PN544 데이터 시트보기 (PDF) - NXP Semiconductors.

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PN544

Near field communication (NFC) controller

NXP Semiconductors. 

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NXP Semiconductors

PN544

Near field communication (NFC) controller

8.2.1 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.

Host

NFC Initiator

1. Initiator starts communication

at selected transfer speed

NFC Target

Host

powered to

generate RF field

2. Targets answers using

load modulated data

at the same transfer speed

powered for digital

processing

Fig 9. Passive Communication mode

Table 8. Communication Overview for Passive Communication mode

Communication

direction

106 kbit/s

212 kbit/s

424 kbit/s

Initiator → Target

According to ISO 14443A

100% ASK, Modified

Miller Coded

According to FeliCa, 8-30% ASK

Manchester Coded

Target → Initiator

According to ISO 14443A

subcarrier load modulation,

Manchester Coded

According to FeliCa, >12% ASK

Manchester Coded

The contactless UART and the on-chip CPU of the PN544 handle the complete NFC-IP1

RF-protocol, nevertheless a dedicated external host has to handle the application layer

communication.

134812

Objective short data sheet

Rev. 1.2 — 4 September 2007

© NXP B.V. 2007. All rights reserved.

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