HTMS8201FTK datasheet(29/57 Pages) NXP

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HTMS1x01_8x01

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Product data sheet

COMPANY PUBLIC

Rev. 3.3 — 17 October 2014

152933

29 of 57

NXP Semiconductors

HTMS1x01; HTMS8x01

HITAG µ transponder IC

13.4 Modes

13.4.1 ISO 11785 Mode

This mode is also named TTF (Transponder Talks First).

Every time a transponder IC is activated by the field it starts executing this mode. After

waiting the maximum listening window time (see Section 11.2) the transponder IC sends

continuously its TTF data (128-bit).

The TTF data stored in the memory will be not checked for ISO compliance, therefore

data will be sent as stored in the EEPROM.

Receiving a valid command or a switch command within the listening window sets the

transponder IC into RTF (Reader Talks First) mode.

13.4.2 RTF Mode

In this mode the transponder IC reacts only to RWD request commands as presented in

Section 14. A valid request consists of a command sent to the transponder IC being in

matching state (therefore see tables in Section 14 and transponder ICs state machine in

Section 13).

13.4.3 Anticollision

The RWD is the master of the communication with one or multiple transponder ICs. It

starts the anticollision sequence by issuing the inventory request (see Section 14.3).

Within the RWD command the NOS flag must be set to the desired setting (1 or 16 slots)

and add the mask length and the mask value after the command field.

The mask length n indicates the number of significant bits of the mask value. It can have

any value between 0 and 44 when 16 slots are used and any value between 0 and 48

when 1 slot is used.

The next two subsections summarize the actions done by the transponder IC during an

inventory round.

13.4.3.1

Anticollision with 1 slot

The transponder IC will receive one ore more inventory commands with NOS = '1'. Every

time the transponder ICs fractional or whole UID matches the mask value of RWD's

request it responses with remaining UID without mask value.

Transponder ICs responses are modulated by dual pattern data coding as described in

Section 11.4.

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