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Fujitsu Semiconductor introduces new 32-bit microcontrollers for electric and hybrid vehicle motor control

Fujitsu Semiconductor America (FSA) introduced a series of new 32-bit microcontrollers (MCUs) that combine performance with a wide range of peripheral functions to enable optimal, high-speed and 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 optimized, real-time controllability for EV and HV motors with fast and efficient loopback operation, and the best torque control possible, Fujitsu says. 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 new MCUs, which are available now, come in 144-pin quad flat packages. Sample pricing starts at $25 each.



Properly programmed, future e-motor controllers will fine tune e-motors output to quickly better match requirements with higher torque and higher efficiency. Drivers will be able to preset (and change at will) the type of e-motor performance they prefer. Future BEVs will be fun to drive.


I suspect high voltage I/O circuit hardware, dedicated ICs and hybrid ICs are more important to accurate, efficient motor control.

We are not modeling the atmosphere here.


Toyota is introducing a comprehensive electronic driver assistance system to greatly reduce driver produced accidents. This may be the next step to further reduce fatal and non-fatal car accidents. It could easily be incorporated into future electrified vehicles.


Even a simple controller module may have short and rigid timing requirements for responses to events, and require a number of calculations to produce the correct response. High memory bus bandwidth and a fast arithmetic engine (32-bit) removes the constraints of the computing platform on the algorithms which can be used.

This stuff is my bread and butter.


Electrified vehicles will open the door to many more electronic technologies to fine tune performance and comfort in the near future.

One new technology, electronically controlled car window variable tint glass will lower A/C requirement up to 30% and greatly extend e-range when driving under hot sun?

Future car windows (roof + booth etc) covered with variable transparency very high efficiency solar cells will not only reduce A/C requirement but will supply more than enough energy for all on-board e-ancillaries and will extend e-range by 50+% on hot sunny days.

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