Single Wire Protocol

The Single Wire Protocol (SWP) is a specification for a single-wire connection between the <a href="/facts/Subscriber_Identity_Module/NUeSqoG1">SIM card</a> and a <a href="/facts/Near_field_communication/awqd3Ea8">near field communication</a> (NFC) chip in a cell phone. It was under final review by the <a href="/facts/European_Telecommunications_Standards_Institute/8rJbbhPg">European Telecommunications Standards Institute</a> (ETSI)[when?].
SWP is an interface between contactless frontend (CLF) and <a href="/facts/Universal_integrated_circuit_card/cLEwJIRs">universal integrated circuit card</a> (UICC/SIM card chip). It is a contact-based protocol that is used for contactless communication. C6 pin of UICC is connected to CLF for SWP support. It is a bit-oriented <a href="/facts/Full_duplex/LCULeVxr">full duplex</a> protocol, i.e. at the same time transmission as well as reception is possible. CLF acts as a master and UICC as a slave. CLF provides the UICC with energy, a transmission clock, data, and a signal for bus management. The data to be transmitted are represented by the binary states of voltage and current on the single wire.

Single Wire Protocol open-in-new

Single Wire Protocol