NT3H2111 Datasheet, PDF (9/77 Pages) NXP Semiconductors – Designed to be the perfect enabler for NFC in home-automation

NXP Semiconductors
8.2.2 NFC state machine
NT3H2111/NT3H2211
NFC Forum Type 2 Tag compliant IC with I²C interface
POR
HALT
WUPA
IDLE
REQA
WUPA
READY 1
ANTICOLLISION
identification
and
selection
procedure
SELECT
cascade level 1
HLTA
HLTA
READY 2
ANTICOLLISION
SELECT
cascade level 2
ACTIVE
PWD_AUTH
AUTHENTICATED
Fig 6. NFC state machine of NTAG I²C plus
READ
FAST_READ
WRITE
FAST_WRITE
GET_VERSION
READ_SIG
READ
FAST_READ
WRITE
PWD_AUTH
GET_VERSION
READ_SIG
memory
operations
aaa-021650
The overall NFC state machine is summarized in Figure 6. When an error is detected or
an unexpected command is received, in each state the tag returns to IDLE or HALT state
as defined in ISO/IEC 14443-3 Type A.
8.2.2.1
IDLE state
After a Power-On Reset (POR), the NTAG I²C plus switches to the default waiting state,
namely the IDLE state. It exits IDLE towards READY 1 state when a REQA or a WUPA
command is received from the NFC device. Any other data received while in IDLE state is
interpreted as an error, and the NTAG I²C plus remains in the IDLE state.
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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