參數(shù)資料
型號(hào)： MFRC50001T
廠商： NXP Semiconductors N.V.
元件分類： 通信及網(wǎng)絡(luò)
英文描述： Highly integrated ISO-IEC 14443 A reader IC
封裝： MFRC50001T/0FE<SOT287-1 (SO32)|<<http://www.nxp.com/packages/SOT287-1.html<1<week 15, 2005,;
文件頁數(shù)： 92/110頁
文件大?。?/td> 841K
代理商： MFRC50001T
MFRC500_33
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2010. All rights reserved.
Product data sheet
PUBLIC
Rev. 3.3 — 15 March 2010
048033
92 of 110
NXP Semiconductors
MFRC500
Highly Integrated ISO/IEC 14443 A Reader IC
A multilayer board is recommended to implement a low-pass filter as shown in
Figure 22
.
The low-pass filter consists of the components L0 and C0. The recommended values are
given in Application notes
MICORE reader IC family; Directly Matched Antenna Design
Ref. 1
and
MIFARE (14443 A) 13.56 MHz RFID Proximity Antennas
Ref. 2
.
Remark:
To achieve best performance, all components must be at least equal in quality to
those recommended.
Remark:
The layout has a major influence on the overall performance of the filter.
15.1.2.2
Antenna matching
Due to the impedance transformation of the low-pass filter, the antenna coil has to be
matched to a given impedance. The matching elements C1 and C2 can be estimated and
have to be fine tuned depending on the design of the antenna coil.
The correct impedance matching is important to ensure optimum performance. The
overall quality factor has to be considered to guarantee a proper ISO/IEC 14443 A
communication scheme. Environmental influences have to considered and common EMC
design rules.
Refer to Application notes
MICORE reader IC family; Directly Matched Antenna Design
Ref. 1
and
MIFARE (14443 A) 13.56 MHz RFID Proximity Antennas
Ref. 2
for details.
Remark:
Do not exceed the current limits (I
DD(TVDD)
), otherwise the chip might be
destroyed.
Remark:
The overall 13.56 MHz RFID proximity antenna design in combination with the
MFRC500 IC does not require any specialist RF knowledge. However, all relevant
parameters have to be considered to guarantee optimum performance and international
EMC compliance.
15.1.2.3
Receiver circuit
The internal receiver of the MFRC500 makes use of both subcarrier load modulation
side-bands. No external filtering is required.
It is recommended to use the internally generated VMID potential as the input potential for
pin RX. This VMID DC voltage level has to be coupled to pin RX using resistor (R2). To
provide a stable DC reference voltage, a capacitor (C4) must be connected between
VMID and ground.
The AC voltage divider of R1 + C3 and R2 has to be designed taking in to account the AC
voltage limits on pin RX. Depending on the antenna coil design and the impedance,
matching the voltage at the antenna coil will differ. Therefore the recommended way to
design the receiver circuit is to use the given values for R1, R2, and C3; refer to
Application note;
MIFARE (14443 A) 13.56 MHz RFID Proximity Antennas
Ref. 2
. The
voltage on pin RX can be altered by varying R1 within the given limits.
Remark:
R2 is AC connected to ground using C4.
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