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 84 of 172
9.6.2.2 Activation Timeout for NFC-IP1 Initiator
Whe
n NFC-IP1 Initiator mode is enabled, PN544 is not able to detect absence of NFC-
IP1 Target.
After the ATR_REQ has been sent, it waits the ‘NFCI_ATR timeout’ for ATR_RES before
starting next phase of Polling Loop.
This timeout value can be changed by setting the NFCI_ATR_TOMSB/LSB EE
PROM
area. (See ’
HW configuration’ chapter).
9.6.2.3 Activation Timeout for ISO14443-PICC & NFC-IP1 Target
ISO14443 A
ctivation (fro RF Field ON up to RATS or ATTRIB) or NFC-IP1 Target
Activation (From RF Field ON up to ATR_REQ) must be completed in less than
‘TGINIT_GUARD timeout’ otherwise the ongoing RF initialization is aborted.
(No impact on use cases as external readers/initiators perform activation in short
sequence).
This timeout value can be changed by setting the TGINIT_GUARD_TO_MSB &
TGINIT_GUARD_TO_LSB EEPROM area (see ’
HW configuration’ chapter).
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