MB89R112 datasheet(19/49 Pages) RAMXEED

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MB89R112

DS411-00004-3v0-E

12. Timing definitions

(1) Period during which the MB89R112 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, MB89R112 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, and it is

defined as follows. The minimum value is 4320/fc (318.6 s), the nominal value is 4352/fc (320.9 s), and

the maximum value is 4384/fc (323.3 s).

Even if the 10 ASK modulated signal from the reader/writer is detected within the time t1_a, the transponder

ignore the signal and wait for further time t1_a before starting to transmit.

(2) Period during which the MB89R112 ignores modulated signals after an EOF signal transmitted

from the reader/writer : tmit

After detection of an EOF signal sent from the reader/writer, MB89R112 must ignore the 10 ASK modulated

signals from the reader/writer for a time (tmit).

tmit begins at the rising edge of the EOF pulse. The minimum value of tmit is defined as 4384/fc (323.3 s)



tnrt.

In the above expression, tnrt stands for the response time of MB89R112.

(3) Period during which the reader/writer waits before sending a request : t2_a

When the reader/writer has received a response from the transponder to a previous request other than

Inventory and Stay Quiet command, it shall wait a time t2_a before sending a subsequent request. The

minimum value of t2_a is 309.2 s. It is defined in ISO/IEC 15693-3. And ISO/IEC 18000-3 (Mode 1) .

(4) Period during which the reader/writer waits before sending a request during execution of the In-

ventory command : t2inv

While an Inventory command is being executed, the reader/writer sends an EOF signal when it shifts to the

nextslot. In this case, the wait time is defined as follows depending on whether transponders return responses :

- Wait time applied when the reader/writer has received one or more responses : t2invwr

It is defined in ISO/IEC 15693-3. And ISO/IEC 18000-3 (Mode 1) that when the reader/writer has received

one or more responses, the reader/writer must wait until responses from the transponders have been

completed (that is, the reader/writer receives an EOF signal or tnrt passes). After that, the reader/writer

must wait until t2_a passes before sending an EOF signal to switch to the next slot.

- Wait time applied when the reader/writer has not received any responses : t3_a

When the reader/writer has not received any responses from the MB89R112, the reader/writer must wait

until t3_a passes before sending an EOF signal. In this case, t3_a begins at the rising edge of the EOF

pulse that was sent previously. The minimum value of t3_a is defined as shown in the following table.

MB89R112 does not support the minimum value of t3_a as “4384/fc (323.3 s) + tsof” when the reader/

writer sends a 100% modulated EOF, which is defined in ISO/IEC 15693-3 and ISO/IEC 18000-3 (Mode 1).

(a) If the reader/writer sends a ASK10% modulated EOF, the minimum value of t3_a (ASK10%) is “4384/

fc (323.3 s  tnrt')

(b) If the reader/writer sends a ASK100% modulated EOF, the minimum value of t3_a (ASK100%) is

“4384/fc (323.3 s  tsof')

tnrt: The nominal response time of transponder

tsof: The time for transponder to transmit a SOF to the reader/writer

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