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)