MCU provides motor control for home appliances.

Press Release Summary:

Suited for appliances such as refrigerators, washers, and dryers, 80 MHz, 32-bit MCU Model MB91F487 provides 2 multi-function timer units for motor inverter control on single IC. Incorporating 3 A/D converters with total of 18 channels, MCU senses minute changes in up to 18 sensors. Unit includes 512 Kb Flash ROM and 32 Kb RAM and operates from 4-5.5 V.

Original Press Release:

Fujitsu Expands 32-Bit Microcontroller Family Designed for High-Performance Home Appliances

New MB91F487 Provides Inverter Control for Two Motors

SAN JOSE, Calif., March 27 / -- Fujitsu Microelectronics America, Inc. (FMA) today introduced the newest addition to its MB91480 series of 32-bit microcontrollers (MCUs) for high-performance control of home appliances like refrigerators, washers and dryers.

The 80MHz, 32-bit MB91F487 provides two multi-function timer units for motor inverter control on a single IC, saving space and increasing functionality. It is the newest member of the FR family of 32-bit MCUs, which meets the requirements of new generations of appliances by collecting and using information from multiple sensors.

"The MB91480 series of FR MCUs is ideal for appliances that use motor control, like washing machines. High-speed A/D converters and dedicated motor- control wave-form generator functions meet the demand for quieter and smoother operation of the motors in these products," said Akio Nezu, senior manager of the Embedded Solutions Business Group, Fujitsu Microelectronics America. "These controllers, including the new MB91F487, also meet the requirements of microwave ovens, which have several temperature monitors and steam-cooking capabilities, as well as of air-conditioners, which are being designed with air-purification and humidifier functions."

The new MCU incorporates three A/D converters with a total of 18 channels, which allow for sensing minute changes in up to 18 sensors. Together with the pulse-width-modulation controller, the converters enable smooth and detailed control. Also, for inverter control computation, special product-sum operation circuits divide high-speed processing with the CPU and reduce the burden on the CPU.

Pricing and Availability

The MB91F487, which includes 512Kbytes of Flash ROM and 32Kbytes RAM, operates at voltages from 4V to 5.5V. The MCU comes in 100-pin LQFP packages, and samples are available now at $13.00 each. Volume pricing starts at $9.20 each in 10,000-unit quantities.

About Fujitsu Microelectronics America, Inc.

Fujitsu Microelectronics America, Inc. (FMA) leads the industry in innovation. FMA provides high-quality, reliable semiconductor products and services for the networking, communications, automotive, security and other markets throughout North and South America. For more information about GDCs, MCUs, and FlexRay products please see or address e-mail to

MB91F487 Main Product Specifications

Product Name MB91F487

Minimum Instruction 12.5 ns (80MHz)
Execution Time

Memory ROM 512 Kilobyte
(Flash memory)
RAM 32 Kilobyte

Communication Functions I2C function UART 3 channel (ch)

Analog Functions 8/10-bit 4ch X 2 units
A/D 10ch X 1 units

Timer Functions Multi-function timer 2 units
16-bit reload timer 2ch
8/16-bit PPG timer 8 bit X 16ch(16 bit X 8ch)
16/32-bit base timer 16 bit X 4ch
(32 bit 2ch)
Watchdog timer 1ch

External Interrupt Maximum 11

DMAC 5ch

Product-sum Operation 1 Unit
Circuits (32 bit X 32 bit + 72 bit
= 72bit operation
For operation results,
possible to extract
rounding to 32-bit)

I/O Ports Maximum 77

Supply Voltage 4.0~5.5 V

Operating Temperatures -40~+85 degrees Celsius

Package LQFP(*3) -100 pin (0.5mm
pitch, 14mm x 14mm)
Source: Fujitsu Microelectronics America, Inc.

CONTACT: Emi Igarashi of Fujitsu Microelectronics America, Inc.,

Web site:

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