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