Data Sheet
PN512_C1_SDS All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved.
Product short data sheet
COMPANY PUBLIC
Rev. 3.2 — 20 September 2012
120132 15 of 27
NXP Semiconductors
PN532/C1
Near Field Communication (NFC) controller
7.1.4.2 PASSIVE Communication mode
Passive Communication Mode means that the target answers to an Initiator command in a
load modulation scheme.
The following table gives an overview of the active communication modes:
Fig 9. Passive NFC mode
Table 9. Communication overview for NFC Passive Communication mode
Communication scheme ISO/IEC 18092, ECMA 340, NFCIP-1
Baud rate 106 kbit/s 212 kbit/s 424 kbit/s
Bit length
PN532 to
PICC/Card
Modulation 100% ASK 100% ASK 100% ASK
Bit coding Modified Miller
coding
Modified
Miller coding
Modified
Miller coding
PICC/Card to
PN532
Modulation Subcarrier load
modulation
>12% ASK >12% ASK
Subcarrier
frequency
13.56 MHz
⁄
16
No subcarrier No subcarrier
Bit coding Manchester coding Manchester coding Manchester coding
1. Initiator starts communication
PN532
NFC Initiator
Host
PN532
NFC Target
Host
2. Targets answers using load modulation
PN532
NFC Initiator
Host
PN532
NFC Target
Host
at selected transfer speed
at the same transfer speed
Power to generate
the field
Power for digital
processing
Power to generate
the field
Power for digital
processing
128
13.56MHz
--------------------------
9.44s
64
13.56MHz
--------------------------
4.72s
32
13.56MHz
--------------------------
2.36s