Patent ID: 11893435
Assignee: SAMSUNG ELECTRONICS CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 5:
6. The internal voltage generation circuit of claim 1, wherein the mode selector includes:
a comparator configured to compare the contactless voltage and the contact voltage to output a comparison signal;
a contact detector configured to output a detection signal associated with detecting an external reset signal based on the external reset signal received from the card reader in the contact mode;
a mode signal generator configured to generate the first mode signal and a contact mode signal designating the contact mode based on the comparison signal and the detection signal;
a class detector configured to be enabled in response to the contact mode signal, configured to compare the contact voltage with a first reference voltage and a second reference voltage to generate the second mode signal indicating a class of the card reader, associated with a sub-mode among the plurality of sub-modes, the second reference voltage being smaller than the first reference voltage;
a level comparator configured to compare the contact voltage, the contactless voltage and a first node voltage at the first node to output a selection signal indicating a highest voltage from among the contact voltage, the contactless voltage and the first node voltage; and
a multiplexer configured to output the highest voltage from among the contact voltage, the contactless voltage and the first node voltage as the control voltage in response to the selection signal.