ELM312

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


Application

• Stepper motor drive logic
• Process sequencing
• Sequential left/right LED driver


Specifications

Storage Temperature....................... -65°C to +150°C
Ambient Temperature with
Power Applied....................................-40°C to +85°C
Voltage on VDD with respect to VSS............ 0 to +7.5V
Voltage on any other pin with
respect to VSS........................... -0.6V to (VDD + 0.6V)

Note:
Stresses beyond those listed here will likely damage the device. These values are given as a design guideline only. The ability to operate to these levels is neither inferred nor recommended.


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 ELM312 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 nconsidered.

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.