HTMS8201FTK datasheet(23/57 Pages) NXP

23 / 57 page

HTMS1x01_8x01

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Product data sheet

COMPANY PUBLIC

Rev. 3.3 — 17 October 2014

152933

23 of 57

NXP Semiconductors

HTMS1x01; HTMS8x01

HITAG µ transponder IC

12. 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 after 20 ms upon detection of the last falling edge of the interrogator request or

after the interrogator has switched off the field.

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

RWD

When the HITAG advanced/advanced+ in data exchange mode has detected an EOF of a

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

waits 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 transponder ICs is necessary to ensure the required synchronization of the HITAG µ

transponder IC responses.

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 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 13. 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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