SRT512_12 Datasheet, PDF (28/46 Pages) STMicroelectronics – 13.56 MHz short-range contactless memory chip with 512-bit EEPROM and anticollision functions

SRT512 commands
SRT512
8.1
Initiate() command
Command code = 06h - 00h
Initiate() is used to initiate the anticollision sequence of the SRT512. On receiving the
Initiate() command, all SRT512 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 SRT512 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 22. Initiate request format
SOF
Initiate
06h
00h
Request parameter:
● No parameter
Figure 23. Initiate response format
CRCL
8 bits
CRCH
8 bits
EOF
AI07670b
SOF
Chip_ID
8 bits
CRCL
8 bits
CRCH
8 bits
Response parameter:
● Chip_ID of the SRT512
Figure 24. Initiate frame exchange between reader and SRT512
EOF
AI07671
Reader _{SOF 06h}
SRT512
00h CRCL CRCH EOF
<-t0-> <-t1-> SOF Chip_ID CRCL CRCH EOF
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Doc ID 13277 Rev 6