Patent ID: 7286435
Filing Date: 2007-10-23
Classification: G06F,G06K,G11C,Y02D

Abstract:
1. A card device having a normal operation state and a low consumed power state as an operation state and serving to carry out a transition from the normal operation state to the low consumed power state if a command is not input for a certain period, comprising a regulator, a first internal circuit and a second internal circuit, wherein the regulator supplies, to the second internal circuit, an internal voltage generated by dropping an external voltage when the external voltage is high, and exactly supplies the external voltage as an internal voltage to the second internal circuit when the external voltage is low, the external voltage is supplied as an operating power source to the first internal circuit and the supply of the external voltage to be the operating power source is continuously carried out also after the transition to the low consumed power state, and when the operation state of the card device carries out the transition to the low consumed power state, an operation of the regulator is stopped and the supply of the internal voltage to be supplied to the second internal circuit by the regulator is suppressed.