Description

Many modern control circuits use the value from a digital counter to directly determine a setting or position. Manipulating this value under computer control is not difficult, but when one has to interface with a human operator, several other factors must be considered. Human interfaces often require that the circuit respond to changes in a setting – up or down, left or right, clockwise or counterclockwise. These controls need a simple interface, which the ELM415 provides.

Features

? Low power CMOS design – typically 1mA at 5V

? Wide supply range – 3.0 to 5.5 volt operation

? Fully debounced switch inputs

? Internal pullup resistors provided

? Protection from simultaneous key presses

? High current drive outputs – up to 25 mA

? User selectable automatic repeat function

? Selectable Count output polarity

Applications

? Digital audio potentiometer controls

? Variable voltage or temperature circuits

? Motor positioning controls

? Single-stepping control circuits

? Reset circuits