RI-ACC-ATI2 Datasheet by Texas Instruments

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{5‘ TEXAS INSTRUMENTS
Antenna Tuning IndicatorRI-ACC-ATI2
Reference Guide
May 2001
SCBU031
‘9 TEXAS INSTRUMENTS
Antenna Tuning Indicator
RI-ACC-ATI2
Reference Guide
Literature Number: SCBU031
May 2001
Contents
Preface ............................................................................................................................... 5
1 Introduction ............................................................................................................... 7
1.1 Product Description ................................................................................................. 8
2 Operating Instructions ................................................................................................ 9
2.1 How to Connect the Antenna Tuning Indicator to the RF Module .......................................... 10
2.2 Tuning the Antenna to Resonance .............................................................................. 10
2.3 Adjusting the RXSS Threshold Level ........................................................................... 12
2.4 How to Disconnect the Antenna Tuning Indicator ............................................................. 12
SCBU031 – May 2001 Contents 3
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List of Figures
2-1 Top View of the ATI Connected to the RFM ............................................................................ 11
4List of Figures SCBU031 – May 2001
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{5‘ TEXAS INSTRUMENTS
Preface
SCBU031 – May 2001
Read This First
Edition One - May 2001
This is the first edition of this manual, it describes the following equipment:
TIRIS Antenna Tuning Indicator RI-ACC-ATI2
Texas Instruments (TI) reserves the right to make changes to its products or services or to discontinueany product or service at any time without notice. TI provides customer assistance in various technicalareas, but does not have full access to data concerning the use and applications of customer's products.
Therefore, TI assumes no liability and is not responsible for customer applications or product or softwaredesign or performance relating to systems or applications incorporating TI products. In addition, TIassumes no liability and is not responsible for infringement of patents and/or any other intellectual orindustrial property rights of third parties, which may result from assistance provided by TI.
TI products are not designed, intended, authorized or warranted to be suitable for life support applicationsor any other life critical applications which could involve potential risk of death, personal injury or severeproperty or environmental damage.
The TIRIS and TI-RFid logos, the words TIRIS, TI-RFid and Tag-it are trademarks or registeredtrademarks of Texas Instruments Incorporated.
Copyright © 2001 Texas Instruments Incorporated (TI)
This document may be downloaded onto a computer, stored and duplicated as necessary to support theuse of the related TI products. Any other type of duplication, circulation or storage on data carriers in anymanner not authorized by TI represents a violation of the applicable copyright laws and shall beprosecuted.
About This Guide
This manual describes the TIRIS Antenna Tuning Indicator (ATI), it provides the information that you willneed in order to use the ATI to help tune your antenna and reader system to resonance. It is generallytargeted at systems integrators or value added resellers.
SCBU031 – May 2001 Read This First 5
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Conventions
Conventions
WARNING
A WARNING IS USED WHERE CARE MUST BE TAKEN, OR ACERTAIN PROCEDURE MUST BE FOLLOWED IN ORDER TOPREVENT INJURY OR HARM TO YOUR HEALTH.
CAUTION
This indicates information on conditions which must be met, or a procedurewhich must be followed, which if not heeded could cause permanent damage tothe equipment or software.
Note: Indicates conditions which must be met, or procedures which must be followed, to ensureproper functioning of the equipment or software.
Indicates information which makes usage of the equipment or software easier
If You Need Assistance
Application Centers are located in Europe, North and South America and the Far East to provide directsupport. For more information, please contact your nearest TIRIS Sales and Application Center. Thecontact addresses can be found on our home page: http://www.ti-rfid.com
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Chapter 1SCBU031 – May 2001
Introduction
This document describes how to use the TIRIS Antenna Tuning Indicator (ATI)RI-ACC-ATI2 to tune antennas connected to a TIRIS Radio Frequency Module (RFM)RI-RFM-007B or RI-RFM-104B to resonance.
Topic .................................................................................................. Page
1.1 Product Description .................................................................... 8
SCBU031 – May 2001 Introduction 7
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1.1 Product Description
Product Description
The Antenna Tuning Indicator is a tool which simplifies the resonance tuning of the antenna (Section 2.2)and the adjustment of the RXSS- (Section 2.3) synchronization level for wireless read cyclesynchronization. It indicates exactly what to do during the antenna tuning procedure. In addition to that,the output of the RF Module field strength detector is indicated (RXSS-level) for EMI control.
8Introduction SCBU031 – May 2001
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Chapter 2SCBU031 – May 2001
Operating Instructions
Topic .................................................................................................. Page
2.1 How to Connect the Antenna Tuning Indicator to the RF Module .... 10
2.2 Tuning the Antenna to Resonance .............................................. 10
2.3 Adjusting the RXSS Threshold Level ........................................... 12
2.4 How to Disconnect the Antenna Tuning Indicator ......................... 12
SCBU031 – May 2001 Operating Instructions 9
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2.1 How to Connect the Antenna Tuning Indicator to the RF Module
2.2 Tuning the Antenna to Resonance
How to Connect the Antenna Tuning Indicator to the RF Module
The ATI is connected directly to the RF Module via the ATI connector on the RF Module (see Figure 2-1 ).It does not need a separate power supply. It can be connected to the RF Module even if the module isalready connected to the Control board.
Note: Because the ATI overwrites the TXCT- signal generated by the Controller, transponderscannot be read as long as the ATI is connected to the RF Module.
Connect the ATI to the RFM as follows:
Switch the RF Module power supply off.
Connect the ATI to the RF Module as indicated in Figure 2-1 .
Switch the power supply on.
WARNING
CARE MUST BE TAKEN WHEN HANDLING THE RFM. THERE ISHIGH VOLTAGE ACROSS THE ANTENNA TERMINALS, AT THETUNING COIL AND AT SOME PARTS OF THE PRINTED-CIRCUITBOARD (PCB). THE HIGH VOLTAGE COULD BE HARMFUL TOYOUR HEALTH!
IF THE ANTENNA INSULATION IS DAMAGED IT SHOULD NOT BECONNECTED TO THE RFM.
The antenna is tuned by adjusting the resonance frequency of the antenna resonator circuit to 134.2 kHz.This can be done by changing the inductance of a tuning coil on the Radio Frequency Module(RI-RFM-007B or RI-RFM-104B), or by adjusting the capacitance of the resonance circuit on the RFM.Screwing the ferrite core of the coil in increases the inductance and screwing the core out decreases it.The LEDs on the ATI indicate whether you should screw the core in or out, or increase or decrease thecapacitance. The green LED indicates correct tuning.
10 Operating Instructions SCBU031 – May 2001
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OUT OK
IN
ANTENNA
TUNING
INDICATOR
Made in Germany
RXSS
SYNC LEVEL
R
ES
O
N
A
NC
E
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UN
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Antenna terminals
Tuning Coil
(use plastic screwdriver)
Connector for Antenna
Tuning Indicator (ATI)
Connector ST1
Potentiometer for
RXSS- threshold
level adjustment
RI-ACC-ATI2-00
Tuning the Antenna to Resonance
Figure 2-1. Top View of the ATI Connected to the RFM
Tune the antenna to resonance as follows:
Set the switch on the ATI to the position 'RESONANCE TUNING'. The RF Module will starttransmitting.
If the left LED (red) indicates 'OUT':
On the S2000 RFM - screw the ferrite core out (with the plastic screwdriver provided).
On the Power RFM - decrease the capacitance.
If the right LED (red) indicates 'IN':
On the S2000 RFM - screw the ferrite core in (with the plastic screwdriver provided).
On the Power RFM - increase the capacitance.
When the green LED indicates 'OK', the antenna is tuned to resonance.
==> The antenna tuning is complete.
SCBU031 – May 2001 Operating Instructions 11
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2.3 Adjusting the RXSS Threshold Level
2.4 How to Disconnect the Antenna Tuning Indicator
Adjusting the RXSS Threshold Level
In order for wireless read cycle synchronization to work correctly the RXSS- threshold level must beadjusted by means of the potentiometer built into the RFM. This potentiometer is located on the upper sideof the RFM, next to connector ST-1 on the S2000 RFM (see Figure 2-1 ), or next to J1 on the Power RFM.
To adjust the RXSS- threshold level, please proceed as described below.
CAUTION
Please be careful not to overwind the potentiometer at either of the end stops.
Adjustment of the RXSS- level must be done individually for each antenna and RF Module, according tothe following procedure:
Set the switch on the ATI to 'SYNC LEVEL'.
Turn the potentiometer fully counter-clockwise (left-hand stop).
Ensure that no other reading units are transmitting.
Eliminate noise sources as much as possible.
Monitor the RXSS- LED on the ATI.
Turn the potentiometer on the RF Module clockwise, until the RXSSLED is just statically off (using theplastic screwdriver provided with the RFM/Reader for this purpose).
Disconnect the ATI from the RFM as follows:
Switch the RF Module power supply off.
Disconnect the ATI.
Switch the power supply on again.
12 Operating Instructions SCBU031 – May 2001
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