HTMS8301FUGSLASHAM datasheet(15/44 Pages) NXP

15 / 44 page

184430

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Product data sheet

PUBLIC

Rev. 3.0 — 18 March 2010

184430

15 of 44

NXP Semiconductors

HITAG µ

ISO 18000 transponder IC

11.2 RWD waiting time before sending a subsequent request

• When the RWD has received a HITAG µ ISO 18000 response to a previous request

other than inventory or quiet, it needs to wait TFp2 before sending a subsequent

request. TFp2 starts from the time the last bit has been received from the HITAG µ

ISO 18000.

• When the RWD has sent a quiet request, it needs to wait TFp2 before sending a

subsequent request. TFp2 starts from the end of the quiet request's EOF (falling edge

of EOF pulse + 42

× TC). This results in a waiting time of (150 × TC + 42 × TC) before

the next request.

The minimum value of TFp2 is TFp2min = 150 × TC ensures that the HITAG µ ISO 18000 ICs

are ready to receive a subsequent request.

Remark: The RWD needs to wait at least 2.5 ms after it has activated the electromagnetic

field before sending the first request, to ensure that the HITAG µ ISO 18000 transponder

ICs are ready to receive a request.

• When the RWD has sent an inventory request, it is in an inventory process.

11.3 RWD waiting time before switching to next inventory slot

An inventory process is started when the RWD sends an inventory request. For a detailed

explanation of the inventory process refer to Section 14.3 and Section 14.4.

To switch to the next slot, the RWD sends an EOF after waiting a time period specified in

the following sub-clauses.

11.3.1 RWD started to receive one or more HITAG µ ISO 18000 transponder IC

responses

During an inventory process, when the RWD has started to receive one or more HITAG µ

a ISO 18000 transponder IC responses (i.e. it has detected a transponder IC SOF and/or

a collision), it shall

• wait for the complete reception of the HITAG µ ISO 18000 transponder IC responses

(i.e. when a last bit has been received or when the nominal response time TNRT has

elapsed),

• wait an additional time TFp2 and then send an EOF to switch to the next slot, if a 16

slot anticollision request is processed, or send a subsequent request (which could be

again an inventory request).

TFp2 starts from the time the last bit has been received from the HITAG µ ISO 18000

transponder IC.

The minimum value of TFp2 is TFp2min = 150 × TC.

TNRT is dependant on the anticollisions current mask value and on the setting of the CRCT

flag.

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