PN531 Datasheet, PDF (12/19 Pages) NXP Semiconductors – μC based Transmission module

Philips Semiconductors
PN531
Objective Short Form Specification Rev. 2.0 February 2004
µC based Transmission module
4.2.1 ACTIVE NFC MODE
Active NFC Mode means both the initiator and the target use their own RF field to enable the
communication.
• Communication Diagrams for active NFC communication
Initial Command
Host
NFC Initiator
powered to
generate RF field
1. Initiator starts communication at
selected transfer speed
Response
Host
NFC Target
powered for digital
processing
Host
NFC Initiator
powered for digital
processing
Host
2. Target answers at the ^{NFC Target}
same transfer speed
powered to
generate RF field
Figure 5 active NFC Mode
The PN531’s firmware and contactless UART handle the NFC protocol.
12