IRMCF312

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1 Overview

IRMCF312 is a new International Rectifier integrated circuit device primarily designed as a one-

chip solution for complete inverter controlled appliance dual motor control applications. Unlike a

traditional microcontroller or DSP, the IRMCF312 provides a built-in closed loop sensorless

motion control sequencer and dual port RAM to map internal signal nodes. IRMCF312 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. The sensorless control is the same

for both motors with a single shunt current sensing capability. Motion control programming is

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 IRMCF312.

IRMCF312 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,

IRMCK312 contains OTP ROM in place of program RAM to reduce the cost. Both IRMCF312

and IRMCK312 come in the same 100-pin QFP package with identical pin configuration to

facilitate PC board layout and transition to mass production

Figure 1.

Typical Application Block Diagram Using IRMCF312