply
  • Clock supervisor
  • CPU diagnostic
  • Bus diagnostic
  • RAM diagnostic
  • NMI
  • 16/32-bit CRC generator


The new MCUs, which are available now, come in 144-pin quad flat packages. Sample pricing starts at $25 each. More information is available at


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