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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)： | 9/24頁 |
| 文件大?。?/td> | 112K |
| 代理商： | HTCM400 |
2001 Oct 04
9
Philips Semiconductors
Product specification
HITAG core module hardware
HTCM400
7.4.2
F
ILTERING OF THE SUPPLY VOLTAGES
The transmitter of the HTCM400 is supplied via pins AVDD and AGND. Disturbances on these supply pins are amplified
and may reduce the performance of the system. For that reason especially the analog supply voltage (pin AVDD) must
be filtered in addition to the common mode filtering described in Fig.5.
On the other hand the spurious emissions at the supply connections (pins DVDD and DGND) caused by the digital parts
of the module must be limited.
A suppressor diode protects the core module from ESD to the power supply line (see Fig.6).
7.4.3
F
ILTERING OF THE ANTENNA CIRCUIT
In case of using an external antenna with shielded antenna cable, no additional filtering should be necessary. In case of
a heavy disturbed environment, an additional filter circuit is recommended when using external antennas (see Fig.7).
Using this filter will reduce the reading performance by approximately 20%.
7.4.4
ESD
PROTECTION
All I/Os should be protected by common circuits consisting of series resistors and suppressor diodes. The transmitter
output is already protected by a series resistor and internal diodes of the driving FETs. To protect the receiver’s input, a
40 V bi-directional suppresser diode at pin TX1 is recommended. If the additional filter shown in Fig.7 is used, no more
protection circuits are needed.
handbook, full pagewidth
MGW327
100
nF
100
nF
100 nF
DVDD
AVDD
AGND,
DGND
22
μ
F
18 V
suppressor
VP
GND
10
μ
H
100
μ
H
10
μ
H
HTCM400
Fig.6 Power supply filtering.
handbook, halfpage
MGW328
2.2 k
10
k
1.68
nF
TX1
RX
GND
HTCM400
1
mH
Fig.7 Filtering of the antenna circuit.
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