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ADMC328YN Folha de dados(PDF) 7 Page - Analog Devices

Nome de Peças ADMC328YN
Descrição Electrónicos  28-Lead ROM-Based DSP Motor Controller with Current Sense
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ADMC328
–7–
REV. B
GENERAL DESCRIPTION
The ADMC328 is a low cost, single-chip DSP-based controller,
suitable for permanent magnet synchronous motors and brushless
dc motors. The ADMC328 integrates a 20 MIPS, fixed-point
DSP core with a complete set of motor control and system
peripherals that permits fast, efficient development of motor
controllers.
The DSP core of the ADMC328 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, multipli-
cation (
× squared), biased rounding and global interrupt 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 support
for UART and SCI port emulation.
The ADMC328 provides 512
× 24-bit program memory RAM,
4K
× 24-bit program memory ROM and 512 × 16-bit data
memory RAM. The program memory ROM contains the user-
specified program code and is defined using a single metal layer
mask. The program and data memory RAM can be used for
dynamic data storage.
The motor control peripherals of the ADMC328 comprise a
12-bit analog data acquisition system with five analog input
channels and one dedicated ISENSE function (combining internal
amplification, sampling, and overcurrent PWM shutdown
features) 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 ADMC328 also contains two auxiliary PWM
outputs, and nine lines of digital I/O.
Because the ADMC328 has a limited number of pins, a number
of functions such as the auxiliary PWM and the serial commu-
nication 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.
BUS
EXCHANGE
COMPANDING
CIRCUITRY
DATA
ADDRESS
GENERATOR
#2
DATA
ADDRESS
GENERATOR
#1
14
14
24
16
6
R BUS
16
DMA BUS
PMA BUS
DMD BUS
PMD BUS
INSTRUCTION
REGISTER
INPUT REGS
OUTPUT REGS
SHIFTER
CONTROL
LOGIC
DM RAM
512
16
PM ROM
4K
24
PM RAM
512
24
SERIAL
PORT
RECEIVE REG
TRANSMIT REG
TIMER
INPUT REGS
OUTPUT REGS
MAC
INPUT REGS
OUTPUT REGS
ALU
PROGRAM
SEQUENCER
Figure 3. DSP Core Block Diagram


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