GENERAL DESCRIPTION

The ADMCF326 is a low cost, single-chip DSP-based controller, suitable for permanent magnet synchronous motors, ac induction motors, and brushless dc motors. The ADMCF326 integrates a 20 MIPS, fixed-point DSP core with a complete set of motor control and system peripherals that permits fast, efficient devel opment of motor controllers.

FEATURES

20 MIPS Fixed-Point DSP Core

  Single Cycle Instruction Execution (50 ns)

  ADSP-21xx Family Code Compatible

  Independent Computational Units

    ALU

    Multiplier/Accumulator

    Barrel Shifter

  Multifunction Instructions

  Single Cycle Context Switch

  Powerful Program Sequencer

    Zero Overhead Looping

    Conditional Instruction Execution

  Two Independent Data Address Generators

Memory Configuration

  512
24-Bit Program Memory RAM

  512
16-Bit Data Memory RAM

  4K
24-Bit Program Memory ROM

  4K
24-Bit Program Flash Memory

    Three Independent Programmable Sectors

    Security Lock Bit

    10K Erase/Program Cycles

Three-Phase 16-Bit PWM Generator

  16-Bit Center-Based PWM Generator

  Programmable Dead Time and Narrow Pulse Deletion

  Edge Resolution to 50 ns

  150 Hz Minimum Switching Frequency

  Double/Single Duty Cycle Update Mode Control

  Programmable PWM Pulsewidth

  Special Crossover Function for Brushless DC Motors

  Individual Enable and Disable for Each PWM Output

  High Frequency Chopping Mode for Transformer

    Coupled Gate Drives

  External PWMTRIP Pin

Integrated ADC Subsystem

  Six Analog Inputs

  Acquisition Synchronized to PWM Switching Frequency

  Internal Voltage Reference

9-Pin Digital I/O Port

  Bit Configurable as Input or Output

  Change of State Interrupt Support

Two 8-Bit Auxiliary PWM Timers

  Synthesized Analog Output

  Programmable Frequency

  0% to 100% Duty Cycle

  Two Programmable Operational Modes

    Independent Mode/Offset Mode

16-Bit Watchdog Timer

Programmable 16-Bit Internal Timer with Prescaler

Double Buffered Synchronous Serial Port

Hardware Support for UART Emulation

Integrated Power-On Reset Function Options

28-Lead SOIC and PDIP Packages Available

TARGET APPLICATIONS

Washing Machines, Refrigerator Compressors, Fans, Pumps, Industrial Variable Speed Drives



MOTOR TYPES

AC Induction Motors

Permanent Magnet Synchronous Motors (PMSM)

Brushless DC Motors (BDCM)