HTMS8201FTK datasheet(19/57 Pages) NXP

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HTMS1x01_8x01

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Product data sheet

COMPANY PUBLIC

Rev. 3.3 — 17 October 2014

152933

19 of 57

NXP Semiconductors

HTMS1x01; HTMS8x01

HITAG µ transponder IC

11.3.2 Data rate and data coding

The RWD to HITAG µ transponder IC communication uses Pulse Interval Encoding. The

RWD creates pulses by switching the carrier off as described in Figure 7. The time

between the falling edges of the pulses determines either the value of the data bit ’0’, the

data bit ’1’, a code violation or a stop condition.

Assuming equal distributed data bits ’0’ and ’1’, the data rate is in the range of about

5.2 kbit/s.

[1]

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

Fig 7.

Reader to HITAG µ transponder IC: Pulse Interval Encoding

Table 12.

Data coding times [1]

Meaning

Symbol

Min

Max

Carrier off time

TF1

 T

Data “0” time

TFd0

 T

Data “1” time

TFd1

 T

Code violation time

TFcv

 T

Stop condition time

TFsc

 42  T

n/a

001aaj827

carrier on

TF1

carrier off

TFsc

"stop condition''

carrier on

TF1

carrier off

TF1

TFcv

"code violation''

carrier on

TF1

carrier off

TF1

TFd1

data "1''

carrier on

TF1

carrier off

TF1

TFd0

data "0''

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