ST25TV512 datasheet(64/90 Pages) STMICROELECTRONICS

64 / 90 page

On receiving the Fast Inventory Initiated request, the ST25TV02K/512 run the anticollision sequence.

The Inventory_flag must be set to 1. The data rate of the response is multiplied by 2.

The ST25TV02K/512 do not generate any answer if an error occurs.

Table 131. Fast Inventory Initiated request format

Request SOF Request_flags

Fast Inventory

Initiated

IC Mfg code AFI (1) Mask length Mask value

CRC16

request

EOF

8 bits

C1h

02h

8 bits

0 -64 bits

16 bits

1. The field is optional.

Request parameters:

•

Request flags

•

Fast Inventory Initiated command code

•

AFI if the AFI flag is set

•

mask length

•

mask value

Table 132. Fast Inventory Initiated response format when Error_flag is NOT set

Response SOF

Response_flags

DSFID

UID

CRC16 request

EOF

8 bits

64 bits

16 bits

Response parameter:

•

DSFID

•

Unique ID

During an Inventory process, if the VCD does not receive an RF ST25TV02K/512 response, it waits t3 time before

sending an EOF to switch to the next slot. t3 starts from the rising edge of the request EOF sent by the VCD.

•

If the VCD sends a 100% modulated EOF, the minimum value of t3 is:

–

t3min = 4384 / fC (323.3 μs) + tSOF

•

If the VCD sends a 10% modulated EOF, the minimum value of t3 is:

–

t3min = 4384/fC (323.3 μs) + tNRT

where:

•

tSOF is the time required by the ST25TV02K/512 to transmit an SOF to the VCD.

•

tNRT is the nominal response time of the ST25TV02K/512.

•

tNRT and tSOF are dependent on the ST25TV02K/512-to-VCD data rate and subcarrier modulation mode.

Note:

In case of error, no response is sent by ST25TV02K/512.

6.4.34

Fast Initiate

On receiving the Fast Initiate command, the ST25TV02K/512 set the internal Initiate_flag and sends back a

response. The command has to be issued in the Non Addressed mode only (Select_flag is reset to 0 and

Address_flag is reset to 0). If an error occurs, the ST25TV02K/512 do not generate any answer. The Initiate_flag

is reset after a power off of the ST25TV02K/512. The data rate of the response is multiplied by 2.

Table 133. Fast initiate request format

Request SOF

Request_flags

Fast initiate

IC Mfg code

CRC16 request

EOF

8 bits

C2h

02h

16 bits

Request parameters:

ST25TV02K ST25TV512

RF commands

DS12074 - Rev 11

page 64/90

ST25TV512 Datasheet(PDF) 64 Page - STMicroelectronics

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