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ELM312 Datasheet Preview

ELM312 Datasheet

STEPPER MOTOR CONTROLLER

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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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ELM Electronics

ELM312 Datasheet Preview

ELM312 Datasheet

STEPPER MOTOR CONTROLLER

No Preview Available !

ELM312
Pin Descriptions
VDD (pin 1)
This pin is the positive supply pin, and should
always be the most positive point in the circuit.
Internal circuitry connected to this pin is used to
provide power on reset of the microprocessor, so
an external reset signal is not required. Refer to
the Electrical Characteristics section for further
information.
A (pin 2)
This is the active high output drive signal for the
(first) phase A winding. Normally, this output
www.DataSheet4wUou.cldombe the first to be energized when starting a
stepping sequence, and is always the first state
entered into internally on powerup. After powerup,
however, the ELM312 treats this pin specially,
maintaining it at a low level until the first step
command is received. This in effect keeps the
motor off until selected by control circuitry.
Dir (pin 3)
This pin determines the sequence that the outputs
will be energized in. A high input on the Dir pin
while the step input is pulsed will cause a single
clockwise step, while a low level will cause a
counter-clockwise step. (Refer to Figures 1 & 2).
Dir must be at a stable level prior to the low to
high transition of Step in order to be recognized
(refer to the Tsu specification).
Step (pin 4)
This input is used to control the motion of the
motor. Outputs will change to their next state on
the high to low transition of this input. Step is
normally maintained at a low level, and is only
brought high then low to cause a step to occur.
The Step input is ignored for about 20ms after
power-up to allow sufficient time for external
circuits to stabilize.
D (pin 5)
This is the active high output drive signal for the
(fourth) phase D winding.
C (pin 6)
This is the active high output drive signal for the
(third) phase C winding.
B (pin 7)
This is the active high output drive signal for the
(second) phase B winding.
VSS (pin 8)
Circuit common is connected to this pin. This is
the most negative point in the circuit.
Ordering Information
These integrated circuits are available in either the 300 mil plastic DIP format, or in the 200 mil SOIC surface
mount type of package. To order, add the appropriate suffix to the part number:
300 mil Plastic DIP............................... ELM312P
200 mil SOIC..................................... ELM312SM
All rights reserved. Copyright ©1999 Elm Electronics.
Every effort is made to verify the accuracy of information provided in this document, but no representation or warranty can be
given and no liability assumed by Elm Electronics with respect to the accuracy and/or use of any products or information
described in this document. Elm Electronics will not be responsible for any patent infringements arising from the use of these
products or information, and does not authorize or warrant the use of any Elm Electronics product in life support devices and/or
systems. Elm Electronics reserves the right to make changes to the device(s) described in this document in order to improve
reliability, function, or design.
ELM312DSB
Elm Electronics – Circuits for the Hobbyist
< http://www.elmelectronics.com/ >
2 of 5


Part Number ELM312
Description STEPPER MOTOR CONTROLLER
Maker ELM Electronics
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ELM312 Datasheet PDF






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