MAX66020K-000AA+【PDF 17/25 页】IC RFID UID 1KB TYPEB MEM KEYFOB

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ISO/IEC 14443 Type B-Compliant

1Kb Memory Fob

ISO/IEC 14443 Type B States and

Transitions

POWER-OFF State

This state applies if the slave is outside the master’s RF

field. A slave transitions to the POWER-OFF state when

leaving the power-delivering RF field. When entering

the RF field, the slave automatically transitions to the

IDLE state.

IDLE State

The purpose of the IDLE state is to have the slave pop-

ulation ready to participate in the anticollision protocol.

When transitioning to the IDLE state, the slave does not

generate any response. To maintain this state, the slave

must continuously receive sufficient power from the

master ’s RF field to prevent transitioning into the

POWER-OFF state. While in the IDLE state, the slave lis-

tens to the commands that the master sends, but reacts

only on the REQB and WUPB commands, provided that

they include a matching AFI value. If the master sends

a command with a nonmatching AFI byte (conditions A

and a), a transition to IDLE is also possible from the

HALT state, the READY state, and the WAITING FOR

SLOT-MARKER state. From IDLE, a slave can transition

to the higher states READY (condition B) or WAITING

FOR SLOT-MARKER (condition S). For details, see the

REQB/WUPB command description in the Network

Function Commands section.

WAITING FOR SLOT-MARKER State

(READY REQUESTED SUBSTATE)

The WAITING FOR SLOT-MARKER state is used in the

time-slot anticollision approach. A slave can transition

to WAITING FOR SLOT-MARKER from the IDLE, HALT,

or READY state upon receiving a REQB or WUPB com-

mand with a matching AFI (conditions S and s), provid-

ed that both the number of slots specified in the

REQB/WUPB command and the random number that

the slave has chosen are different from 1. To maintain

this state, the slave must continuously receive sufficient

power from the master’s RF field to prevent transitioning

into the POWER-OFF state. A slave in the WAITING

FOR SLOT-MARKER state listens to the commands that

the master sends, but reacts only on the REQB, WUPB,

and SLOT-MARKER commands. From WAITING FOR

SLOT-MARKER, a slave can transition to the higher

state READY under condition B (bypassing the Slot-

MARKER), or MS (matching slot, SLOT-MARKER com-

mand with a slot number that matches the random

number R). Condition A (AFI mismatch) returns the

slave to the IDLE state.

READY State (READY DECLARED SUBSTATE)

The READY state applies to a slave that has met the cri-

teria in the anticollision protocol to send an ATQB

response. A slave can transition to READY from IDLE or

HALT (conditions B and b) or from WAITING FOR

SLOT-MARKER (conditions B and MS). When transition-

ing to the READY state, the slave transmits an ATQB

response. To maintain this state, the slave must contin-

uously receive sufficient power from the master’s RF

field to prevent transitioning into the POWER-OFF state.

A slave in the READY state listens to the commands

that the master sends, but reacts only on the REQB,

WUPB, ATTRIB and HLTB commands. From READY, a

slave can transition to ACTIVE (ATTRIB command with

matching PUPI), HALT (HLTB command with matching

PUPI), or IDLE (condition A).

HALT State

The HALT state is used to silence slaves that have

been identified and shall no longer participate in the

anticollion protocol. This state is also used to park

slaves after communication in the ACTIVE state was

completed. A slave transitions to the HALT state either

from READY (HLTB command with matching PUPI) or

from ACTIVE (DESELECT command with matching

CID). When transitioning to the HALT state, the slave

transmits a response that confirms the transition. To

maintain this state, the slave must continuously receive

sufficient power from the master’s RF field to prevent

transitioning into the POWER-OFF state. The normal

way out of the HALT state is through the WUPB com-

mand. From HALT, a slave can transition to IDLE (con-

dition a), READY (condition b), or WAITING FOR

SLOT-MARKER (condition s).

ACTIVE State

The ACTIVE state enables the slave to process com-

mands sent through the block transmission protocol.

When entering the ACTIVE state, the slave confirms the

transition with a response. The only way for a slave to

transition to the ACTIVE state is from the READY state

(ATTRIB command with a matching PUPI). In the

ATTRIB command, the master assigns a 4-bit CID that

is used to address one of multiple slaves that could all

be in the ACTIVE state. To maintain this state, the slave

must continuously receive sufficient power from the

master ’s RF field to prevent transitioning into the

POWER-OFF state. The normal way out of the ACTIVE

state is through the DESELECT command, which transi-

tions the slave to the HALT state.

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