參數(shù)資料
型號： MFRC53101T
廠商： NXP Semiconductors N.V.
元件分類： 通信及網(wǎng)絡(luò)
英文描述： ISO-IEC 14443 reader IC
封裝： MFRC53101T/0FE<SOT287-1 (SO32)|<<http://www.nxp.com/packages/SOT287-1.html<1<week 51, 2004,;MFRC53101T/0FE<SOT287-1 (SO32)|<<http://www.nxp.com/packages/SOT287-1.html<
文件頁數(shù)： 99/116頁
文件大?。?/td> 862K
代理商： MFRC53101T
MFRC531_34
NXP B.V. 2010. All rights reserved.
Product data sheet
PUBLIC
Rev. 3.4 — 26 January 2010
056634
99 of 116
NXP Semiconductors
MFRC531
ISO/IEC 14443 reader IC
15.1.2
Circuit description
The matching circuit consists of an EMC low-pass filter (L0 and C0), matching circuitry
(C1 and C2n), a receiver circuit (R1, R2, C3 and C4) and the antenna itself.
Refer to the following application notes for more detailed information about designing and
tuning an antenna.
MICORE reader IC family; Directly Matched Antenna Design
Ref. 1
MIFARE (14443 A) 13.56 MHz RFID Proximity Antennas
Ref. 2
.
15.1.2.1
EMC low-pass filter
The MIFARE system operates at a frequency of 13.56 MHz. This frequency is generated
by a quartz oscillator to clock the MFRC531. It is also the basis for driving the antenna
using the 13.56 MHz energy carrier. This not only causes power emissions at 13.56 MHz,
it also emits power at higher harmonics. International EMC regulations define the
amplitude of the emitted power over a broad frequency range. To meet these regulations,
appropriate filtering of the output signal is required.
A multilayer board is recommended to implement a low-pass filter as shown in
Figure 24
.
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 C2n 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 and
ISO/IEC 14443 B communication schemes. 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
MFRC531 IC does not require any specialist RF knowledge. However, all relevant
parameters have to be considered to guarantee optimum performance and international
EMC compliance.
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參數(shù)描述
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MFRC53101T/0FE112 制造商:NXP Semiconductors 功能描述:IC RFID READER 13.56MHZ SOIC-32
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