ELM312 controller equivalent, stepper motor controller.
* 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 c.
* Stepper motor drive logic
* Process sequencing
* Sequential left/right LED driver
VDD 1 A2
Dir 3 Step 4
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