Patent ID: 8649822
Filing Date: 2014-02-11
Classification: G06K,H04M

Abstract:
1. A secure digital card, coupled to a cell phone, comprising: a smart card, coupled to a near field communication (NFC) controller via a single wire protocol (SWC) interface, comprising a power receive pin; a secure digital card controller (SDC), coupled to the cell phone via a standard input output (SDIO) interface, and coupled to the smart card via an ISO-7816 interface; a first power control circuit, coupled between a first power supply pin of the NFC controller and the power receive pin of the smart card; and a second power control circuit, coupled between a second power receive pin of the SDC and the power receive pin of the smart card; wherein when the cell phone wants to perform a near-end payment process, the SDC controls the first power control circuit to supply a first voltage generated by the first power supply pin of the NFC controller to the power receive pin of the smart card; and when the cell phone wants to perform a far-end payment process, the SDC controls the second power control circuit to supply a second voltage generated by the second power supply pin of the SDC to the power receive pin of the smart card.