AS3953B datasheet(15/65 Pages) AMSOSRAM

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[v1-04] 2016-Jan-07

AS3953B − Detailed Description

DESELECT puts the PICC Logic in HALT state. An interrupt is sent

to controller upon reception of DESELECT command to inform

it that PCD stopped the Level-4 communication.

Additionally to supporting the ISO14443-4 transmitting

protocol the PICC Logic accepts also proprietary commands.

Proprietary commands are identified by setting the two MSB

bits of first transmitted byte to ‘01’ (This combination is not

used by ISO 14443A Level-4 protocol). The following custom

commands are implemented:

• Wake-Up: Sends a wake-up interrupt to controller

• Read EEPROM: Reads data from EEPROM

• Write EEPROM: Writes data to EEPROM

Support of ISO 14443A Optional Features

• CID is supported

• NAD is not supported

• Historical bytes are not supported

• Power level indication is not supported

Coding of UID

Anti-collision procedure is based on Unique Identification

Number (UID). The AS3953B 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 AS3953B 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

UID Byte

FL Signal Name

Value (hex)

uid0

uid<7:0>

uid1

uid<15:8>

uid2

uid<23:16>

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