iRMCF371 this document is the property of international rectifier and may not be copied or distribut ed without expressed consent. outline sheet no. 11-03-06 iRMCF371 sensorless motor control ic for appliances features ? mce tm (motion control engine) - hardware based computation engine for high efficiency sinusoidal sensorless control of permanent magnet ac motor ? supports both interior and surface permanent magnet motors ? built-in hardware peripheral for single shunt current feedback reconstruction ? no external current or voltage sensing operational amplifier required ? three/two-phase space vector pwm ? analog output (pwm) ? embedded 8-bit high speed microcontroller (8051) for flexible i/o and man-machine control ? jtag programming port for emulation/debugger ? serial communication interface (uart) ? i 2 c/spi serial interface ? watchdog timer with independent analog clock ? three general purpose timers/counters ? two special timers: periodi c timer, capture timer ? external eeprom and internal ram facilitate debugging and code development ? pin compatible with irmck371, otp-rom version ? 1.8v/3.3v cmos product summary maximum crystal frequency 60 mhz maximum internal clock (sysclk) frequency 128mhz sensorless control computation time 11 sec typ mce tm computation data range 16 bit signed program ram loaded from external eeprom 48k bytes data ram 8k bytes gatekill latency (digital filtered) 2 sec pwm carrier frequency counter 16 bits/ sysclk a/d input channels 4 a/d converter resolution 12 bits a/d converter conversion speed 2 sec 8051 instruction execution speed 2 sysclk analog output (pwm) resolution 8 bits uart baud rate (typ) 57.6k bps number of i/o (max) 13 package (lead-free) qfp48 description iRMCF371 is a high performance ram based motion control ic designed primarily for appliance applications. iRMCF371 is designed to achieve low cost and high per formance control solutions for advanced inverterized appliance motor control. iRMCF371 contains two computation engi nes. one is motion control engine (mce tm ) for sensorless control of permanent magnet motors; the other is an 8-bit hi gh-speed microcontroller (8051). both com putation engines are integrated into one monolithic chip. the mce tm contains a collection of control elements such as proportional plus integral, vector rotator, angle estimator, multiply/divide, low loss svpwm, single shunt ifb. t he user can program a moti on control algorithm by connecting these control elements using a graphic compiler. key components of the sensorless control algor ithms, such as the angle estimator, are provided as comple te pre-defined control blocks implemented in hardware. a unique analog/digital circuit and algorithm to fully support single shunt current reconstruction is also provided. the 8051 microcontroller performs 2-cycle instruction execution (60mi ps at 120mhz). the mce and 8051 microcontroller are connected via dual port ram to process signal monitoring and command input. an advanced graphic compiler for the mce tm is seamlessly integrated into the matlab/simulink environment, while third party jtag based em ulator tools are supported for 8051 developments. iRMCF371 comes with a small qfp48 pin lead-free package.
iRMCF371 this document is the property of international rectifier and may not be copied or distribut ed without expressed consent. 2 1 overview iRMCF371 is a new international rectifier int egrated circuit device primarily designed as a one- chip solution for complete inverter controlled appliance motor control applications. unlike a traditional microcontroller or dsp, the iRMCF371 provides a built-in closed loop sensorless control algorithm using the unique motion control engine (mce tm ) for permanent magnet motors. the mce tm consists of a collection of control elements, motion peripherals, a dedicated motion control sequencer and dual port ram to map internal signal nodes. iRMCF371 also employs a unique single shunt current reconstruction circuit to eliminate additional analog/digital circuitry and enables a direct shunt resistor interface to the ic. motion control programming is achieved using a dedicated graphical compiler integrated into the matlab/simulink tm development environment. sequencing, user interface, host communication, and upper layer control tasks can be implemented in the 8051 high-speed 8-bit microcontroller. the 8051 microcontroller is equipped with a jtag port to facilitate emulation and debugging tools. figure 1 shows a typical application schematic using the iRMCF371. iRMCF371 is intended for development purpose and contains 48k bytes of ram, which can be loaded from external eeprom for 8051 program execution. for high volume production, irmck371 contains otp rom in place of program ram to reduce the cost. both iRMCF371 and irmck371 come in the same 48-pin qfp package with identical pin configuration to facilitate pc board layout and transition to mass production figure 1. typical application block diagram using iRMCF371
iRMCF371 this document is the property of international rectifier and may not be copied or distribut ed without expressed consent. 3 2 iRMCF371 block diagram and main functions iRMCF371 block diagram is shown in figure 2. 8bit up address/data bus motion control bus figure 2. iRMCF371 internal block diagram iRMCF371 contains the following functions for sensorless ac motor control applications: ? motion control engine (mce tm ) o proportional plus integral block o low pass filter o differentiator and lag (high pass filter) o ramp o limit o angle estimate (sensorless control) o inverse clark transformation o vector rotator o bit latch o peak detect
iRMCF371 this document is the property of international rectifier and may not be copied or distribut ed without expressed consent. 4 o transition o multiply-divide (signed and unsigned) o divide (signed and unsigned) o adder o subtractor o comparator o counter o accumulator o switch o shift o atan (arc tangent) o function block (any curve fitting, nonlinear function) o 16-bit wide logic operations (and, or, xor, not, negate) o mce tm program and data memory (6k byte). note 1 o mce tm control sequencer ? 8051 microcontroller o three 16-bit timer/counters o 16-bit periodic timer o 16-bit analog watchdog timer o 16-bit capture timer o up to 13 discrete i/os o four-channel 12-bit a/d ? one buffered channel for current sensing (0 ? 1.2v input) ? three unbuffered channels (0 ? 1.2v input) o jtag port (4 pins) o one channel of analog output (8-bit pwm) o uart o i 2 c/spi port o 48k byte program ram loaded from external eeprom o 2k byte data ram. note 1 note 1: total size of ram is 8k byte including mce program, mce data, and 8051 data. different sizes can be allocated depending on applications.
iRMCF371 this document is the property of international rectifier and may not be copied or distribut ed without expressed consent. 5 3 pinout 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 15 14 16 3 12 4 11 5 6 7 8 9 10 2 1 xtal0 xtal1 p1.1/rxd p1.2/txd vdd1 vss vdd2 p1.3/sync/sck p1.4/cap p2.1 34 35 36 33 46 37 45 38 44 43 42 41 40 39 47 48 vss vdd2 avdd avss ain0 aref p2.6/aopwm pwmuh pwmvh pwmwh pwmul pwmvl pwmwl gatekill vdd1 vss ifbo ifb+ ifb- pllvss pllvdd reset tstmod tck p5.3/tdi p5.2/tdo p5.1/tms sda/cs0 scl/so-si vss (top view) ain2 cmext p2.0/nmi ain1 p3.2/int0 p1.0/t2 p3.0/int2/cs1 13 vdd2 figure 3. iRMCF371 pin configuration
iRMCF371 this document is the property of international rectifier and may not be copied or distribut ed without expressed consent. 6 4 application connections typical application connection is shown in figure 4. all components necessary to implement a complete sensorless drive control algorithm are shown connected to iRMCF371. figure 4. application connection of iRMCF371
iRMCF371 this document is the property of international rectifier and may not be copied or distribut ed without expressed consent. 7 5 package dimensions
iRMCF371 this document is the property of international rectifier and may not be copied or distribut ed without expressed consent. 8 the lqfp-48 is msl3 qualified this product has been designed and qualified for the industrial level qualification standards can be found at www.irf.com ir world headquarters: 233 kansas st., el segundo, california 90245, tel: (310) 252-7105 data and specifications subject to change wi thout notic e. 11/03/2006 www.irf.com
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