Patent ID: 8358100

Claim:
A USB (Universal Serial Bus) dedicated charger identification circuit comprising: a USB D+ port; a USB D− port; a first circuit conforming to a first identification protocol, said first circuit including a first voltage divider and a second voltage divider coupled in parallel to said first voltage divider; a second circuit conforming to a second identification protocol, wherein said second circuit is a conductor; logic selectively coupling one of said first circuit and said second circuit to said USB D+ port and said USB D− port; wherein said logic couples said first circuit to said USB D+ port and said USB D− port as a default condition; wherein said logic includes an electronic switch having at least two poles with at least two throws per pole that couples said first circuit and said second circuit to said USB D+ port and said USB D− port; and wherein said logic further comprises circuitry having an input coupled to at least one of said USB D+ port and said USB D− port and an output coupled to a control input of said electronic switch.