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PDF ELM312 Data sheet ( Hoja de datos )

Número de pieza ELM312
Descripción STEPPER MOTOR CONTROLLER
Fabricantes ELM Electronics 
Logotipo ELM Electronics Logotipo



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ELM312
Stepper Motor Controller
Description
The ELM312 is an interface circuit for use
between high speed logic and four phase stepper
motor driver circuits. All of the logic required to
provide stepping in two directions is contained in this
one 8 pin package.
This circuit supports only the half-step mode of
operation. This mode provides eight distinct phase
control output signals for driving a variety of motors.
For dual mode operation, the ELM310 should be
considered.
The ELM312 can be controlled by a wide variety
www.DataSheeotf4cUir.ccuoitms, due to its fully static operation. In addition
to using high speed microprocessor control, suitably
debounced mechanical switches or continuously
running oscillator circuits could also be used.
Features
• Low power CMOS design - typically 1mA at 5V
• Wide supply range - 3.0 to 5.5 volt operation
• Two inputs control Half step motion
• No external timing components
• Completely static operation - will maintain a step
position indefinitely
• High current drive outputs - up to 25 mA
• Very high speed - up to 25000 steps per second
Connection Diagram
PDIP and SOIC
(top view)
Applications
• Stepper motor drive logic
• Process sequencing
• Sequential left/right LED driver
VDD 1
A2
Dir 3
Step 4
8 VSS
7B
6C
5D
Block Diagram
20msec
Startup
Timer
Inhibit
Dir 3
Step 4
CW
Step
2A
7B
6C
5D
ELM312DSB
Elm Electronics – Circuits for the Hobbyist
< http://www.elmelectronics.com/ >
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ELM312 pdf
ELM312
Example Application
Figure 3 shows the ELM312 used in a circuit to
control a four phase stepper motor. The motor shown
here is typical of the type often found in computer disk
drives, and are readily available on the surplus market.
This particular motor requires +12V at 160mA per phase
to operate, and has a resolution of 3.6° per step.
Momentary action pushbuttons are used as control
inputs in this case. This allows the user to experiment
with the operation of the motor. An ELM410 is used to
debounce the switches, so that the mechanical
bouncing of the switches does not cause multiple steps
of the motor armature.
Both integrated circuits are powered from a 5 volt
supply, not shown on this diagram. This supply could be
www.DataSheedte4riUve.cdomfrom the 12V for the motor, but is not
necessarily, as the user may want to separate the two
due to noise from the motor.
The motor is directly driven by IRF511 power
MOSFETS in this design, because they were readily
available, but many other devices would be suitable.
The main criteria, as well as voltage and current
capabilities, is that the MOSFET be fully switched by the
logic signal available (in this case 5V). Some of the
‘logic level’ HEXFETs would be well suited in this case
(IRLZ14 or IRL510 for example).
The main advantages of power MOSFETs over
bipolar types are their ability to be driven directly from
CMOS logic, and their inherent reverse biased diode
connected from Drain to Source internally. This diode
helps to control inductive kick-back when a winding is de-
energized. Optional resistors (50-100) are shown in the
circuit to dampen resonances due to wiring inductance
and gate capacitance. They should be used if the
transistors are mounted any more than a few inches from
the ELM312.
Operation of the circuit is straight-forward. The motor
advances one step each time the step button is released.
If the clockwise input is also pressed, the windings will be
energized in the order A-AB-B-BC-C-CD-D-DA. Recall
that when power is first applied, no winding is energized,
to provide a means to sequence the start-up of several
motors in larger systems. For this reason, no output will
appear until the first step command is issued.
This circuit demonstrates the operation of a stepper
motor, and can easily be modified for further
experimentation. One change that could be made is the
addition of an oscillator in the place of the ELM410, to
provide continuous motion. Another might be the direct
connection of the ELM312 to a computer port for
robotics, and the incorporation of sensors for feedback to
the computer.
R
Stepper
Motor
+12V
Bk
*
GW
Clockwise
Step
ELM312DSB
+5V
1
*
8
Br
5 42 7
6 33 6
*
7 24 5
81
+5V
0.1µF
*
* - see text
Figure 3. Manual Control of a Stepper Motor
Elm Electronics – Circuits for the Hobbyist
< http://www.elmelectronics.com/ >
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