HTMS1x01_8x01 All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2015. All rights reserved.
Product data sheet
COMPANY PUBLIC
Rev. 3.4 — 21 May 2015
152934 16 of 57
NXP Semiconductors
HTMS1x01; HTMS8x01
HITAG µ transponder IC
11.2 Mode switching protocol
After powering the HITAG µ transponder IC switches to the data exchange mode after
receiving one of the two possible switch commands from the RWD during the specified
switch window (see Table 10
and Figure 4 for details).
[1] T
C...
Carrier period time (
kHz = 7.45 s nominal)
Fig 4. Switching window timing
Table 10. HITAG µ transponder IC air interface parameters
[1]
Parameter Description
Interrogation field modulation Amplitude modulation (ASK), 90 - 100%
Encoding Pulse Interval Encoding; Least Significant Bit (LSB) first
Bit rate 5.2 kbit/s typically
Mode switching Either a specific 5 bit switch command or the detection of the
SOF as part of a valid
HITAG µ transponder IC command,
transmitted after the interruption of the interrogation field for at
least 5 ms
Mode switch timing
HITAG µ transponder IC settling time: 312.5 T
C
switch
command window after HITAG µ transponder IC settling:
232.5 T
C
All within cycle C in Figure 3.
Mode switch command 00011 or SOF sequence
001aak278
312.5 × T
c
232 × T
c
TTF operation in case
of no command
during switching window
