Multi-Mode Integrated Circuit Devices Including Mode Detection and Methods of Operating the Same

A multi-mode integrated circuit device, comprising:

• a controller configured to operate in a first mode compliant with the International Standard Organization (ISO) specification ISO 7816 and a second mode different from ISO 7816 responsive to a mode selection signal;
• a first plurality of input/output pads associated with operations in the first mode;
• a second plurality of input/output pads associated with operations in the second mode;
• and
• a mode detector circuit coupled to at least one of the second plurality of input/output pads and configured to detect connection of the at least one of the second plurality of input/output pads to an external device and to activate the mode selection signal to select the second mode responsive to detection of connection of the at least one of the second plurality of input/output pads to the external device, wherein the mode detector circuit comprises:
• a reference current generator circuit coupled to the at least one of the second plurality of input/output pads;
• and
• a connection detect circuit coupled to the reference current generator circuit and to the at least one of the second plurality of input/output pads that activates the mode selection signal responsive to a detection output signal from the reference current generator circuit and to a signal on the at least one of the second plurality of input/output pads.

A multi-mode integrated circuit device, comprising:

• a controller configured to operate in a first mode compliant with the International Standard Organization (ISO) specification ISO 7816 protocol and a second mode different from ISO 7816 responsive to a mode selection signal;
• a first plurality of input/output pads associated with operations in the first mode;
• a second plurality of input/output pads associated with operations in the second mode, the second plurality of input/output pads including a first voltage input/output pad, a second voltage input/output pad and a data input/output pad configured for a cable connection to communicate with an external device;
• and
• a mode detector circuit coupled to at least one of the second plurality of input/output pads and configured to detect a resistance level of the external device when it is connected to the at least one of the second plurality of input/output pads and to activate the mode selection signal to select the second mode responsive to detection of a resistance level of the external device between a first predetermined level and second predetermined level.

A multi-mode integrated circuit device, comprising:

• a controller configured to operate in a first mode compliant with the International Standard Organization (ISO) specification ISO 7816 protocol and a second mode different from ISO 7816 responsive to a mode selection signal and to generate a mode detection sample signal;
• a first plurality of input/output pads associated with operations in the first mode;
• a second plurality of input/output pads associated with operations in the second mode;
• and
• a mode detector circuit coupled to at least one of the first plurality or the second plurality of input/output pads and configured to detect connection of the at least one of the first plurality of input/output pads or the at least one of the second plurality of input/output connectors to an external device at a plurality of sequential times spaced at an interval defined by the mode detection sample signal and to drive the mode selection signal to select the first mode or the second mode responsive to detection of connection of the at least one of the first plurality of input/output pads or the at least one of the second plurality of input/output pads to the external device at the plurality of sequential times.