HTRM800 Ver la hoja de datos (PDF) - Philips Electronics
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HTRM800 Datasheet PDF : 20 Pages
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Philips Semiconductors
HITAG long range reader module
hardware
Product specification
HTRM800 family
10.4 Possible sources of errors by connecting the
HTRM800
The following error list should be checked if any error
(e.g. read or write distances that do not reach the specified
values) occurs:
• Power supply cable not mounted correctly
• Power supply voltage not in the specified range
• Serial interface not connected correctly
• Interference received by the antenna because of an
external noise source (e.g. monitor, keyboards); the
remedial measure is to remove the antenna from the
interfering area and use the command StartFFT
• Connecting cables of the antenna changed by mistake
• Antenna is mounted in metal environment; the remedial
measure is to mount a non-metal space keeper between
the antenna and the metal
• Antenna is not designed following the antenna design
instructions
• Inductance of the antenna is not in the specified range
• Quality factor of the antenna is not in the specified
range.
10.5 Building HITAG long range antennas
10.5.1 BASICS
The exact way how to design a HITAG long range antenna
is described in application note “Antenna Design for the
HITAG Long Range System”.
The antenna is an important part of the HITAG long range
system. The antenna must provide energy and data
transmission between the reader module and transponder.
Therefore, you should be particularly careful when
implementing the antenna in order to achieve optimum
results.
The equivalent circuit of the antenna is shown in Fig.6.
The requirements of the antenna coil are:
• Quality factor: Q = 30 to 60
Q = R-X----ss- where
Xs = effective series reactance
Rs = effective series resistance
• Inductance: L = 400 to 1200 µH.
handbook, full pagewidth
VOLTAGE
LIMITER
HTRM800
coax cable
Vo
antenna
C
Rs
Xs
MGU421
Fig.6 Basics of the long range antenna.
2001 Oct 04
13
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