SL3ICS1002 datasheet(25/56 Pages) NXP

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139036

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Product data sheet

COMPANY PUBLIC

Rev. 3.6 — 10 March 2011

139036

25 of 56

NXP Semiconductors

SL3ICS1002/1202

UCODE G2XM and G2XL

14.2 G2X to reader communication

An interrogator receives information from a G2X by transmitting an unmodulated RF

carrier and listening for a backscattered reply. The G2X backscatters by switching the

reflection coefficient of its antenna between two states in accordance with the data being

sent. For further details refer to Section 18, Ref. 1, chapter 6.3.1.3.

14.2.1 Modulation

The UCODE G2X communicates information by backscatter-modulating the amplitude

and/or phase of the RF carrier. Interrogators shall be capable of demodulating either

demodulation type.

14.2.2 Data encoding

The encoding format, selected in response to interrogator commands, is either FM0

baseband or Miller-modulated subaltern. The interrogator commands the encoding choice

14.2.2.1 FM0 baseband

FM0 inverts the baseband phase at every symbol boundary; a data-0 has an additional

mid-symbol phase inversion. For details on FM0 and generator state diagram, FM0

symbols and sequences and how FM0 transmissions should be terminated refer to

Section 18, Ref. 1, chapter 6.3.1.3.

14.2.2.2 FM0 Preamble

T=>R FM0 signaling begin with one of two defined preambles, depending on the value of

the TRext bit specified in the Query command that initiated the inventory round. For

further details refer to Section 18, Ref. 1, chapter 6.3.1.3.

14.2.2.3 Miller-modulated sub carrier

Baseband Miller inverts its phase between two data-0s in sequence. Baseband Miller also

places a phase inversion in the middle of a data-1 symbol. For details on Miller-modulated

sub carrier, generator state diagram, sub carrier sequences and terminating sub carrier

transmissions refer to Section 18, Ref. 1, chapter 6.3.1.3.

14.2.2.4 Miller sub carrier preamble

T=>R sub carrier signaling begins with one of the two defined preambles. The choice

depends on the value of the TRext bit specified in the Query command that initiated the

inventory round. For further details refer to Section 18, Ref. 1, chapter 6.3.1.3.

14.2.3 Data rates

The G2X IC supports tag to interrogator data rates and link frequencies as specified in

Section 18, Ref. 1, chapter 6.3.1.3.

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