Multi-function input terminal of integrated circuits

摘要

A single terminal is used to configure an integrated circuit into one of three states. A circuit within the integrated circuit is coupled to the terminal and determines whether the terminal: 1) is coupled by a low impedance to a voltage source, or 2) is coupled by a medium impedance to the voltage source, or 3) is floating or substantially floating. The circuit asserts a first digital logic signal when the circuit determines that the terminal is coupled by the low impedance to the voltage source. The circuit asserts a second digital logic signal when the circuit determines that the terminal is coupled by the medium impedance to the voltage source. The circuit asserts a third digital logic signal when the circuit determines that the terminal is floating or substantially floating. The terminal and circuit are particular suited for use in a Power Management Unit (PMU) Integrated Circuit.