NT3H2111 Datasheet, PDF (18/77 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
MSB
LSB
0 0 0 0 0 1 0 0 manufacturer ID for NXP Semiconductors (04h)
page 0
byte UID0 UID1 UID2 UID3
Fig 7. Serial number (UID)
page 1
UID4 UID5 UID6 SAK
7 bytes UID
page 2
0123
ATQA0
ATQA1
lock bytes
aaa-012802
8.3.6 Static Lock Bytes
According to NFC Forum Type 2 Tag specification the bits of byte 2 and byte 3 of page
02h (via NFC) or byte 10 and 11 address 00h (via I²C) represent the field programmable,
read-only locking mechanism (see Figure 8). Each page from 03h (CC) to 0Fh can be
individually locked by setting the corresponding locking bit to logic 1b to prevent further
write access. After locking, the corresponding page becomes read-only memory.
In addition NTAG I²C plus uses the three least significant bits of lock byte 0 as the
block-locking bits. Bit 2 controls pages 0Ah to 0Fh (via NFC), bit 1 controls pages 04h to
09h (via NFC) and bit 0 controls page 03h (CC). Once the block-locking bits are set, the
locking configuration for the corresponding memory area is frozen, e.g. cannot be
changed to read-only anymore.
MSB
LSB MSB
LSB
L L L L L BL BL BL
7 6 5 4 CC 15-10 9-4 CC
LLLLLLLL
15 14 13 12 11 10 9 8
NT3H2111/NT3H2211
Product data sheet
COMPANY PUBLIC
page 2
0123
lock byte 0
lock byte 1
Lx locks page x to read-only
BLx blocks further locking for the memory area x
aaa-006983
Fig 8. Static lock bytes 0 and 1
For example, if BL15-10 is set to logic 1b, then bits L15 to L10 (lock byte 1, bit[7:2]) can no
longer be changed. The static locking and block-locking bits are set by the bytes 2 and 3
of the WRITE command to page 02h. The contents of the lock bytes are bit-wise OR’ed
and the result then becomes the new content of the lock bytes. This process is irreversible
from NFC perspective. If a bit is set to logic 1b, it cannot be changed back to logic 0b.
From I²C perspective, the bits can be reset to 0b by writing bytes 10 and 11 of block 00h.
As I²C address is coded in byte 0 of block 0, it may be changed unintentionally.
The contents of bytes 0 and 1 of page 02h (via NFC) are unaffected by the corresponding
data bytes of the WRITE command.
The default value of the static lock bytes is 0000h.
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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