a
Motion Coprocessor
ADMC201
FEATURES
FUNCTIONAL BLOCK DIAGRAM
Analog Input Block
D0–D11
RESET
WR
A0–3
RD
DATABUS
11-Bit Resolution Analog-to-Digital (A/D) Converter
7 Single-Ended (SE) Analog Inputs
4 Simultaneously Sampled Analog Inputs
Expansion with 4 Multiplexed Inputs
3.2 s Conversion Time/Channel
0 V–5 V Analog Input Range
EMBEDDED
CONTROL
CONTROL BUS
SEQUENCER
CS
IRQ
CLK
CONTROL
REGISTERS
INTERNAL
REFERENCE
REFOUT
Internal 2.5 V Reference
PWM Synchronized Sampling Capability
12-Bit PWM Timer Block
Three-Phase Center-Based PWM
1.5 kHz–25 kHz PWM Switching Frequency Range
Programmable Deadtime
REFIN
CONVST
11-BIT
A/D
CONVERTER
U
V
W
VECTOR
TRANSFORMATION
BLOCK
AUX
Programmable Pulse Deletion
PWM Synchronized Output
External PWM Shutdown
AUX0
AUX1
AUX2
AUX3
MULTIPLEXER
EXPANSION
BLOCK
Vector Transformation Block
12-Bit Vector Transformations
Forward and Reverse Clarke Transformations
Forward and Reverse Park Rotations
2.9 s Transformation Time
PROG.
DIGITAL
I/O
PWMSYNC
A
AP
B
BP
C
PIO 0–5
PORT
12-BIT
PWM TIMER
BLOCK
CP
Programmable Digital I/O Port
6-Bit Configurable Digital I/O
Change of State Interrupt Support
DSP & Microcontroller Interface
12 Bit Memory Mapped Registers
Twos Complement Data Format
6.25 MHz to 25 MHz Operating Clock Range
68-Pin PLCC Package
STOP
Flexible Analog Channel Sequencing
The ADMC201 supports acquisition of 2, 3, or 4 channels per
group. Converted channel results are stored in registers and
the data can be read in any order. The sampling and conversion
time for two channels is 8 µs, three channels is 11.2 µs, and four
channels is 14.4 µs (using a 12.5 MHz system clock).
Single 5 V DC Power Supply
Industrial Temperature Range
Embedded Control Sequencer
The embedded control sequencer off-loads the DSP or micro-
processor, reducing the instructions required to read analog
input channels, control PWM timers and perform vector trans-
formations. This frees the host processor for performing control
algorithms.
GENERAL DESCRIPTION
The ADMC201 is a motion coprocessor that can be used with
either microcontrollers or digital signal processors (DSP). It
provides the functionality that is required to implement a digital
control system. In a typical application, the DSP or micro-
controller performs the control algorithms (position, speed,
torque and flux loops) and the ADMC201 provides the neces-
sary motor control functions: analog current data acquisition,
vector transformation, digital inputs/outputs, and PWM drive
signals.
Fast DSP/Microprocessor Interface
The high speed digital interface allows direct connection to 16-bit
digital signal processors and microprocessors. The ADMC201
has 12 bit memory mapped registers with twos complement
data format and can be mapped directly into the data memory
map of a DSP. This allows for a single instruction read and write
interface.
PRODUCT HIGHLIGHTS
Simultaneous Sampling of Four Inputs
Integration
A four channel sample and hold amplifier allows three-phase
motor currents to be sampled simultaneously, reducing errors
from phase coherency. Sample and hold acquisition time is
1.6 µs and conversion time per channel is 3.2 µs (using a 12.5 MHz
system clock).
The ADMC201 integrates a four channel simultaneous sampling
analog-to-digital converter, four channel analog multiplexer,
analog reference, vector transformation, six digital inputs/outputs,
and three-phase PWM timers into a 68-pin PLCC. Integration
reduces cost, board space, power consumption, and design and
test time.
REV. B
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
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© Analog Devices, Inc., 2000