SL3ICS1002 datasheet(21/56 Pages) NXP

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139036

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Product data sheet

COMPANY PUBLIC

Rev. 3.6 — 10 March 2011

139036

21 of 56

NXP Semiconductors

SL3ICS1002/1202

UCODE G2XM and G2XL

13. Functional description

13.1 Power transfer

The interrogator provides an RF field that powers the tag, equipped with a UCODE G2X.

The antenna transforms the impedance of free space to the chip input impedance in order

to get the maximum possible power for the G2X on the tag.

The RF field, which is oscillating on the operating frequency provided by the interrogator,

is rectified to provide a smoothed DC voltage to the analog and digital modules of the IC.

The antenna that is attached to the chip may use a DC connection between the two

antenna pads. Therefore the G2X also enables loop antenna design. Possible examples

of supported antenna structures can be found in the reference antenna design guide.

13.2 Data transfer

13.2.1 Reader to G2X Link

An interrogator transmits information to the UCODE G2X by modulating an RF signal in

the 840 MHz - 960 MHz frequency range. The G2X receives both information and

operating energy from this RF signal. Tags are passive, meaning that they receive all of

their operating energy from the interrogator's RF waveform.

An interrogator is using a fixed modulation and data rate for the duration of at least an

inventory round. It communicates to the G2X by modulating an RF carrier using

DSB-ASK, SSB-ASK or PR-ASK with PIE encoding.

For further details refer to Section 18, Ref. 1, section 6.3.1.2. Interrogator-to-tag (R=>T)

communications.

13.2.2 G2X to reader Link

An interrogator receives information from the UCODE G2X by transmitting a

continuous-wave RF signal to the tag; the G2X responds by modulating the reflection

coefficient of its antenna, thereby generating modulated sidebands used to backscatter an

information signal to the interrogator. The system is a reader talks first (RTF) system,

meaning that a G2X modulates its antenna reflection coefficient with an information signal

only after being directed by the interrogator.

G2X backscatter is a combination of ASK and PSK modulation depending on the tuning

and bias point. The backscattered data is either modulated with FM0 baseband or Miller

sub carrier.

For further details refer to Section 18, Ref. 1, section 6.3.1.3. tag-to-interrogator (T=>R)

communications.

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