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)： 100/116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
100 of 116
NXP Semiconductors
MFRC531
ISO/IEC 14443 reader IC
15.1.2.3
Receiver circuit
The internal receiver of the MFRC531 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, 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.
15.1.2.4
Antenna coil
The precise calculation of the antenna coil’s inductance is not practicable but the
inductance can be estimated using
Equation 10
. We recommend designing an antenna
that is either circular or rectangular.
(10)
l
1
= length of one turn of the conductor loop
D
1
= diameter of the wire or width of the PCB conductor, respectively
K = antenna shape factor (K = 1.07 for circular antennas and K = 1.47 for square
antennas)
N
1
= number of turns
ln = natural logarithm function
The values of the antenna inductance, resistance, and capacitance at 13.56 MHz depend
on various parameters such as:
antenna construction (type of PCB)
thickness of conductor
distance between the windings
shielding layer
metal or ferrite nearby in the environment
Therefore, a measurement of these parameters under real life conditions or at least a
rough measurement and a tuning procedure is highly recommended to guarantee a
reasonable performance. 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.
L
1
nH
[
]
2
=
I
1
cm
[
]
I
1
D
1
------
ln
K
–
N
1
1.8
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