XRA00 Datasheet, PDF (6/40 Pages) STMicroelectronics – UHF, EPCglobal, Contactless Memory IC 96 bit ePC with Inventory and Kill Function

XRA00
DATA TRANSFER
Input Data Transfer from the Reader to the
XRA00 (Request Frame)
The RF Interface and Voltage Multiplier convert
the RF energy into the DC power required for the
XRA00 to operate. It provides modulation informa-
tion to the ASK demodulator which discriminates
between High and Low digital levels and forwards
this discriminated signal to the State Logic for Data
Recovery (see Figure 4.).
Within the State Logic, the Data Recovery and
Timing Block recovers the data from the de-modu-
lated signals and generates commands and con-
trol functions that coordinate all of the XRA00
operations. The State Logic interprets the Request
Frame, performs the required internal operations
and determines if a response is required. The
State Logic implements the State Diagram and
Communications Protocols.
The Reader-to-XRA00 link makes use of Ampli-
tude Shift Keying (ASK) with a maximum modula-
tion depth of 100% (see Figure 5.). Because of the
local UHF frequency regulation, the shape, depth
and rate of the modulation are variable within the
limits described in Table 2. The XRA00 adjusts its
timing over a range of modulation rates to lock to
Reader transmissions automatically.
Figure 4. ASK Modulation of the Received Wave
UHF Envelope
100%
Low Level Interval
> 0%
< _50%
< _50%
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Figure 5. ASK Pulse Modulation Parameters
Modulation
0%
0.9 Modulation
Ripple
0.5 Modulation
tfwhm
Modulation
100%
0.1 Modulation
tf
tr
Time
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