Patent ID: 7607585
Filing Date: 2009-10-27
Classification: G06K,H04L

Abstract:
1. An integrated circuit device having an ISO communication mode and a non-ISO communication mode, the integrated circuit device comprising: a plurality of data lines comprising a first data line and a second data line; a transceiver circuit coupled to the plurality of data lines; and a means for determining whether or not the integrated circuit device is electrically connected to an external device in response to a voltage level signal on at least one data line at a power-up state; wherein the integrated circuit device is set to any one of the ISO communication mode and the non-ISO communication mode within a predetermined time according to the voltage level and the integrated circuit device causes the external device not to recognize a connection state of the integrated circuit device for the predetermined time, and after the predetermined time, the integrated circuit device causes the external device to recognize the connection state; wherein the voltage control circuit controls a voltage of the second data line to be equal to that of the first data line for the predetermined time, the voltage of the second data line being determined by the external device after the predetermined time.