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contactless chipcard interface (CCI)

The Contactless Chipcard Interface(CCI) is the air interface of contactless chipcards. It is used for bidirectional communication between the RFID card or radio tag and the RFID reader. In addition, the CCI interface is used to supply the passive contactless smart card with power.

On the RFID card, the CCI interface is formed by two coils. In conjunction with capacitors, these coils act as oscillating circuits that are tuned to the radio frequencies. The supply voltage is generated by rectifying the carrier signal of the RFID reader. The supply voltage is 5 V with a power of up to 100 mW.

A synchronization signal is derived from the modulated carrier signals as a clock signal for the smart card. The air interface has a radio range of about one meter.

Informations:
Englisch: contactless chipcard interface - CCI
Updated at: 04.04.2011
#Words: 127
Links: common content inspection (CCI), interface (I/F), bidirectional (BiDi), communication (COM), RFID card
Translations: DE
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