Patent ID: 8539263
Filing Date: 2013-09-17
Classification: G06F,G06K

Abstract:
1. A method of choosing a functioning mode out of a set of functioning modes of an integrated circuit (IC) device powered by a plurality of different supply voltages from respective supply nodes, the IC device including at least one mode pin for determining a functioning mode of the device, at least one internal control circuit coupled to the supply nodes and to the at least one mode pin for sensing at least one electrical value thereon and to start the IC device in a respective functioning mode depending on the supply node that is powered first, the method comprising: identifying the different supply voltage that first exceeds a threshold voltage, the identified supply voltage being from among the plurality of different supply voltages from the respective supply nodes of the IC device; when the at least one internal control circuit is powered, sensing the at least one electrical value on the at least one mode pin; and powering circuits of the IC device from the different supply voltage that first exceeded the threshold voltage and starting the device in a functioning mode determined by the at least one electrical value and the different supply voltage that first exceeded the voltage threshold.