Automatic scheme to detect multi-standard charger types

An integrated circuit (IC) device comprising:

• a plurality of multiplexers, wherein a plurality of inputs to each of the plurality of multiplexers are coupled directly to a plurality of reference voltages and to data lines of a USB port that is connectable to a charging device, and wherein the plurality of multiplexers are configured to generate output values based on voltages on the data lines of the USB port and the plurality of reference voltages;
• a comparator coupled to the outputs of the plurality of multiplexers;
• and
• a processing logic coupled to the output of the comparator, wherein based on the output values, the processing logic configured at least to:
• determine whether the charging device conforms to a first charger type, of a plurality of charger types;
• determine whether the charging device conforms to a second charger type, of the plurality of charger types, when the processing logic determines that the charging device does not conform to the first charger type, wherein the second charger type is different from the first charger type;
• and
• determine that the charging device conforms to a third charger type, of the plurality of charger types, when the processing logic determines that the charging device does not conform to the first charger type or the second charger type, wherein the third charger type is different from the first charger type and the second charger type.

A system comprising:

• a charging device;
• and
• a portable device coupled to the charging device over a USB connection, the portable device comprising:
• a plurality of multiplexers, wherein a plurality of inputs to each of the plurality of multiplexers are coupled directly to a plurality of reference voltages and to data lines of the USB connection,
• wherein the portable device is configured to generate output values via the plurality of multiplexers based on voltages on data lines of the USB connection and a plurality of reference voltages;
• determine whether the charging device conforms to a first charger type, of a plurality of charger types, based on the output values based on the voltages on the data lines of the USB connection and the plurality of reference voltages;
• determine whether the charging device conforms to a second charger type, of the plurality of charger types, based on the output values based on the voltages on the data lines of the USB connection and the plurality of reference voltages, when the portable device determines that the charging device does not conform to the first charger type, wherein the second charger type is different from the first charger type;
• and
• determine that the charging device conforms to a third charger type, of the plurality of charger types, based on the output values based on the voltages on the data lines of the USB connection and the plurality of reference voltages, when the portable device determines that the charging device does not conform to the first charger type or the second charger type, wherein the third charger type is different from the first charger type and the second charger type,
• wherein the first charger type is BC compliant, the second charger type conforms to a first charging specification that defines BC non-compliant charging current or voltage, and the third charger type conforms to a second charging specification that defines BC non-compliant charging current or voltage.