XRA00 datasheet(6/40 Pages) STMICROELECTRONICS

6 / 40 page

XRA00

6/40

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

Figure 5. ASK Pulse Modulation Parameters

100%

UHF Envelope

> 0%

< 50%

ai10743

Low Level Interval

0.9 Modulation

0.5 Modulation

0.1 Modulation

fwhm

Ripple

100%

Time

Modulation

ai10744

Modulation

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