MAX66120K-000AA+【PDF 11/24 页】IC RFID UID 1KB TYPEB MEM KEYFOB

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ISO 15693-Compliant 1Kb Memory Fob

ISO 15693 Slave States and

Address Modes

Initially, the master has no information whether there are

any RF devices in the field of its antenna. The master

learns the UIDs of the slaves in its field from the

responses to the Inventory command, which does not

use the Address_flag and the Select_flag bits. The state

transitions are controlled by network function com-

mands. Figure 16 shows details.

ISO 15693 defines four states in which a slave can be

plus three address modes. The states are power-off,

ready, quiet, and selected. The address modes are non-

addressed, addressed, and selected. The addressed

mode requires that the master include the slave’s UID in

the request, which increases the size of the requests by

8 bytes. Table 4 shows which address mode is applica-

ble depending on the slave’s state and how to set the

Address_flag and the Select_flag bits for each address

mode.

ISO 15693 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

ready state.

Ready State

In this state, a slave has enough power to perform any

of its functions. The purpose of the ready state is to have

the slave population ready to process the inventory

command as well as other commands sent in the

addressed or nonaddressed mode. A slave can exit the

ready state and transition to the quiet or the selected

state upon receiving the Stay Quiet or Select command

sent in the addressed mode.

Quiet State

In this state, a slave has enough power to perform any

of its functions. The purpose of the quiet state is to

silence slaves that the master does not want to commu-

nicate with. Only commands sent with the addressed

mode are accepted and processed. This way the mas-

ter can use the nonaddressed mode for communication

with remaining slaves in the ready state, which mini-

mizes the size of the request data packets. As long as

no additional slaves arrive in the RF field, it is safe for

the master to continue communicating in the nonad-

dressed mode. A slave can exit the quiet state and

transition to the ready or the selected state upon receiv-

ing the Reset to Ready or Select command sent in the

addressed mode.

Selected State

In this state, a slave has enough power to perform any

of its functions. The purpose of the selected state is to

isolate the slave that the master wants to communicate

with. Commands are accepted and processed regard-

less of the address mode in which they are sent, includ-

ing the Inventory command. With multiple slaves in the

RF field, the master can put one slave in the selected

state and leave all the others in the ready state. This

method requires less communication than using the

quiet state to single out the slave for communication.

For a slave in the selected state, the master can use the

selected mode, which keeps the request data packets

as short as with the nonaddressed mode. A new slave

entering the RF field cannot disturb the communication,

since it stays in the ready state. A slave can exit the

Table 4. Slave States and Applicable Address Modes

ADDRESS MODES

NONADDRESSED MODE

ADDRESSED MODE

SELECTED MODE

SLAVE STATES

Power-Off

Ready

Quiet

Selected

(Address_flag = 0;

Select_flag = 0)

(Inactive)

Yes

No

Yes

(Address_flag = 1;

Select_flag = 0)

(Inactive)

Yes

Yes

Yes

(Address_flag = 0;

Select_flag = 1)

(Inactive)

No

No

Yes

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