ST25TB02K datasheet(23/47 Pages) STMICROELECTRONICS

Part #	ST25TB02K

Description	13.56 MHz short-range contactless memory chip with 2048-bit EEPROM and anticollision functions

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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23 / 47 page

8.1

Initiate() command

Command code = 06h - 00h

Initiate() is used to initiate the anticollision sequence of the ST25TB02K. On receiving the Initiate() command,

all ST25TB02K devices in Ready state switch to Inventory state, set a new 8-bit Chip_ID random value, and

return their Chip_ID value. This command is useful when only one ST25TB02K in Ready state is present in the

reader field range. It speeds up the Chip_ID search process. The Chip_slot_number is not used during Initiate()

command access.

Figure 18. Initiate request format

SOF

Initiate

CRCL

CRCH

EOF

06h

00h

8 bits

Request parameter:

•

No parameter

Figure 19. Initiate response format

SOF

Chip_ID

CRCL

CRCH

EOF

8 bits

Response parameter:

•

Chip_ID of the ST25TB02K

Figure 20. Initiate frame exchange between reader and ST25TB02K

Reader

ST25TBxxx

SOF Chip_ID CRCL CRCH EOF

<-t0-><-t1->

SOF

06h

CRCL CRCH EOF

00h

ST25TB02K

Initiate() command

DS11469 - Rev 7

page 23/47

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