HTMS8201FTK datasheet(30/57 Pages) NXP

30 / 57 page

HTMS1x01_8x01

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Product data sheet

COMPANY PUBLIC

Rev. 3.3 — 17 October 2014

152933

30 of 57

NXP Semiconductors

HTMS1x01; HTMS8x01

HITAG µ transponder IC

13.4.3.2

Anticollision with 16 slots

The transponder IC will receive several inventory commands with NOS = '0' defining an

amount of 16 slots. Within the request there is the mask specified by length and value

(sent LSB first).

In case of mask length = '0' the four least significant bits of transponder ICs UID become

the starting value of transponder IC's slot counter.

In case of mask length

 '0' the received fractional mask is compared to transponder IC's

UID. If it matches the starting value for transponder IC's slot number will be calculated.

Starting at last significant bit of the sent mask the next four less significant bits of UID are

used for this value. At the same time transponder IC's slot counter is reset to '0'.

Now the RWD begins its anticollision algorithm. Every time the transponder IC receives an

EOF it increments slot-counter. Now if mask value and slot-counter value are matching

the transponder IC responses with the remaining UID without mask value but with slot

number

In case of collision within one slot the RWD changes the mask value and starts again

running its algorithm.

HTMS8201FTK Datasheet(PDF) 30 Page - NXP Semiconductors