HTMS8201FTK datasheet(14/57 Pages) NXP

14 / 57 page

HTMS1x01_8x01

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Product data sheet

COMPANY PUBLIC

Rev. 3.3 — 17 October 2014

152933

14 of 57

NXP Semiconductors

HTMS1x01; HTMS8x01

HITAG µ transponder IC

10. General requirements

The HITAG

 transponder ICs are compatible with ISO 11785. At the time a HITAG 

transponder IC is in the interrogator field it will respond according to ISO 11785.

A HITAG

 advanced/advanced+ can be identified as a transponder being in the data

exchange mode (advanced mode) by the type information in the reserved bit field sent to

the RWD.

• Bit 15 of the ISO 11784 frame shall be set to ’1’ indicating that this is an HITAG µ

advanced/advanced+ in data exchange mode.

• Bit 16 of the ISO 11784 frame (additional data flag set to ’1’, indicating that the

HITAG µ advanced/advanced+ in data exchange mode contains additional data in the

user memory area.

To bring the HITAG µ transponder ICs into the data exchange mode, the RWD needs to

send a valid request or a valid switch command within the defined listening window.

A HITAG µ transponder IC in data exchange mode only responds when requested by the

RWD (RTF mode).

The identification code, all communication from reader to HITAG µ transponder ICs and

vice versa and the CRC error detection bits (if applicable) are transmitted starting with

LSB first.

In the case that multiple HITAG µ advanced/advanced+ in data exchange mode are in the

interrogation field which cause collisions the RWD has to start the anticollision procedure

as described in this document. Depending in which part of the ISO 11785 timing frame the

collision is detected the RWD will start with the anticollision request.

The HITAG

 transponder IC in data exchange mode switches back to the standard

ISO 11785 mode when it :

• is no longer in the interrogation field

• has terminated the data exchange mode operations and the interrogation field was

switched off for at least 5 ms afterwards

11. HITAG

 transponder IC air interface

11.1 Downlink description

To transfer the HITAG µ transponder ICs into the data exchange mode, the RWD's

interrogation field needs be switched off. After this off-period, the interrogation field is

switched on again, and either the SOF at the start of a valid request or the special switch

command needs to be sent to the HITAG µ transponder IC within the specified switch time

window. The HITAG µ transponder IC switches itself into the data exchange mode upon

reception of any of the switch commands. In this mode, the HITAG µ transponder IC

respond when requested by the RWD (reader driven protocol).

The HITAG µ transponder IC in data exchange mode switches back to the ISO 11785

mode after the interrogation field has been switched off for at least 5 ms.

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