HTMS8x01 datasheet(21/57 Pages) NXP

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HTMS1x01_8x01

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Product data sheet

COMPANY PUBLIC

Rev. 3.3 — 17 October 2014

152933

21 of 57

NXP Semiconductors

HTMS1x01; HTMS8x01

HITAG µ transponder IC

11.4 Communication signal interface - HITAG µ transponder IC to RWD

11.4.1 Data rate and data coding

The HITAG µ transponder IC accepts the following data rates and encoding schemes:

• 1/TFd Differential bi-phase coded data signal in the ISO 11785 mode, without SOF and

EOF

• 1/TFd Manchester coded data signal on the response to the HITAG µ

advanced/advanced+ commands in data exchange mode

• 1/(2 TFd) dual pattern data coding when responding within the inventory process

• TTF mode (not ISO 11785 compliant): 1/(2  TFd), 2/TFd Manchester or bi-phase

coded

TFd = 32 / fc = 32  Tc

Remark: The slower data rate used during the inventory process allows for improving the

collision detection when several HITAG µ transponder ICs are present in the RWD field,

especially if some HITAG µ transponder ICs are in the near field and others in the far field.

Differential Bi-phase (or FM0 respectively) contains a transition in the center of bit

conversion representing Data ’0’ and no one for Data ’1’. At the beginning of every bit

modulation a level transition must be performed.

Fig 10. HITAG µ transponder IC - Load modulation coding

Fig 11. HITAG µ transponder IC - Differential Bi-Phase Modulation

001aaj830

TFd

load off

data "0"

load on

TFd

load off

load on

TFd

load off

data "1"

load on

TFd

load off

load on

TFd

response encoding in

INVENTORY mode

response encoding to a RWD

request in data exchange mode

data

element

001aaj831

data

Bi-phase

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