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參數(shù)資料
| 型號(hào)： | 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)： | 32/116頁 |
| 文件大?。?/td> | 862K |
| 代理商： | MFRC53101T |
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MFRC531_34
NXP B.V. 2010. All rights reserved.
Product data sheet
PUBLIC
Rev. 3.4 — 26 January 2010
056634
32 of 116
NXP Semiconductors
MFRC531
ISO/IEC 14443 reader IC
9.9.3.2
Calculating the relative source resistance
The reference source resistance R
S(ref)
can be calculated using
Equation 6
.
(6)
The reference source resistance (R
S(ref)
) during the modulation phase can be calculated
using ModConductance register’s GsCfgMod[5:0].
9.9.3.3
Calculating the effective source resistance
Wiring resistance (R
S(wire)
):
Wiring and bonding add a constant offset to the driver
resistance that is relevant when pins TX1 and TX2 are switched to low-impedance. The
additional resistance for pin TX1 (R
S(wire)TX1
) can be set approximately as shown in
Equation 7
.
(7)
Effective resistance (R
Sx
):
The source resistances of the driver transistors (RsMaxP
byte) read from the Product Information Field (see
Section 9.2.1 on page 13
) are
measured during the production test with CwConductance register’s
GsCfgCW[5:0] = 01h.
To calculate the driver resistance for a specific value set in GsCfgMod[5:0], use
Equation 8
.
(8)
9.9.4
Pulse width
The envelope carries the data signal information that is transmitted to the card. It is an
encoded data signal based on the Miller code. In addition, each pause of the Miller
encoded signal is again encoded as a pulse of a fixed width. The width of the pulse is
adjusted using the ModWidth register. The pulse width (t
w
) is calculated using
Equation 9
where the frequency constant (f
clk
) = 13.56 MHz.
(9)
9.10 Receiver circuitry
The MFRC531 uses an integrated quadrature demodulation circuit enabling it to detect an
ISO/IEC 14443 A or ISO/IEC 14443 B compliant subcarrier signal on pin RX.
ISO/IEC 14443 A subcarrier signal:
defined as a Manchester coded ASK modulated
signal
ISO/IEC 14443 B subcarrier signal:
defined as an NRZ-L coded BPSK modulated
ISO/IEC 14443 B subcarrier signal
R
S ref
)
MANT
GsCfgCW
40
-----
GsCfgCW
--------------------------------------------------------------------------------
=
R
S wire
)
TX1
500
m
Ω
≈
R
Sx
R
S ref
)
maxP
R
S wire
)
TX1
–
(
)
R
S rel
)
R
S wire
)
TX1
+
=
t
w
2ModWidth
1
+
f
c
=
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