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NXP Semiconductors
UM191812
PN544 C2 User Manual
191812
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2010. All rights reserved.
User Manual
Rev. 1.2 — 2010-06-16
93 of 172
9.6.4 NFC-IP1 in Polling Loop
If NFC-IP1 Initiator gate is setup (Pipe Opened, and
NXP_NFCI_MODE
registry set with
at least one baudrate). The NFC-IP1 Initiator mode will be executed during the ‘Reader
phase’ of the Polling Loop.
If NFC-IP1 Target gate is setup (Pipe Opened, and
NXP_NFCT_MODE
registry set with
at least one baudrate). The NFC-IP1 Target mode will be executed during the ‘Emulation
phase’ of the Polling Loop.
9.6.5 Multi Secure Element
In the case of Card Emulation over SWP/UICC and NFC-WI enable, PN544 cannot
present multiple cards to the external PCD. It is up to the host to manage the Secure
Element enabled.
At application level, host can decide to enable or disable each link.
For SWP/UICC, host can use the
NXP_EVT_SWP_SWITCH_MODE
event to
disable/enable the link
.
For NFC-WI, the use of
NXP_EVT_SE_SWITCH_MODE
event
is recommended to
temporary switch the NFC-WI Secure Element in ‘Off mode’.
9.6.6 RF Configuration
9.6.6.1 Card Emulation RF Step
Around 45us after RF ON of a reader, due to an internal reconfiguration, PN544 as card
or passive target can impact the reader RF field for around 5us.
The amplitude of the RF decreased will depend on antenna tuning of both sides and of
their coupling factor. There is no issue for passing certification.