HTMS8301FUGSLASHAM datasheet(14/44 Pages) NXP

14 / 44 page

184430

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Product data sheet

PUBLIC

Rev. 3.0 — 18 March 2010

184430

14 of 44

NXP Semiconductors

HITAG µ

ISO 18000 transponder IC

11. General protocol timing specification

For requests where an EEPROM erase and/or programming operation is required, the

transponder IC returns its response when it has completed the write/lock operation. This

will be latest after 20 ms upon detection of the last falling edge of the RWD request or

after the RWD has switched off the field.

11.1 Waiting time before transmitting a response after an EOF from the

RWD

When the HITAG µ ISO 18000 transponder IC has detected an EOF of a valid RWD

request or when this EOF is in the normal sequence of a valid RWD request, it shall wait

for TFp1 before starting to transmit its response to a RWD request or when switching to the

next slot in an inventory process.

TFp1 starts from the detection of the falling edge of the EOF received from the RWD.

Remark: The synchronization on the falling edge from the RWD to the EOF of the HITAG

µ ISO 18000 transponder IC is necessary to ensure the required synchronization of the

response.

The minimum value of TFp1 is TFp1min = 204 × TC

The typical value of TFp1 is TFp1typ = 209 × TC

The maximum value of TFp1 is TFp1max = 213 × TC

If the HITAG µ ISO 18000 transponder IC detects a carrier modulation during this time

(TFp1), it shall reset its TFp1-timer and wait for a further time (TFp1) before starting to

transmit its response to a RWD request or to switch to the next slot when in an inventory

process.

Fig 9.

General protocol timing diagram

001aaj833

carrier on

request

response

request (or EOF)

carrier off

load off

load on

HITAG

transceiver

TNRT

TFp1

TFp2

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