CIRCUIT FOR SWITCHING REFERENCE VOLTAGE OF COMPARATOR

摘要

PURPOSE: A circuit for switching reference voltage of a comparator is provided to prevent unnecessary current consumption of a comparator by cutting off reference voltage of the comparator in a comparison process. CONSTITUTION: A reference voltage pad(200) generates a reference voltage. A comparator(500) has an input tab connected with a pad(100). A switch circuit(300) connects the reference voltage input tab of the comparator(500) with the reference voltage pad(200). A control circuit(400) operates the switch circuit(300). The switch circuit(300) includes a unit which connects/separates the reference voltage input tab of the comparator(500) with/from the reference voltage pad(200), and a switch which connects the reference voltage input tab of the comparator(500) with the ground.