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Product data sheet
COMPANY PUBLIC
Rev. 3.4 — 21 May 2015
152934 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/T
Fd
Differential bi-phase coded data signal in the ISO 11785 mode, without SOF and
EOF
• 1/T
Fd
Manchester coded data signal on the response to the HITAG µ
advanced/advanced+ commands in data exchange mode
• 1/(2 T
Fd
) dual pattern data coding when responding within the inventory process
• TTF mode (not ISO 11785 compliant): 1/(2 T
Fd
), 2/T
Fd
Manchester or bi-phase
coded
T
Fd
= 32 / f
c
= 32 T
c
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
T
Fd
load offdata "0"
load on
T
Fd
T
Fd
load off
load on
T
Fd
load offdata "1"
load on
T
Fd
load off
load on
T
Fd
response encoding in
INVENTORY mode
response encoding to a RWD
request in data exchange mode
data
element
001aaj831
data
Bi-phase
10 1 1
1100
