PN512_11 Datasheet, PDF (15/125 Pages) NXP Semiconductors – Transmission module Integrated data mode detector

NXP Semiconductors
PN512
Transmission module
8.4.2 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.
1. initiator starts communication
at selected transfer speed
host
NFC INITIATOR
host
NFC TARGET
powered to
generate RF field
2. targets answers using
load modulated data
at the same transfer speed
powered for
digital processing
Fig 11. Passive communication mode
001aan217
Table 10. Communication overview for Passive communication mode
Communication 106 kbit/s
direction
212 kbit/s
424 kbit/s
848 kbit/s
1.69 Mbit/s,
3.39 Mbit/s
Initiator → Target
According to
ISO/IEC 14443A
100 % ASK,
Modified
Miller Coded
According to FeliCa, 8-30 digital capability to handle
% ASK Manchester Coded this communication
Target → Initiator
According to
According to FeliCa, > 12 %
ISO/IEC 14443A ASK Manchester Coded
subcarrier load
modulation,
Manchester Coded
The contactless UART of PN512 and a dedicated host controller are required to handle
the NFCIP-1 protocol.
Note: Transfer Speeds above 424 kbit/s are not defined in the NFCIP-1 standard. The
PN512 supports these transfer speeds only with dedicated external circuits.
PN512
Product data sheet
COMPANY PUBLIC
All information provided in this document is subject to legal disclaimers.
Rev. 3.7 — 18 May 2011
111337
© NXP B.V. 2011. All rights reserved.
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