A/D converter with comparators and low-power detection mode for resistive matrix keyboards

摘要: An apparatus and method is disclosed for providing a fast, low power consumption, detection of at least one depressed key in resistive matrix keyboard. The common contact each row connected to first input plurality analog/digital comparators capable switching between high voltage states. A predetermined reference applied second comparator using digital analog converter. output state if the level higher than voltage, lower voltage. varied identify which has experienced change state.