HTMS8301FUGSLASHAM datasheet(9/44 Pages) NXP

9 / 44 page

184430

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Product data sheet

PUBLIC

Rev. 3.0 — 18 March 2010

184430

9 of 44

NXP Semiconductors

HITAG µ

ISO 18000 transponder IC

10. HITAG

μ ISO 18000 transponder IC air interface

10.1 Downlink communication signal interface - RWD to HITAG

ISO 18000 transponder IC

10.1.1 Modulation parameters

Communications between RWD and HITAG µ ISO 18000 transponder IC takes place

using ASK modulation with a modulation index of m > 90%.

[1]

TFd0 > TF1 + TF3 + 3 × Tc

[2]

TC...Carrier period time (1/125kHz = 8 μs nominal)

Fig 3.

Modulation details of data transmission from RWD to HITAG µ transponder IC

Table 5.

Modulation coding times[1][2]

Symbol

Min

Max

m = (a-b)/(a+b)

90%

100%

TF1

× Tc

TF2

00.5

× TF1

TF3

00.5

× TFd0

0.05

× a

0.05

× a

001aaj826

TF2

TF1

TF3

envelope of transceiver field

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