NT3H2111 Datasheet, PDF (23/77 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
8.3.11 Password and Access Configuration
NTAG I²C plus can be configured to have password protected memory areas.
If this feature is used, NXP recommends changing and diversify the PWD and PACK for
every single chip.
The password and access configuration area of pages E3h to E7h (Sector 0 - see Table 9)
via the NFC interface or blocks 38h and 39h via the I²C interface are used to configure the
password and access conditions of the NTAG I²C plus. Those bit values are stored in the
EEPROM. Their values can be read and written by both interfaces when applicable and
when not locked by the register lock bits (see REG_LOCK in Table 13).
AUTH0 defines the starting page address of the protected area in Sector 0. NXP
recommends setting AUTH0 in a way always respecting the lock bit granularity. Setting
AUTH0 greater EBh, disables password protection.
The NFC_PROT bit is used to either only require a PWD_AUTH for writing data to the
protected area or even protect reading data from the protected area.
If password authentication is used, even the SRAM access can be protected by setting
SRAM_PROT bit to 1b.
I2C_PROT enables the possibility to limit access to the protected area from I²C
perspective to read only or no access at all.
AUTLIM value can be used to limit negative PWD_AUTH attempts.
For the 2k version of NTAG I²C plus NFC_DIS_SEC1 bit can be used to disable the
access to Sector 1 from NFC perspective with the 2K_PROT bit password protection for
Sector 1 can be enabled.
Once password protection is enabled, writing to Password and Access Configuration
bytes is only possible after a successful password authentication. On reading the PWD or
PACK, from NFC or I²C perspective, NTAG I²C plus always returns all 00h bytes.
A detailed description of the mechanism and how to program all the parameters is given in
Section 8.7.
Table 9. Password and Access Configuration Register
NFC page address
(Sector 0)
I²C block address
Byte number from NFC perspective
Dec
Hex
Dec
Hex
0
1
2
3
224
E0h 56
38h
225
E1h
User Memory
226
E2h
Dynamic lock bytes
00h
227
E3h
RFU
RFU
RFU
AUTH0
228
E4h
57
39h
ACCESS
RFU
RFU
RFU
229
E5h
PWD
230
E6h
PACK
RFU
RFU
231
E7h
PT_I2C
RFU
RFU
RFU
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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