Patent ID: 11954548
Assignee: STMICROELECTRONICS (ROUSSET) SAS
Field: Computer technology (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 0:
1. A device, comprising:
a first node configured to receive a power supply voltage;
a second node configured to receive a reference voltage;
a first connector configured to receive a smart card, the first connector comprising:
a first electric contact connected to the first node and configured to come into contact with a first electric contact area of the smart card which is intended to receive the power supply voltage;
a second electric contact connected to the second node and configured to come into contact with a second electric contact area of the smart card which is intended to receive the reference voltage; and
a third electric contact configured to come into contact with a third electric contact area of the smart card which is a three-state output;

a first light-emitting diode having an anode coupled to the third electric contact and a cathode coupled to the second node; and
a second light-emitting diode having a cathode coupled to the third electric contact and an anode coupled to the first node;
wherein the first light-emitting diode is on and the second light-emitting diode is off when the three-state output is at the power supply voltage;
wherein the first light-emitting diode is off and the second light-emitting diode is on when the three-state output is at the reference voltage; and
wherein the first and second light-emitting diodes are both off when the three-state output is in a high-impedance state.