PN531 NXP Semiconductors, PN531 Datasheet - Page 12

• Manufacturer Part Number: PN531
• Description: ??c Based Transmission Module
• Manufacturer: NXP Semiconductors

Philips Semiconductors
PN531
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.
N
The PN531’s firmware and contactless UART handle the NFC protocol.
powered to
generate RF field
Host
powered for digital
Host
Communication Diagrams for active NFC communication
processing
NFC Initiator
NFC Initiator
Initial Command
1. Initiator starts communication at
selected transfer speed
Figure 5 active NFC Mode
2. Target answers at the
same transfer speed
Objective Short Form Specification Rev. 2.0 February 2004
12
Response
µC based Transmission module
NFC Target
NFC Target
powered to
generate RF field
powered for digital
processing
Host
Host