SR176_07 Datasheet, PDF (15/35 Pages) STMicroelectronics – 13.56 MHz, 176-bit short range contactless user EEPROM with 64-bit Unique ID

SR176
5.1
Device operations (instructions)
INITIATE()
Command Code = 06h,00h
Prior to any other command, the SR176 must be activated by an INITIATE command. All
other commands sent to the SR176 before the INITIATE are ignored. In response to
receiving the INITIATE command, the SR176 sends back its Chip_ID, using an 8-bit format
(Figure 17).
Upon receiving a valid INITIATE command, the SR176 switches to the ACTIVE state, where
it will not answer to any new INITIATE command. Once In the ACTIVE state, the SR176 will
remain in this state until it receives a valid SELECT command.
Request parameters (Figure 14):
● none
Response parameters (Figure 15):
● Chip_ID (formatted as shown in Figure 16)
Figure 14. INITIATE request format
SOF
INITIATE
06h
00h
Figure 15. INITIATE response format
CRCL
8 bits
CRCH
8 bits
EOF
AI07670B
SOF
Chip_ID
4 reserved bits
+ 4-bit ID
CRCL
8 bits
CRCH
8 bits
EOF
AI07701B
Figure 16. 8-bit Chip_ID format
b7
b6
b5
b4
Reserved bits (block 15)
b3
b2
b1
b3
Block 15
4-bit Chip_ID of the SR176
b0
b0
AI07700B
Figure 17. INITIATE frame exchange between Reader and SR176
Reader SOF 06h
SR176
00h CRCL CRCH EOF
t0
t1 _{SOF Chip_ID CRCL CRCH EOF}
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