NT3H2111 Datasheet, PDF (10/77 Pages) NXP Semiconductors – Designed to be the perfect enabler for NFC in home-automation

NXP Semiconductors
NT3H2111/NT3H2211
NFC Forum Type 2 Tag compliant IC with I²C interface
8.2.2.2 READY 1 state
In the READY 1 state, the NFC device resolves the first part of the UID (3 bytes) using the
ANTICOLLISION or SELECT commands for cascade level 1. READY 1 state is correctly
exited after execution of the following command:
• SELECT command from cascade level 1 with the matching complete first part of the
UID: the NFC device switches the NTAG I²C plus into READY 2 state where the
second part of the UID is resolved.
8.2.2.3 READY 2 state
In the READY 2 state, the NFC device resolves the second part of the UID (4 bytes) using
the ANTICOLLISION or SELECT command for cascade level 2. READY2 state is
correctly exited after execution of the following command:
• SELECT command from cascade level 2 with the matching complete second part of
the UID: the NFC device switches the NTAG I²C plus into ACTIVE state where all
application-related commands can be executed.
Remark: The response of the NTAG I²C plus to the SELECT command is the Select
AcKnowledge (SAK) byte. In accordance with ISO/IEC 14443-3 Type A, this byte
indicates if the anticollision cascade procedure has finished. If finished, the NTAG I²C plus
is now uniquely selected and only this device will communicate with the NFC device even
when other contactless devices are present in the NFC device field.
8.2.2.4 ACTIVE state
All unprotected memory operations are operated in the ACTIVE and AUTHENTICATED
states.
The ACTIVE state is exited with the PWD_AUTH command and upon reception of a
correct password, the NTAG I²C plus transits to AUTHENTICATED state after responding
with PACK or with the HLTA command the NTAG I²C plus transits to the HALT state.
Any other data received when the device is in ACTIVE state is interpreted as an error.
Depending on its previous state, the NTAG I²C plus returns to either to the IDLE or HALT
state.
8.2.2.5 AUTHENTICATED state
Protected memory operations are only operated in the AUTHENTICATED state, however
access to the unprotected memory is possible, too.
The AUTHENTICATED state is exited with the HLTA command and upon reception, the
NTAG I²C plus transits to the HALT state. Any other data received when the device is in
AUTHENTICATED state is interpreted as an error. Depending on its previous state, the
NTAG I²C plus returns to either to the IDLE or HALT state.
8.2.2.6
HALT state
HALT and IDLE states constitute the two waiting states implemented in the NTAG I²C
plus. An already processed NTAG I²C plus in ACTIVE or AUTHENTICATED state can be
set into the HALT state using the HLTA command. In the anticollision phase, this state
helps the NFC device distinguish between processed tags and tags yet to be selected.
NT3H2111/NT3H2211
Product data sheet
COMPANY PUBLIC
All information provided in this document is subject to legal disclaimers.
Rev. 3.0 — 3 February 2016
359930
© NXP Semiconductors N.V. 2016. All rights reserved.
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