ISO15693 datasheet(21/45 Pages) FUJITSU

21 / 45 page

MB89R118

• Timing definitions

• Period during which the transponder waits for the start of response transmission after an EOF signal transmitted

from the reader/writer : t1_a

After detection of an EOF signal sent from the reader/writer, each transponder must wait for a certain time (t1_a)

before sending a response to the reader/writer. t1_a begins at the rising edge of the EOF pulse. The following

table lists the defined minimum, nominal, and maximum values of t1_a.

Also, ISO/IEC 15693-3 specifies that if the transponder detects a modulated signal from the reader/writer within

t1_a, the transponder must reset the t1_a timer and wait for another t1_a period before sending a response to

the reader/writer; otherwise, the slot counter must be incremented. On the MB89R118, however, the transponder

ignores all modulated signals sent from the reader/writer during the following tmit.

t1_a

SOF

EOF

t1_a

t2_a

t3_a

EOF

SOF

t1_a

tnrt

Reader/

writer

Transponder

Timing

Status

Slot 0

Slot 1

Slot 2

Inventory

request

Response 1

Response 2

Response 3

No collision

Collision

No response

Reader/

writer

Transponder

Slot 3

Request

Response 5

Response

Response 4

Timing

Status

Collision

• Example of Anti-Collision Sequence

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