AS3955 datasheet(24/102 Pages) AMSCO

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[v1-04] 2016-Feb-03

AS3955 − Detailed Description

UID Coding

Anti-collision procedure is based on the Unique Identification

Number (UID). AS3955 supports double size UID (7 bytes). First

three bytes of the UID are hardwired inputs to the PICC Logic

(uid<23:0>). The last 4 bytes of the UID are stored in EEPROM

UID block.

First UID Byte (uid0)

The first byte of UID is Manufacturer ID according to

[ISO7816-6]. It is coded on bits uid<7:0>. ams IC Manufacturer

ID is 3Fh.

Second UID Byte (uid1)

The 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

assigned. AS3955 IC type is 14h.

Third UID Byte (uid2)

The third byte of UID (uid<23:16>) is set to 00h.

Figure 19:

Coding of First Three UID Bytes

Last Four UID Bytes (uid3-uid6)

The last 4 bytes of UID are read from EEPROM (UID block) and

pre-programmed during IC production. Those 4 bytes are

unique, and cannot be modified.

Figure 20:

Last Four UID Bytes

UID Byte

Value (Hex)

uid0

uid1

uid2

UID Byte

UID Block Bits

uid3

b7-b0

uid4

b15-b8

uid5

b23-b16

uid6

b31-b24

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