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
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
鈥?Low power CMOS design - typically 1mA at 5V
鈥?Wide supply range - 3.0 to 5.5 volt operation
鈥?Two inputs control Half step motion
鈥?No external timing components
鈥?Completely static operation - will maintain a step
position indefinitely
鈥?High current drive outputs - up to 25 mA
鈥?Very high speed - up to 25000 steps per second
Connection Diagram
PDIP and SOIC
(top view)
Applications
鈥?Stepper motor drive logic
鈥?Process sequencing
鈥?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
ELM312DSB
Elm Electronics 鈥?Circuits for the Hobbyist
< http://www.elmelectronics.com/ >
1 of 5
1
2
3
4
5
