Passive Mode
In passive mode only the device that starts the communication (the initiator) produces the 13.56 MHz carrier field. A target introduced to this field may use it to draw energy but must not generate a carrier field at its own. The initiator transfers data by directly modulating the field, the target by load-modulating it. In both directions the coding complies with ISO14443 or FeLiCa, respectively. This mode enables NFC-devices to communicate with existing contactless smart cards. The term load modulation describes the influence of load changes on the initiator’s carrier field’s amplitude. These changes can be perceived as information by the initiator. Depending on the size of the coils, ranges up to 10 cm and data rates of 106, 212, and 424 kBit/sec are possible.