AS3955 datasheet(19/111 Pages) AMSCO

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[v1-01] 2015-Apr-29

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AS3955 − Detailed Description

NFC Tag Functionality

Communication Principle

AS3955 autonomously executes complete NFC-A anti-collision

communication sequence, during which the 7-byte UID is used

([NFC Analog] [NFC Digital]). After anti-collision, the NFC tag is

brought into SELECTED state where read and write commands

can be processed. The NFC tag will accept only read and write

command issued to the address space actually available in

AS3955 EEPROM. Any attempt to access an address outside the

internal memory address space will be rejected. This default

behavior of the NFC tag can be modified by enabling Tunneling

or Extended mode.

A simplified AS3955 state diagram is shown in Figure 17.

Figure 17:

AS3955 State Diagram

POWER OFF

(RF field off)

SENSE

SLEEP

AUTHENTICATED

Reset

ALL_REQ

SENS_REQ

ALL_REQ

WRITE

Authentication Password

READ (16 bytes)

WRITE (4 bytes)

GET VERSION

RESOLUTION

ANTI-COLLISION

SEL_REQ

SLP_REQ

SELECTED

READ (16 bytes)

WRITE (4 bytes)

GET VERSION

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