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ELM312

ELM Electronics
Part Number ELM312
Manufacturer ELM Electronics
Description Stepper Motor Controller
Published Aug 1, 2008
Detailed Description ELM312 Stepper Motor Controller Description The ELM312 is an interface circuit for use between high speed logic and fou...
Datasheet PDF File ELM312 PDF File

ELM312
ELM312

Overview
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 • 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/ > 1 of 5 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 would be the first to be energized when starting a stepping sequence, and is always the first state enter...


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