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Product data sheet
Rev. 3.3 — 3 April 2012
17 of 132
Contactless reader IC
Passive communication mode
Passive communication mode means that the target answers to an initiator command in a
load modulation scheme. The initiator is active meaning generating the RF field.
The contactless UART of CLRC663 and a dedicated host controller are required to handle
the ISO/IEC 18092 passive initiator protocol.
Fig 11. Passive communication mode
Communication overview for Passive communication mode
100 % ASK, Modified
According to FeliCa, 8 % to 30 % ASK
ISO/IEC 14443A subcarrier
According to FeliCa, > 12 % ASK
generate RF field
1. initiator starts communication
at selected transfer speed
2. targets answers using
load modulated data
at the same transfer speed