STMicroelectronics: Low Cost Microcontrollers for 3-Phase Induction Motors.SAINT GENIS, France--(BUSINESS WIRE)--June 3, 1999-- STMicroelectronics (NYSE NYSE See: New York Stock Exchange :STM (Scanning Tunneling Microscope) A microscope that can image down to the atomic level. An STM uses a piezoelectric tube with a tiny sharp tip at the end that is moved within nanometers of the object being sampled. ) has expanded its portfolio of microcontrollers optimized for motor control applications with the introduction of the ST92141, a high performance 8/16-bit microcontroller designed to simplify the control of 3-phase induction motors. Electronically controlled 3-phase induction motors are being increasingly used in air conditioners, industrial applications and washing machines and other home appliances because of their high reliability, low acoustic noise, variable speed capability and very high efficiency. The ST92141 is particularly suited to these applications, thanks to a dedicated Induction Motor Control (IMC (Internet Mail Consortium, Santa Cruz, CA, www.imc.org) An industry trade association founded in 1996 by Paul Hoffman and Dave Crocker that promotes Internet e-mail standards and features. ) peripheral cell that minimizes both software complexity and processor overhead. The 25MHz operating frequency of the IMC cell allows switching frequencies above the audible frequency range, while the dedicated tacho-generator input and six PWM outputs (high and low side outputs for each of the three phases) greatly reduce the external interface components required. The sinewaves generated by ST92141 to drive the motor windings have 1024 levels of resolution, which improves overall efficiency by significantly reducing current ripple and harmonic losses. In addition, the dead-time for driving the power stage is programmable up to 5.2us, with a resolution of 80ns. The ST92141's powerful motor control peripheral allows the major control tasks to be handled automatically, freeing the microcontroller to implement standard PID (1) (Process IDentifier) A temporary number assigned by the operating system to a process or service. (2) (Proportional-Integral-Derivative) The most common control methodology in process control. regulation or fuzzy logic algorithms for variable speed regulation and other control tasks. Like other ST9 microcontrollers, the ST92141 is based on a proven 8/16-bit core with a register-based architecture that is particularly suited to real-time control applications. The 256-byte register file includes 224 general purpose registers that can be freely used as accumulators, address pointers or registers. With a 25MHz internal clock frequency, the core processor can execute 8-bit instructions in just 160ns and 16-bit instructions in 240ns, while the large register file supports the use of multiple workspaces, with rapid context switching to optimize real-time performance. The ST92141 is offered in EPROM EPROM in full erasable programmable read-only memory Form of computer memory that does not lose its content when the power supply is cut off and that can be erased and reused. , OTP and ROM versions, in SDIP See Shrink DIP and Skinny DIP. 32 and SO34 packages, with up to 16K of ROM and 512 bytes of RAM. The ST92141 also includes an SPI serial interface for high speed communication with other control units. An 8-bit A/D converter and an additional independent 16-bit timer makes it possible to handle further control functions such as temperature or pressure regulation with external sensors. The ST92141 has been designed to provide robust performance in cost-sensitive, electrically noisy applications; enhanced noise immunity is supported by features such as a hardware Watchdog Timer, a Low Voltage Detection circuit, a special asynchronous Refers to events that are not synchronized, or coordinated, in time. The following are considered asynchronous operations. The interval between transmitting A and B is not the same as between B and C. The ability to initiate a transmission at either end. Emergency pin that puts all motor driver output pins in high impedance, and high hysteresis hysteresis (hĭs'tərē`sĭs), phenomenon in which the response of a physical system to an external influence depends not only on the present magnitude of that influence but also on the previous history of the system. inputs. A PLL allows internal 25MHz operation using an external low cost crystal of 3 to 5MHz, thus reducing EMI. The device is supported by a complete set of development tools, including real time emulator, C-compiler, programming boards, demo boards and application notes. STMicroelectronics (formerly SGS-THOMSON Microelectronics) is a global independent semiconductor company, whose shares are traded on the New York Stock Exchange New York Stock Exchange (NYSE) World's largest marketplace for securities. The exchange began as an informal meeting of 24 men in 1792 on what is now Wall Street in New York City. , on the Bourse de Paris and on the Milan Stock Exchange Milan Stock Exchange The largest regional stock exchange in Italy, facilitating more than 90% of the country's trading volume. . The Company designs, develops, manufactures and markets a broad range of semiconductor integrated circuits (ICs) and discrete devices used in a wide variety of microelectronics applications, including telecommunications systems, computer systems, consumer products, automotive products and industrial automation and control systems. Further information on ST can be found at www.st.com. |
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