admcf340 Analog Devices, Inc., admcf340 Datasheet - Page 8

• Manufacturer Part Number: admcf340
• Description: Dashdsptm 64-lead Flash Mixed-signal Dsp With Enhanced Analog Front End
• Manufacturer: Analog Devices, Inc.

ADMCF340
(continued from page 1)
GENERAL DESCRIPTION
The ADMCF340 is a low cost, single-chip DSP-based controller
suitable for permanent magnet synchronous, ac induction, switched
reluctance, and brushless dc motors. The ADMCF340 integrates
a 20 MHz, fixed-point DSP core with a complete set of motor control
and system peripherals that permit fast, efficient development of
motor controllers.
The DSP core of the ADMCF340 is completely code compatible
with the ADSP-21xx DSP family and combines three computa-
Integrated 13-Channel ADC Subsystem
Three Bipolar I
Three Simultaneous Converting Voltage Inputs
Seven Muxed Auxiliary Analog Inputs
Internal Voltage Reference (2.5 V)
Acquisition Synchronized to PWM Switching
25-Pin Digital I/O Port
Bit Configurable as Input or Output
Change of State Interrupt Support
Two 16-Bit Auxiliary PWM Timers
Synthesized Analog Output
Programmable Frequency
0% to 100% Duty Cycle
Two Programmable Operation Modes
Independent Mode/Offset Mode
External PWMTRIP Pin
Switched Reluctance Motor Mode Selection Pin
PWM Polarity Selection Pin
Sample and Hold Amplifier and Overcurrent
Protection (Usable as Three Dedicated Analog Inputs)
Frequency
OUTPUT REGS
INPUT REGS
GENERATOR
ADDRESS
DATA
ALU
SENSE
#1
Inputs with Programmable
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
14
24
16
–8–
tional units, data address generators, and a program sequencer.
The computational units comprise an ALU, a multiplier/accumu-
lator (MAC), and a barrel shifter. There are special instructions
for bit manipulation, multiplication (x squared), biased rounding,
and global interrupt masking. The system peripherals are the
power-on reset circuit (POR), the watchdog timer, and two
synchronous serial ports. The serial ports are configurable,
and double buffered, with hardware support for UART, SCI,
and SPI port emulation. The ADMCF340 provides 512 × 24-bit
program memory RAM, 4K × 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 ADMCxx family
parts. The program memory ROM contains a monitor function
as well as useful routines for erasing, programming, and verifying
the flash memory.
The motor control peripherals of the ADMCF340 provide a 12-bit
analog data acquisition system with 13 analog input channels,
three dedicated I
cation, 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
ADMCF340 also contains two 16-bit auxiliary PWM timers
and 25 lines of programmable digital I/O.
Several functions such as the auxiliary PWM and the serial com-
munication ports are multiplexed with the nine PORT A (9, PIO)
programmable input/output (PIO) pins. The other 16 pro-
grammable digital I/O are dedicated. The pin functions can
be independently selected to allow maximum flexibility for
different applications.
512
PM ROM
PM RAM
4K
CONTROL
LOGIC
24
24
COMPANDING
CIRCUITRY
PMA BUS
DMA BUS
PMD BUS
DMD BUS
SENSE
PROGRAM
MEMORY
4K
FLASH
functions (combining internal amplifi-
24
TRANSMIT REG
RECEIVE REG
SERIAL
6
PORT
TIMER
DM RAM
512
16
REV. 0