HTMS1301FTKSLASHAF datasheet(10/44 Pages) NXP

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184430

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Product data sheet

PUBLIC

Rev. 3.0 — 18 March 2010

184430

10 of 44

NXP Semiconductors

HITAG µ

ISO 18000 transponder IC

10.1.2 Data rate and data coding

The RWD to HITAG µ ISO 18000 transponder IC communication uses Pulse Interval

Encoding. The RWD creates pulses by switching the carrier off as described in Figure 4.

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 (1/125kHz = 8 μs nominal)

Fig 4.

Reader to HITAG µ ISO 18000 transponder IC: Pulse Interval Encoding

Table 6.

Data coding times [1]

Meaning

Symbol

Min

Max

Carrier off time

TF1

× Tc

Data “0” time

TFd0

× Tc

Data “1” time

TFd1

× Tc

Code violation time

TFcv

× Tc

Stop condition time

TFsc

≥ 42 × Tc

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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