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Allegro MicroSystems |
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
PARALLEL-TO-SERIAL
DATA CONVERTER
MODE SELECT2 7
MODE SELECT1 6
VECTOR
CONTROL 15
MONITOR 9
5
NOT
USABLE 4
CCW/CW 3
CLOCK IN 2
RESET 1
FUNCTIONAL BLOCK DIAGRAM
MODE SELECTOR
SET
V DD
16
CONTROL
SUPPLY
a
b
c
PHASE
UP-DOWN
COUNTER
8
GROUND
OSC.
10 SERIAL DATAB
11 SERIAL DATAA
12
NO (INTERNAL)
CONNECTION
13 STROBE
14 CLOCK OUT
Dwg. FK-009A
Motor
Excitation
Full Step
Half Step
1/4 Step
1/8 Step
PG001M
Inputs
VC MS1 MS2
HL L
LLL
XHL
XLH
XHH
TRUTH TABLE
SLA7042/44M Output Sequence & PWM Current
01234567
0% 20% 40% 55.5% 71.4% 83% 91% 100%
– – – – – – –s
– – – –s– – –
s– – –s– –s
s –s –s –ss
ssssssss
Motor
Torque
141%
100%
100%
100%
100%
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 1998, Allegro MicroSystems, Inc.
™
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