Skip to main content


United States

Archived content

NOTE: this is an archived page and the content is likely to be out of date.

Fujitsu Introduces New 32-bit Microcontrollers with Optimal Features for Highly Efficient Electric and Hybrid Vehicle Motor Control

MB91580 Series with Embedded Resolver Interface Provides Excellent Motor Controllability

Fujitsu Semiconductor America Inc.

Sunnyvale, Calif. , June 29, 2011

Fujitsu Semiconductor America (FSA) today 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."

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

Reference Material

MB91580 series fact sheet: (561 KB)

About Fujitsu Semiconductor America, Inc.

Fujitsu Semiconductor America, Inc. (FSA) is a leading designer and developer of innovative semiconductor products and solutions for new generations of consumer, communications, automotive and industrial products. FSA provides a comprehensive portfolio of high-quality, reliable semiconductor products and services throughout North and South America.

Founded in 1979 and headquartered in Sunnyvale, California, Fujitsu Semiconductor America (formerly Fujitsu Microelectronics America) is a wholly owned subsidiary of Fujitsu Semiconductor Limited (FSL), Japan. FSL offers semiconductor products and services to its customers worldwide through its global sales and development network that includes sites in Japan and throughout Asia, Europe, and the Americas.

For product information, visit the company's website at, e-mail FSA or call 1-800-866-8608.

Press Contact - FMA

Emi Igarashi

Phone: Phone: 408-737-5647
E-mail: E-mail:
Company:Fujitsu Microelectronics America, Inc.

All product names mentioned herein are trademarks or registered trademarks of their respective owners. Information provided in this press release is accurate at time of publication and subject to change without advance notice.

Date: June 29, 2011
City: Sunnyvale, Calif.
Company: Fujitsu Semiconductor America, Inc.