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PG001M Schematic ( PDF Datasheet ) - Allegro MicroSystems

Teilenummer PG001M
Beschreibung PARALLEL-TO-SERIAL DATA CONVERTER
Hersteller Allegro MicroSystems
Logo Allegro MicroSystems Logo 




Gesamt 12 Seiten
PG001M Datasheet, Funktion
RESET 1
CLOCK IN 2
CCW/CW 3
NOT USABLE 4
NOT USABLE 5
MODE
SELECT. .1
MODE
SELECT. 2.
6
7
GROUND 8
PG001M
V DD 16
15
CONTROL
SUPPLY
VECTOR
CONTROL
14 CLOCK OUT
13 STROBE
12 NO
CONNECT.
11 SERIAL
DATA A
10 SERIAL
DATA B
9 MONITOR
Dwg. PK-009
PARALLEL-TO-SERIAL
DATA CONVERTER
The PG001M CMOS IC converts parallel-data signals from a low-
cost, 8-bit microprocessor or microcontroller into a serial-data format
compatible with the SLA7042M and SLA7044M power multi-chip
modules to drive unipolar PWM, high-current stepper motors. The
converter provides for five basic modes of operation:
1) normal, two-phase, full step (100% torque vector),
2) two-phase 'boosted' torque (141% torque vector),
3) half-step, constant torque operation (using a 2-1-2 output switching),
4) quarter-stepping utilizing ratioed currents for constant torque, and
5) microstepping (1/8th steps) for quiet, smooth, resonance-free motor
performance.
The PG001M is supplied in a low-cost 16-pin dual in-line plastic
package. It is rated for continuous operation over the temperature
range of -20°C to +85°C.
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, VDD .................... 7.0 V
Input Voltage Range,
VI ................ -0.5 V to VDD + 0.5 V
Input Current, II ....................... ±10 mA
Output Voltage Range,
VO ............... -0.5 V to VDD + 0.5 V
Output Current, IO ................... ±15 mA
Operating Temperature Range,
TA .......................... -20°C to +85°C
Storage Temperature Range,
TS ........................ -40°C to +150°C
CAUTION: CMOS devices have input static
protection but are susceptible to damage if
exposed to extremely high static electrical
charges.
FEATURES
s Intended For Use With SLA7042M or SLA7044M
Microstepping, Unipolar PWM, High-Current Motor Drivers
s Supports Five Stepper-Motor Operating Modes
s µP-Compatible Inputs
Always order by complete part number, PG001M .






PG001M Datasheet, Funktion
PG001M
PARALLEL-TO-SERIAL
DATA CONVERTER
CLOCKOUT, SERIAL DATAA, SERIAL DATAB, and
STROBE. In the full-step modes the clock, data, and
strobe pulses are 1/8 the input clock rate; while half-step
operation produces 'bursts' at 1/4 the input clock rate.
Further, quarter-step mode signals correspond to 1/2 the
input clock frequency; while during microstepping the
signal 'bursts' equal the input clock rate. Hence, the step
rate is always 1/8th the input clock frequency, regardless of
the operating mode. Obviously, the clock rate increases
while accelerating, becomes constant during slewing, and
decreases as the step motor and load are decelerating.
Microstepping Operation
Figures 1 and 2 illustrate the incremental eight step
divisions provided while microstepping. The 3-bit se-
quence from 0 through 8 provides smooth, constant-torque
operation that is delivered to the motor/load by the
SLA7042M or SLA7044M power multi-chip modules.
The circle in figure 1 and the arc in figure 2 represent
the constant-torque vectors. Slight discrepancies are
evident when examining the vector 'arrows'. The disparity
is insignificant, and will not affect smooth, resonance-free
motion. However, it may affect realizing accurate and
precise intermediate positioning. Subdividing steps into
A
100
91
83
MAXIMUM FULL-STEP
71.4
55.5
5/8 STEP
40
3/4 STEP
20 7/8 STEP
FULL STEP
BB
20 40 55.5 71.4 83 91 100
A CURRENT IN PER CENT
Dwg. GK-020
Figure 2 — Current/Displacement Vectors
eight distinct, exact positions is often very challenging.
Clearly, variation in the phase currents affects rotor
displacement, and is a very crucial factor in resolving
accurate, intermediate step divisions.
Another critical factor to realizing precise, repeatable
step subdivisions pertains to the selection and evaluation
of the step motor. The better motors exhibit uniformly
spaced positioning characteristics. However, torque vs
displacement characteristics vary (often greatly). Usually,
precise step subdivisions require motors designed for
microstepping.
An 'Integrated' Microstepping Design
The combination of CMOS controller IC and
microstepping power module is depicted in figure 3. The
µP provides the needed logic signals that reset the counter,
control rotor direction, determine the operating mode, and
change the current/torque vector (during full-step, 2-phase
operation).
The sequencing logic provides a 'readback' signal (the
MO output) that switches LOW at the half-step position
when the microcontroller can shift control modes and not
incur oscillation/vibration problems. The mode change is
allowed at the 45° vector, half-step position shown in
figure 2. In addition to the 45° AB vector, three other half-
step vectors occur during stepping: AB at 135°, AB at
225°, and AB at 315° (figure 1). These current vectors
correspond to the half-step positions in four quadrants, and
four 2-phase, full steps of rotation.
The Parallel-to-Serial Conversion
Perhaps the greatest system advantage for designers is
the simplification of software. Controlling and operating
the SLA7042/44M power multi-chip modules directly
would require programming the system µP to provide and
update serial data to both the A and B inputs, and signals
to the clock and strobe inputs that control the A and B
sections of the driver.
Although designs utilizing the CMOS control IC
require seven I/O lines, the software program will be
simpler and shorter. The system µP provides logic signals
that control RESET, CCW/CW (direction), MODE
SELECT1, MODE SELECT2, VECTOR CONTROL, and
read the MONITOR return. Only the CLOCK input is a
'dynamic', constantly switching signal from the system
control I/O.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000

6 Page









PG001M pdf, datenblatt
PG001M
PARALLEL-TO-SERIAL
DATA CONVERTER
The products described here are manufactured in Japan by Sanken Electric Co.,
Ltd. for sale by Allegro MicroSystems, Inc.
Sanken Electric Co., Ltd. and Allegro MicroSystems, Inc. reserve the right to
make, from time to time, such departures from the detail specifications as may be
required to permit improvements in the design of their products.
The information included herein is believed to be accurate and reliable.
However, Sanken Electric Co., Ltd. and Allegro MicroSystems, Inc. assume no
responsibility for its use; nor for any infringements of patents or other rights of third
parties which may result from its use.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000

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