ADMCF327 datasheet(7/36 Pages) AD

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ADMCF327

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GENERAL DESCRIPTION

The ADMCF327 is a low cost, single-chip DSP-based controller,

suitable for permanent magnet synchronous motors, ac induction

motors, and brushless dc motors. The ADMCF327 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.

The DSP core of the ADMCF327 is the ADSP-2171, which is

completely code-compatible with the ADSP-21xx DSP family

and combines three computational units, data address generators

and a program sequencer. The computational units comprise an

ALU, a multiplier/accumulator (MAC) and a barrel shifter.

The ADSP-2171 adds new instructions for bit manipulation,

multiplication (

× squared), biased rounding and global inter-

rupt masking.

The system peripherals are the power-on reset circuit (POR),

the watchdog timer and a synchronous serial port. The serial

port is conﬁgurable, and double buffered, with hardware sup-

port for UART and SCI port emulation.

The ADMCF327 provides 512

× 24-bit program memory RAM,

× 24-bit program memory ROM, 4K × 24-bit program

FLASH memory, and 512

× 16-bit data memory RAM. The

user code will be stored and executed from the flash memory.

The program and data memory RAM can be used for dynamic

data storage or can be loaded through the serial port from an

external device as in other ADMCxxx family parts. The program

memory ROM contains a monitor function as well as useful rou-

tines for erasing, programming, and verifying the flash memory.

The motor control peripherals of the ADMCF327 provide a 12-bit

analog data acquisition system with six analog input channels,

and an internal voltage reference. In addition, a three-phase,

16-bit, center-based PWM generation unit can be used to produce

high accuracy PWM signals with minimal processor overhead.

The ADMCF327 also contains two auxiliary PWM outputs

and nine lines of digital I/O.

Because the ADMCF327 has a limited number of pins, functions

such as the auxiliary PWM and the serial communication port

are multiplexed with the nine programmable input/output (PIO)

pins. The pin functions can be independently selected to allow

maximum flexibility for different applications.

PM ROM

PM RAM

512

BUS

EXCHANGE

COMPANDING

CIRCUITRY

DATA

ADDRESS

GENERATOR

DATA

ADDRESS

GENERATOR

DM RAM

512

R BUS

DMA BUS

PMA BUS

DMD BUS

PMD BUS

INSTRUCTION

INPUT REGS

OUTPUT REGS

SHIFTER

CONTROL

LOGIC

SERIAL

PORT

RECEIVE REG

TRANSMIT REG

TIMER

INPUT REGS

OUTPUT REGS

MAC

INPUT REGS

OUTPUT REGS

ALU

PROGRAM

SEQUENCER

FLASH

PROGRAM

MEMORY

Figure 3. DSP Core Block Diagram

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