ADMC328TN AD [Analog Devices], ADMC328TN Datasheet - Page 7

• Manufacturer Part Number: ADMC328TN
• Description: 28-Lead ROM-Based DSP Motor Controller with Current Sense
• Manufacturer: AD [Analog Devices]

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.
OUTPUT REGS
INPUT REGS
GENERATOR
ADDRESS
ALU
DATA
#1
GENERATOR
ADDRESS
DATA
#2
OUTPUT REGS
INPUT REGS
MAC
16
R BUS
SEQUENCER
INSTRUCTION
PROGRAM
REGISTER
Figure 3. DSP Core Block Diagram
OUTPUT REGS
INPUT REGS
EXCHANGE
SHIFTER
BUS
14
16
14
24
–7–
The ADMC328 provides 512
4K
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 I
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.
PM ROM
PM RAM
512
4K
CONTROL
LOGIC
24
24
24-bit program memory ROM and 512
COMPANDING
CIRCUITRY
PMA BUS
DMA BUS
PMD BUS
DMD BUS
DM RAM
512
16
SENSE
TRANSMIT REG
RECEIVE REG
24-bit program memory RAM,
function (combining internal
SERIAL
6
PORT
TIMER
ADMC328
16-bit data