MAX66000K-000AA+【PDF 14/21 页】IC RFID UID 64BIT TYPE B KEY FOB

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ISO/IEC 14443 Type B-Compliant

64-Bit UID

1ST BYTE

BIT RATE CAPABILITY

77h

2ND BYTE

MAXIMUM FRAME SIZE, PROTOCOL TYPE

11h

3RD BYTE,

UPPER NIBBLE

FWI

0110b

3RD BYTE,

BIT 4, BIT 3

ADC

00b

3RD BYTE,

BIT 2, BIT 1

FO

01b

Figure 21. Protocol Info Field Details

SOF

COMMAND

PUPI

CRC

EOF

SOF

INDICATOR

CRC

EOF

50h

(4 BYTES)

(2 BYTES)

00h

(2 BYTES)

Figure 22. HLTB Request Frame

The bit-rate capability of the MAX66000 ranges from

105.9kbps to 847.5kbps in both directions (request and

response); request and response bit rate need not be

the same. The maximum frame size (upper nibble of the

2nd byte) of any request/response specifies 24 bytes.

The largest frame that occurs with the MAX66000 is 19

bytes (Get System Information response). The protocol

type (lower nibble of the 2nd byte) specifies that the

MAX66000 supports the ISO/IEC 14443-4 block trans-

mission protocol. The FWI code 0110b specifies a

frame waiting time of 19.3ms. Note that a slave may

respond long before the maximum frame waiting time is

expired. The ADC code 00b specifies that the

MAX66000 uses proprietary coding for the application

data field. The FO code 01b implies that the MAX66000

supports CID, but does not support the NAD field in the

ISO/IEC 14443-4 block transmission protocol.

HLTB Command

The HLTB command is the only network function com-

mand to silence a slave by parking it in the HALT state.

If, based on the ATQB response, the master does not

want to further communicate with the slave, the master

issues the HLTB command. Figures 22 and 23 show the

format of the HLTB request frame and the correspond-

ing response frame. The data to be used in the PUPI

field must match the PUPI information that the slave has

transmitted in the ATQB response. While in the HALT

state, the slave only responds to the WUPB request.

Figure 23. HLTB Response Frame

ATTRIB Command

The ATTRIB command is the only way to select a slave

and make it process commands that are transmitted

according to the ISO/IEC 14443 block transmission pro-

tocol. If, based on the ATQB response, the master

wants to communicate with the slave, the master must

put the slave into the ACTIVE state using the slave

selection command ATTRIB. The normal way for the

master to move a slave out of the ACTIVE state is by

sending a DESELECT command, which uses an

S-block to convey a network function command.

Figure 24 shows the format of the ATTRIB request

frame. The data to be used in the PUPI field must

match the PUPI information that the slave has transmit-

ted in the ATQB response. Param 1 tells the slave how

much time the master needs to switch from transmit to

receive (TR0), how much time the master needs to syn-

chronize to the slave’s subcarrier (TR1), and whether

the master is capable of receiving response frames

without SOF and/or EOF.

The MAX66000 ignores the data of Param 1. To ease

requirements for ISO/IEC 14443 Type B readers, the

MAX66000 has TR0 and TR1 fixed at 128/fs (151μs; fs

is the subcarrier frequency of 847.5kHz) and always

begins and ends its responses with SOF and EOF,

respectively.

SOF

COMMAND

PUPI

PARAM 1

PARAM 2

PARAM 3

PARAM 4

HLINF

CRC

EOF

1Dh

(4 BYTES)

(1 BYTE)

(1 BYTE)

01h

(1 BYTE)

( ≥ 0 BYTES) (2 BYTES)

Figure 24. ATTRIB Request Frame

14

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