ELM311
Stepper Motor Controller
Description
Features
The ELM311 is an interface circuit for use
• Low power CMOS design - typically 1mA at 5V
• Wide supply range - 3.0 to 5.5 volt operation
• Two inputs control Full step motion
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.
• No external timing components
• Completely static operation - will maintain a step
position indefinitely
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.
• High current drive outputs - up to 25 mA
• Very high speed - up to 25000 steps per second
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.
Connection Diagram
PDIP and SOIC
(top view)
Applications
1
2
3
4
8
7
6
5
VDD
A
VSS
B
• Stepper motor drive logic
• Process sequencing
Dir
C
• Sequential left/right LED driver
Step
D
Block Diagram
A
B
C
D
2
7
6
5
20msec
Startup
Timer
Inhibit
3
Dir
CW
4
Step
Step
ELM311DSB
Elm Electronics – Circuits for the Hobbyist
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