HTRM440 데이터 시트보기 (PDF) - Philips Electronics
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HTRM440 Datasheet PDF : 16 Pages
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Philips Semiconductors
HITAG proximity reader module
hardware
Product specification
HTRM440 family
10 APPLICATION INFORMATION
10.1 Metallic environment, interferences
The communication range is impaired by metallic
environment and electromagnetic interferences
(e.g. monitors and keyboards). Therefore, you should
keep a distance of at least the antenna’s diameter to
metallic surfaces or loops as well as to electromagnetic
interferences. If this is not possible, you have to take
preventive measures such as using ferrites or shielding for
transponder and antenna.
10.2 Distance between two antennas
In order to be able to operate two systems side by side
without negative influence on communication ranges, you
must place the antennas at a minimum distance of four
times the antenna diameter. If you place them at a closer
distance be sure to use suitable shielding or
synchronisation.
• 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
• 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 design
instructions
• Inductance of the antenna is too high
• Quality factor of the antenna is too high (Q > 40)
• Antenna current is too high
• Antenna voltage is too high.
10.3 Possible sources of errors by connecting the
HTRM440
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
• DC power supply voltage not in the specified range from
9 to 16 V
• Serial interface not connected correctly
11 SURVEY OF REFERENCED DOCUMENTS
CATEGORY
Data sheet
Application note
TITLE
“HTCM400, HTRM440 Family, HTRM800 Family Interface Protocol Reader - Host”
“HT1 (resp. HT2) Transponder family, reliability and integrity of data transmission”
2001 Oct 04
11
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