SRI2K datasheet(25/45 Pages) STMICROELECTRONICS

25 / 45 page

SRI2K

Anticollision

Doc ID 15779 Rev 3

25/45

Figure 22.

Example of an anticollision sequence

Command

Tag 1

Chip_ID

Tag 2

Chip_ID

Tag 3

Chip_ID

Tag 4

Chip_ID

Tag 5

Chip_ID

Tag 6

Chip_ID

Tag 7

Chip_ID

Tag 8

Chip_ID

Comments

READY State

28h

75h

40h

01h

02h

FEh

A9h

7Ch

Each tag gets a random Chip_ID

INITIATE ()

40h

13h

3Fh

4Ah

50h

48h

52h

7Ch

Each tag get a new random Chip_ID.

All tags answer: collisions

45h

12h

30h

43h

55h

43h

53h

73h

All CHIP_SLOT_NUMBERs get

a new random value

PCALL16()

30h

Slot0: only one answer

30h

Tag3 is identified

SELECT(30h)

SLOT_MARKER(1)

Slot1: no answer

SLOT_MARKER(2)

Slot2: only one answer

12h

Tag2 is identified

SELECT(12h)

SLOT_MARKER(3)

Slot3: collisions

SLOT_MARKER(4)

Slot4: no answer

43h

53h

73h

SLOT_MARKER(5)

Slot5: collisions

SLOT_MARKER(6)

Slot6: no answer

45h

55h

SLOT_MARKER(N)

SlotN: no answer

SLOT_MARKER(F)

SlotF: no answer

40h

41h

53h

42h

50h

74h

All CHIP_SLOT_NUMBERs get

a new random value

PCALL16()

40h

Slot0: collisions

SLOT_MARKER(1)

Slot1: only one answer

SLOT_MARKER(2)

Slot2: only one answer

42h

Tag6 is identified

SELECT(42h)

SLOT_MARKER(3)

Slot3: only one answer

SELECT(53h)

Tag5 is identified

53h

SLOT_MARKER(4)

Slot4: only one answer

SELECT(74h)

Tag8 is identified

74h

SLOT_MARKER(N)

SlotN: no answer

50h

41h

Tag4 is identified

SELECT(41h)

41h

42h

53h

74h

41h

50h

All CHIP_SLOT_NUMBERs get

a new random value

PCALL16()

Slot0: only one answer

50h

Tag7 is identified

SELECT(50h)

SLOT_MARKER(1)

Slot1: only one answer but already

found for tag4

SLOT_MARKER(N)

SlotN: no answer

50h

41h

43h

All CHIP_SLOT_NUMBERs get

a new random value

PCALL16()

Slot0: only one answer

SLOT_MARKER(3)

Slot3: only one answer

43h

Tag1 is identified

SELECT(43h)

43h

All tags are identified

ai07669

SRI2K 数据表(PDF) 25 Page - STMicroelectronics

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