ELM311
Stepper Motor Controller
Description
The ELM311 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 one mode of operation,
the full-step, or single phase wave mode, as it is
sometimes called. This mode provides sequential
single phase output signals for driving a variety of
motors. For dual mode operation, the ELM310
should be considered.
The ELM311 can be controlled by a wide variety
of circuits, 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 Full 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
V
DD
A
Dir
Step
1
2
3
4
8
7
6
5
V
SS
B
C
D
Block Diagram
20msec
Startup
Timer
2
A
Inhibit
7
B
Dir
3
CW
6
C
Step
4
Step
5
D
ELM311DSB
Elm Electronics – Circuits for the Hobbyist
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