manualshive.com logo in svg

Texas Instruments TIRIS RI-TRP-RRHP, Reference Manual

Share
Download
Texas Instruments TIRIS RI-TRP-RRHP Reference Manual Download Page 14

23 mm Transponder Reference Manual

         25 July 1996

Page 14 of 22

7.  Measurement Set-Ups

This Section describes typical measurement set-ups to determine transponder relevant data like:
resonant frequency, bandwidth, quality factor, powering field strength and transponder signal field
strength listed in Section 9 "Rocommended Operating Conditions".

7.1 Measurement Set-Up: Resonance frequency, bandwidth, quality factor of transponder

This test set-up is suitable for resonant frequency (fres) measurements as well as the determination
of the -3dB bandwidth (

∆

f) of the transponder.  The quality factor Q of the transponder resonance

circuit can be calculated with equation (1):

(1)

 

Q

f

f

res

=

∆

The wires of the pick-up coil should be very thin to avoid influence on the measurement results (for
example: by damping).  The choice of a 1 M

Ω

 input resistor at the spectrum analyzer is

recommended.  Figure 13 shows the test set-up.  The relation between pick-up coil voltage and
frequency is shown in Figure 14.

PICK-UP
   COIL 

SPECTRUM
 ANALYZER

 COIL

INPUT

TRACKING GENERATOR

      TRANSPONDER

Figure 13: Measurement set-up for the determination of transponder resonance frequency,

bandwidth and quality factor

Summary of Contents for TIRIS RI-TRP-RRHP

Page 1: ...Texas Instruments Registration and Identification System 23 mm Glass Encapsulated Transponder RI TRP RRHP RI TRP WRHP Reference Manual 11 09 21 023 25 July 1996 ...

Page 2: ...cations application and environmental related data Texas Instruments reserves the right to change its products or services at any time without notice TI provides customer assistance in various technical areas but does not have full access to data concerning the uses and applications of customer s products Therefore TI assumes no responsibility for customer product design or for infringement of pat...

Page 3: ...onfiguration Showing the Reader Antenna and Transponder 4 Figure 2 Block Diagram of the TIRIS Pulsed FM Transponder 4 Figure 3 Dimensions of the TIRIS 23 mm Transponder in mm 5 Figure 4 Charge and Read Function of the Transponder 6 Figure 5 FM Principle Used for the Read Function of TIRIS Transponders 7 Figure 6a Read Data Format of TIRIS RO Transponder 7 Figure 6b Read Data Format of TIRIS R W Tr...

Page 4: ...rsions use an 80 bit non volatile memory EEPROM for storage of 64 identification bits and a 16 bit Block Check Character BCC The RO type is factory programmed with a unique tamperproof code that cannot be altered The R W version can be programmed by the user The 23 mm Transponder comprises a ferrite core antenna a charge capacitor a resonance capacitor and the integrated circuit Figure 2 The anten...

Page 5: ...evice RI TRP RRHP 64 bit Read Write device RI TRP WRHP 4 Function The Pulsed FM System uses a sequential function principle separating the transponder powering charge and transponder data transmission mode The advantages of the sequential mode are described in Section 5 1 Basic System Data 4 1 Read Reading of RO and R W Transponders During the charge or powering phase of between 15 and 50 ms the i...

Page 6: ... ms The data format consists of 128 bits Different start stop bytes and end bits are used to allow secure distinction between RO and R W Transponder Figures 6a and 6b show the format of the received data for RO and R W transponders After transmission of the data format the capacitor is discharged The typical transponder readout timing is described in figure 4 The charge phase is followed directly ...

Page 7: ...on of TIRIS Transponders 16 8 64 112 bits 16 bits 8 16 15 BITS READ DATA IDENTIFICATION DATA DATA BCC END BITS DISCHARGE MSB LSB PRE STOP START Figure 6a Read Data Format of TIRIS RO Transponder 16 8 64 112 bits 16 bits 8 16 15 BITS READ DATA IDENTIFICATION DATA DATA BCC MSB LSB PRE STOP START IDENT DATA DISCHARGE ENDBITS Figure 6b Read Data Format of TIRIS R W Transponder ...

Page 8: ...eously into the EEPROM Once the data is programmed into the EEPROM the transponder automatically sends back the captured data to the reader to allow a security check this process takes place when the transmitter is switched off Each read unit can be used as a write unit through software change only No hardware changes are required Figure 7 describes the write function by showing the transmitter re...

Page 9: ... of the Pulsed FM System 5 1 Basic System Data The TIRIS Pulsed FM system multiplexes the power and read functions avoiding compromises This results in the following characteristics and options a Individual optimization of the power and read functions by the system designer b Variation of powering time by S W to trade off speed current consumption with other parameters c Absence of the high poweri...

Page 10: ...t AM noise suppression Low reader power dissipation because of low charge field strength Low power consumption due to pulsed operation low peak power x low duty cycle Data telegram transmission is secured by 16 bit CRC CCITT error detection protocol The receive time is short because the transponder protocol always starts at the beginning of the data stream Therefore read repetitions are not necess...

Page 11: ... noise types are present and potentially cause EMI problems Especially the increased application of electronics and communication systems in cars employing digital and ASK type modulation techniques can produce and emit high field strength levels The highest energy noise sources are in the low frequency part of the spectrum at frequencies from a few cycles up to a few kHz The sources are actuators...

Page 12: ...communication conditions Figure 12 shows the performance reading range under induced broad band noise white noise conditions Pulsed FM EMI System Performance 0 001 0 01 0 1 1 10 100 1 000 0 001 0 01 0 1 1 10 100 1 000 10 000 E M I FIELD STREN GTH VOLT S m FREQUENCY MHz LW SW MW FM VHF UHF Malfunction Function Function Figure 10 EMI Performance Test of the TIRIS System The graph shows the EM Immuni...

Page 13: ...Hz 900 MHz READING RANGE normalized Figure 11 EMI performance at commonly used radio communication frequencies in automotive environment White noise performance of TIRIS 20 25 30 35 40 45 50 55 60 65 0 10 20 30 40 50 60 70 80 90 100 NOISE LEVEL dBµΑ µΑ m READING RANGE AM Systems TIRIS Pulsed FM Figure 12 Reading range under broad band noise white noise conditions ...

Page 14: ...measurements as well as the determination of the 3dB bandwidth f of the transponder The quality factor Q of the transponder resonance circuit can be calculated with equation 1 1 Q f f res The wires of the pick up coil should be very thin to avoid influence on the measurement results for example by damping The choice of a 1 MΩ input resistor at the spectrum analyzer is recommended Figure 13 shows t...

Page 15: ...m required powering field strength ANTENNA AXIS PICK UP COIL SIGNAL GENERATOR d 2 d COILS OSCILLOSCOPE Trigger TRANSPONDER Figure 15 Test set up for powering field strength determination The field between both serial connected coils is homogeneous due to the fact that the aperture is built according to the Helmholtz set up The circular coils are positioned in parallel on one axis The distance betw...

Page 16: ...ltz set up can be used for the specification of transponders in the temperature range from 40 to 85 ºC Tests showed however that deviations of the field strength caused by temperature negligible The data telegram of the transponder can be captured by a pick up coil for example 10 windings thin wire to minimize influence which wraps the transponder The pulse modulated signal can be adjusted at the ...

Page 17: ...he transponder signal The field strength can be calculated by using the calibration factor of the field strength probe ANTENNA AXIS PICK UP COIL SIGNAL GENERATOR d COILS SPECTRUM ANALYZER TRANSPONDER Figure 17 Determination of the transponder signal strength data transmission signal strength with Helmholtz aperture P o w e r p h a s e R e a d p h a s e U t T r a n s p o n d e r s ig n a l P o w e ...

Page 18: ...harge time of 50 ms and a transmitter frequency of 134 2 kHz 40 Hz unless otherwise noted PARAMETER CONDITION MIN NOM MAX UNIT Charge duration for read and write texc 15 50 ms Charge frequency for read and write fexc 134 16 134 2 134 24 kHz Programming time tprog 15 ms Programming field strength Hprog texc 50 ms 142 5 dBµA m Programming field strength Hprog 25 oC texc 50 ms 138 5 dBµA m Activation...

Page 19: ...ansmit frequency fH 25 oC 121 0 122 9 125 0 kHz High bit duration tH 0 125 0 130 0 133 ms Transponder output field strength 5 cm Hout 80 101 dBµA m FSK Modulation index read fL fH mread 25 oC 11 kHz FSK Modulation index read fL fH mread Note 2 9 15 kHz Data transmission rate read rread 7 4 8 7 kbit s Data transmission time read tread 16 20 ms ASK modulation index write mwrite 100 Data transmission...

Page 20: ...Radiation immunity 1 512 MHz 100 V m EM Radiation immunity 512 1000MHz 50 V m ESD Immunity IEC 801 2 2 kV X ray dose 2000 RAD Vibration Note 2 IEC 68 2 6 Test Fc Shock IEC 68 2 27 Test Ea Note 1 Cumulative failure rate 1 Note 2 f 10 2000 Hz 12 Memory PARAMETER DATA Memory size 80 bits Memory organization 1 block Identification data 64 bit Error detection Data BCC CRC CCITT 16 bit 13 Package PARAME...

Page 21: ...mbolization The Transponders are packed in a a carrier tape which is closed with a cover tape carrying product information and Country of Origin information as below MALAYSIA xxxxxxxxxxxxxxxx Note XXXXXXXXXXXXXXXX is the 16 digits Identification Code ID in hexadecimal numbers ...

Page 22: ...ength and electric field strength B H E Z H F µ0 H E dB V m dB A m µ µ 515 H dB A m µ E dB V m µ B magnetic flux Tesla Wb m2 Vs m2 1 mWb m2 0 795 A m H magnetic field strength A m or in logarithmic term dBµA m E electrical field strength V m or in logarithmic term dBµV m µ0 magnetic field constant 1 257 10 6 Vs Am ZF free space impedance 120 π Ω 377 Ω ...

Reviews:

No comments

Brands by name

Popular brands

Load more brands