sri512 STMicroelectronics, sri512 Datasheet - Page 27

• Manufacturer Part Number: sri512
• Description: 13.56-mhz Short-range Contactless Memory Chip With 512-bit Eeprom And Anti-collision Functions
• Manufacturer: STMicroelectronics

SRI512
Figure 22. Example of an anticollision sequence
Command
READY State
INITIATE ()
PCALL16()
SELECT(30h)
SLOT_MARKER(1)
SLOT_MARKER(2)
SELECT(12h)
SLOT_MARKER(3)
SLOT_MARKER(4)
SLOT_MARKER(5)
SLOT_MARKER(6)
SLOT_MARKER(N)
SLOT_MARKER(F)
PCALL16()
SLOT_MARKER(1)
SELECT(41h)
SLOT_MARKER(2)
SELECT(42h)
SLOT_MARKER(3)
SELECT(53h)
SLOT_MARKER(4)
SELECT(74h)
SLOT_MARKER(N)
PCALL16()
SELECT(50h)
SLOT_MARKER(1)
SLOT_MARKER(N)
PCALL16()
SLOT_MARKER(3)
SELECT(43h)
Chip_ID
Tag 1
45h
40h
28h
40h
45h
40h
41h
41h
43h
43h
43h
Chip_ID
Tag 2
12h
75h
13h
12h
12h
Chip_ID
Tag 3
40h
3Fh
30h
30h
30h
Chip_ID
Tag 4
01h
4Ah
43h
43h
41h
41h
41h
Chip_ID
Tag 5
02h
50h
55h
55h
53h
53h
53h
Chip_ID
Tag 6
FEh
48h
43h
43h
42h
42h
42h
Chip_ID
Tag 7
A9h
52h
53h
53h
50h
50h
50h
50h
50h
Chip_ID
Tag 8
7Ch
7Ch
73h
73h
74h
74h
74h
Comments
Each tag gets a random Chip_ID
Each tag get a new random Chip_ID
All tags answer: collisions
All CHIP_SLOT_NUMBERs get
a new random value
Slot0: only one answer
Tag3 is identified
Slot1: no answer
Slot2: only one answer
Tag2 is identified
Slot3: collisions
Slot4: no answer
Slot5: collisions
Slot6: no answer
SlotN: no answer
SlotF: no answer
All CHIP_SLOT_NUMBERs get
a new random value
Slot0: collisions
Slot1: only one answer
Tag4 is identified
Slot2: only one answer
Tag6 is identified
Slot3: only one answer
Tag5 is identified
Slot4: only one answer
Tag8 is identified
SlotN: no answer
All CHIP_SLOT_NUMBERs get
a new random value
Slot0: only one answer
Tag7 is identified
Slot1: only one answer but already
found for tag4
SlotN: no answer
All CHIP_SLOT_NUMBERs get
a new random value
Slot0: only one answer
Slot3: only one answer
Tag1 is identified
All tags are identified
Anticollision
ai07669
27/50