Smart card and method for controlling a mixed mode thereof
AssigneeSamsung Electronics Co., Ltd.
InventorsKi-Yeol Kim, Chan-Yong Kim
Life of this patent
Estimating the term…
Abstract
A mixed mode smart card is disclosed including an internal circuit having a CPU, a contactless mode processor adapted to prosecute a contactless mode operation, and a contact mode processor adapted to prosecute a contact mode operation. The mixed mode smart card also includes a power voltage control block receiving contact and contactless mode power source voltages and supplying the internal circuit with an internal power source voltage derived either during an entire period of mixed mode operation.
Claims20
A mixed mode smart card comprising:
- an internal circuit;
- a contact mode interface adapted to supply a first power source voltage received through a power source terminal;
- a contactless mode interface adapted to supply a second power source voltage through an antenna;
- a power voltage control block adapted to supply an internal power source voltage to the internal circuit derived from a first applied voltage between the first and second power source voltages;
- and
- an interface block adapted to generate a system clock from a contact mode clock supplied through a contact mode clock terminal when the first applied voltage is the first power source voltage, and from a contactless mode clock abstracted from the second power source voltage when the first applied voltage is the second power source voltage.
A method for controlling a smart card adapted for use in mixed modes, the method comprising:
- receiving in the alternative a contact mode power source voltage or a contactless mode power source voltage as a first applied voltage;
- upon receiving the contact mode power source as the first applied voltage, prosecuting a contactless mode operation during a contact mode of operation while maintaining the contact mode power source as the power source for the smart card;
- and,
- upon receiving the contactless mode power source as the first applied voltage, prosecuting a contact mode operation during a contactless mode of operation while maintaining the contactless mode power source as the power source for the smart card.
A mixed mode smart card comprising:
- an internal circuit comprising a central processing unit, a contactless mode processor adapted to prosecute a contactless mode operation, and a contact mode processor adapted to prosecute a contact mode operation;
- and,
- a power, voltage control block adapted to receive a contact mode power source voltage and a contactless mode power source voltage, and further adapted to supply the internal circuit with an internal power source voltage derived from a first applied one of the contact mode power source voltages and the contactless mode power source voltage during an entire period of mixed mode operation characterized by either a contactless mode operation initiated during a contact mode operation following receipt of the contact mode power source voltage as the first applied one, or a contact mode operation initiated during a contactless mode operation following receipt of the contactless mode power source voltage as the first applied one.
Dependencies are inferred from the claim text.