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參數(shù)資料
| 型號： | HTCM400 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | HITAG core module hardware |
| 中文描述： | 此外，HITAG核心模塊的硬件 |
| 文件頁數(shù)： | 14/24頁 |
| 文件大小： | 112K |
| 代理商： | HTCM400 |
2001 Oct 04
14
Philips Semiconductors
Product specification
HITAG core module hardware
HTCM400
10.3.2
P
OWER SUPPLY
The HTCM400 requires a DC voltage of 5 V
±
5% and it is
absolutely necessary to use a low resistance (<0.7
)
power supply. Voltage regulation is required and separate
supplies for analog and digital parts are recommended.
See Section 8 for maximum allowed power supply ripple
amplitudes.
10.3.3
I
NTERFACE DRIVER
Signal transmission for direct connection to the host can
be done over the serial CMOS interface. For short
distances the transmission can be done over an RS232
interface, longer distances require integration of an RS485
or RS422 interface component. If you use an RS485
interface, pin TXDEN is used as control pin.
10.3.4
I/O
FUNCTIONS
If necessary, you can connect these inputs and outputs to
drivers for LEDs and switches.
10.4
To build a long range reader
handbook, full pagewidth
MGW331
serial interface
other 125 kHz
transponders
HITAG
CORE MODULE
HTCM400
RF PART
DSP
antenna
tags
Fig.11 Block diagram of long range reader module.
10.5
Possible sources of errors by connecting the
HTCM400
The following error list should be checked if any error (e.g.
read and write distances that do not reach the specified
values) occurs:
Power supply cable not mounted correctly
Bad filtering of the power supply; remedial measure:
filtering as described in Section 7.4.2
DC power supply not within the specified range
(V
P
= 5 V
±
5%)
RS232 interface not connected correctly
Interference received by the HTCM400 because of the
digital part of a possible additional circuit board.
Remedial measure: shielding of the additional circuit
board
Interference received by the HTCM400 because of an
external noise source. Remedial measure: housing of
metal or shielding
Interference received by the antenna because of an
external noise source (e.g. monitor or keys). Remedial
measure: removal of the antenna from the interfering
area
Connecting cables of the antenna changed by mistake
Antenna is mounted in metal environment. Remedial
measure: mount a non-metal space keeper between the
antenna and the metal
Antenna is not designed following the design
instructions of Section 11
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.
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