SRT512_09 Datasheet, PDF (31/46 Pages) STMicroelectronics – 13.56 MHz short-range contactless memory chip with 512-bit EEPROM and anticollision functions

SRT512
SRT512 commands
8.4
Select(Chip_ID) command
Command code = 0Eh
The Select() command allows the SRT512 to enter the Selected state. Until this command is
issued, the SRT512 will not accept any other command, except for Initiate(), Pcall16() and
Slot_marker(). The Select() command returns the 8 bits of the Chip_ID value. An SRT512 in
Selected state, that receives a Select() command with a Chip_ID that does not match its
own is automatically switched to Deselected state.
Figure 31. Select request format
SOF
Select
0Eh
Chip_ID
8 bits
CRCL
8 bits
CRCH
8 bits
Request parameter:
● 8-bit Chip_ID stored during the anticollision sequence
Figure 32. Select response format
EOF
AI07677b
SOF
Chip_ID
8 bits
CRCL
8 bits
CRCH
8 bits
EOF
Response parameters:
● Chip_ID of the selected tag. Must be equal to the transmitted Chip_ID
Figure 33. Select frame exchange between reader and SRT512
AI07671
Reader _{SOF 0Eh Chip_ID CRCL CRCH EOF}
SRT512
<-t0-> <-t1-> SOF Chip_ID CRCL CRCH EOF
AI13510b
Doc ID 13277 Rev 4
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