AS3953A-BSDF datasheet(18/71 Pages) AMSOSRAM

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ams Datasheet

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[v1-05] 2019-Feb-15

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AS3953A − Detailed Description

Coding of UID

Anti-collision procedure is based on Unique Identification

Number (UID). The AS3953A supports double UID size (7 bytes).

First three bytes of UID are hard-wired inputs to the PICC Logic

(uid<23:0>). Last 4 bytes of UID are stored in EEPROM UID word.

First Byte of UID (uid0)

First byte of UID is according to [ISO3] ISO/IEC 7816-6 IC

Manufacturer ID. It is coded on bits uid<7:0>. ams IC

Manufacturer ID is 3F(hex).

Second Byte of UID (uid1)

Second byte of UID – uid<15:8> is reserved for ams chip type

(IC Type). Every ams RFID tag IC has its own chip type attributed.

Therefore PCD which has read the RFID tag UID knows to which

tag IC it is talking.

The AS3953A IC type is 10(hex).

Third Byte of UID (uid2)

Third byte of UID – uid<23:16> is set to 00(hex). Figure below

defines the coding of the first three bytes of UID.

Figure 13:

Coding of First Three Bytes of UID

The last 4 bytes of UID are read from EEPROM (UID word). Figure

below defines the last four bytes of UID.

Figure 14:

Coding of Last Four Bytes of UID

UID Byte

FL Signal Name

Value (hex)

uid0

uid<7:0>

uid1

uid<15:8>

uid2

uid<23:16>

UID Byte

UID Word Bits

uid3

b7-b0

uid4

b15-b8

uid5

b23-b16

uid6

b31-b24

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