Toshiba has developed the DSP "TMP77FM70TUG" which can control the motors used for high-precision compressors (electric power steering and automotive air conditioners), and has been supplying samples since March 5, 2007. From the perspective of the electronic control system for EPS, it has been the mainstream of the system control and motor control using one microcontroller. The products developed by Toshiba are different, and the design that separates the system control function from the motor control function is adopted, and parallel processing is realized. In this way, the operating frequency can be reduced to reduce power consumption, the performance can be improved by the separation function, and the model can be easily expanded. "It is a new solution that can achieve efficient control and flexibility" (Toshiba) . In order to achieve high-speed processing, the new product is equipped with a 16-bit DSP core developed by Toshiba. The core uses a Harvard Architecture ( circuit structure with independent program memory and data memory area) that can simultaneously refer to instructions and data. . Moreover, the motor current waveforms of the two systems can be simultaneously converted by two AD converters every 2 μs. In addition, the 3-phase PWM circuit for motor drive can also output at a minimum resolution of 25 ns. With this function, the input precision of an external signal from the motor can be improved, and the resolution of the output signal can be finely set, so that the motor can be controlled with higher precision. In this way, the steering force of the electric power steering wheel can be improved, the vibration of the automobile air conditioner compressor can be reduced, and the performance of the vehicle motor application can be improved.
Automobile manufacturers are currently striving to improve fuel efficiency. The trend of using electric power steering wheels is accelerating. The electric power steering wheel is different from the original hydraulic power steering wheel. It does not need to be driven by a hydraulic pump, but is driven by a motor when necessary. In order to improve fuel efficiency. In addition, in automotive air conditioning compressors, more and more manufacturers are beginning to adopt vector control, the most efficient driving method. Therefore, the demand for processors capable of both 3-phase PWM output and high-speed operation and AD conversion is expanding, and users hope to develop systems that control more efficient and finer. To meet this demand, Toshiba has developed a product that separates system control functions from motor control functions based on a 16-bit DSP core with high-speed product-sum operation.
The "TMP77FM70TUG", which has begun to supply samples, is equipped with a flash ROM. The sample price is 1,500 yen. Toshiba plans to mass-produce the "TMP77CM70TUG" equipped with a mask ROM from a monthly capacity of 100,000 units starting in December 2007.
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