Datasheet

NTAG203 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2011. All rights reserved.
Product data sheet
COMPANY PROPRIETARY
Rev. 3.0 — 17 October 2011
213830 13 of 30
NXP Semiconductors
NTAG203
NFC Forum Type 2 Tag compliant IC with 144 bytes user memory
8.5.3 OTP bytes
Page 3 is the OTP page. It is preset to all “0” after production. These bytes may be
bit-wise modified by a WRITE command.
The bytes of the WRITE command and the current contents of the OTP bytes are bit-wise
“OR-ed” and the result becomes the new content of the OTP bytes. This process is
irreversible. If a bit is set to “1”, it cannot be changed back to “0” again.
8.5.4 Data pages
NTAG203 features 144 bytes of data memory. The address range from page 04h to 27h
constitutes the read/write area.
Initial state of each byte in the user area is 00h.
A write access to data memory is achieved with WRITE (see Section 8.8.7 “
WRITE”) or
COMPATIBILITY WRITE (see Section 8.8.8 “
COMPATIBILITY WRITE”) command. In
both cases, 4 bytes of memory (one page) will be overwritten. Write access to data
memory can be permanently restricted via lock bytes (see Section 8.5.2 “
Lock bytes”).
NFC Forum Type 2 Tag compliance
NTAG203 has been designed to be compliant with NFC Forum Type 2 Tag specification
(see also Ref. 5 “
Ultralight as Type 2 Tag”). With its 144 bytes of data memory, it can
easily support use cases like Smart Poster, Handover, SMS, URL or Call Request.
(1) Remark: This memory area may be used as a 32 ticks one-time counter.
Fig 8. OTP bytes
001aai004
page 3 default value
EXAMPLE
OTP bytes
byte
OTP bytes
0123
00000000 00000000 00000000 00000000
1st write command to page 3
11111111
11111100 00000101 00000111
result in page 3
11111111
11111100 00000101 00000111
2nd write command to page 3
11111111
00000000 00111001 10000000
result in page 3
11111111
11111100 00111101 10000111