HTMS8x01 datasheet(16/57 Pages) NXP

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HTMS1x01_8x01

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Product data sheet

COMPANY PUBLIC

Rev. 3.3 — 17 October 2014

152933

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 9 and Figure 4 for details).

[1]

TC...Carrier period time (kHz = 7.45 s nominal)

Fig 4.

Switching window timing

Table 9.

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  TC switch

command window after

HITAG µ transponder IC settling:

232.5

 T

All within cycle C in Figure 3.

Mode switch command

00011 or SOF sequence

001aak278

312.5

× Tc

232

× Tc

TTF operation in case

of no command

during switching window

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