AS3953 datasheet(30/71 Pages) AMSOSRAM

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ams Datasheet

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[v1-05] 2019-Feb-15

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AS3953A − Detailed Description

EEPROM

The AS3953A contains an EEPROM block which can be accessed

from both RFID and SPI interface. EEPROM contains 1024 bits

(128 bytes) organized in 32 words of 32 bits. Words in EEPROM

are number from 0 to 31(1F[hex]). Bits in a word are numbered

from 0 to 31.

Most of the EEPROM is used to store user data (27 words – 864

bits), five words are used to store some housekeeping

information (part of the AS3953A UID, configuration bits which

define the AS3953A operating options, lock bits, which control

the possibility to write EEPROM words).

Figure 35:

EEPROM Organization

Access properties:

RO: Read only, writing to this word is not possible

RW: Reading and writing to this word is possible, writing is

disabled once the lock bit is set

OTP: One time programmable. A bit of this word once set to ‘1’

cannot be set back to ‘0’.

UID Word

The UID word contains four LSB bytes of 7 byte UID which is

used during anti-collision and selection process. Every IC is

programmed by a unique number during fabrication process at

ams. For details on UID, please refer to Coding of UID .

Fabrication Data Word

This word stores some IC manufacturer data which is

programmed and locked during fabrication process at ams.

Word Address

[hex]

Content

Access

Properties

0UID

1Fabrication Data

Configuration Word

3Write Lock Word

OTP

Read Lock Word

OTP

5: 1F

User Data

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