SL3S1203_1213 All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2014. All rights reserved.
Product data sheet
COMPANY PUBLIC
Rev. 4.4 — 17 March 2014
178844 9 of 37
NXP Semiconductors
SL3S1203_1213
UCODE G2iL and G2iL+
The antenna that is attached to the chip may use a DC connection between the two
antenna pads. Therefore the G2iL also enables loop antenna design. Possible examples
of supported antenna structures can be found in the reference antenna design guide.
10.3 Data transfer
10.3.1 Reader to tag Link
An interrogator transmits information to the UCODE G2iL by modulating an UHF RF
signal. The G2iL 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. In order to further improve the read range the UCODE G2iL+ can be
externally supplied as well so the energy to operate the chip does not need to be
transmitted by the reader.
An interrogator is using a fixed modulation and data rate for the duration of at least one
inventory round. It communicates to the G2iL by modulating an RF carrier using DSB-ASK
with PIE encoding.
For further details refer to Section 16
, Ref. 1. Interrogator-to-tag (R=>T) communications.
10.3.2 Tag to reader Link
An interrogator receives information from a G2iL by transmitting an unmodulated RF
carrier and listening for a backscattered reply. The G2iL 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 16
, Ref. 1, chapter 6.3.1.3.
The UCODE G2iL communicates information by backscatter-modulating the amplitude
and/or phase of the RF carrier. Interrogators shall be capable of demodulating either
demodulation type.
The encoding format, selected in response to interrogator commands, is either FM0
baseband or Miller-modulated subcarrier.
10.4 G2iL and G2iL+ differences
The UCODE G2iL is tailored for application where mainly EPC or TID number space is
needed. The G2iL+ in addition provides functionality such as tag tamper alarm, external
supply operation to further boost read/write range (external supply mode), a Privacy mode
reducing the read range or I/O functionality (data transfer to externally connected devices)
required.
The following table provides an overview of G2iL, G2iL+ special features.
Table 6. Overview of G2iL and G2iL+ features
Features G2iL G2iL+
Read protection (bankwise) yes yes
PSF (Built-in
Product Status Flag) yes yes
Backscatter strength reduction yes yes
Real read range reduction yes yes
Digital switch / Digital input - yes
External supply mode - yes