Datasheet

PN512 All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2016. All rights reserved.
Product data sheet
COMPANY PUBLIC
Rev. 5.2 — 16 June 2016
111352 19 of 137
NXP Semiconductors
PN512
Full NFC Forum-compliant frontend
7.4.2 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.
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.
Fig 12. Passive communication mode
Table 11. Communication overview for Passive communication mode
Communication
direction
106 kbit/s 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
% ASK Manchester Coded
digital capability to handle
this communication
Target  Initiator According to
ISO/IEC 14443A
subcarrier load
modulation,
Manchester Coded
According to FeliCa, > 12 %
ASK Manchester Coded
host
NFC INITIATOR
powered to
generate RF field
1. initiator starts communication
at selected transfer speed
2. targets answers using
load modulated data
at the same transfer speed
host
NFC TARGET
powered for
digital processing
001aan217