Electronic digital logic circuitry – Interface – Current driving
Reexamination Certificate
2007-08-01
2010-06-22
Barnie, Rexford N (Department: 2819)
Electronic digital logic circuitry
Interface
Current driving
C326S057000, C326S030000
Reexamination Certificate
active
07741870
ABSTRACT:
A single terminal is usable 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 tied low by an external connection, or 2) is tied high by an external connection, or 3) is floating or is substantially floating. If the circuit determines that the terminal is floating or is substantially floating, then the circuit sets an operational characteristic of a portion of the circuit (for example, sets a maximum current with which the circuit charges a battery) to have a value that is a function of a resistance of an external resistor coupled to the terminal. If no external resistor is present, then the terminal is floating and the operational characteristic is set to have a zero value. The terminal and circuit are particularly suited to use in a USB battery charger.
REFERENCES:
patent: 7038502 (2006-05-01), Yamaguchi
Gray Richard L.
Hurtz Gary M.
Kunst David J.
Active-Semi, Inc.
Barnie Rexford N
Imperium Patent Works
Tran Thienvu V
Wallace Darien K.
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