參數(shù)資料
型號： MFRC53001T
廠商： NXP Semiconductors N.V.
元件分類： 通信及網(wǎng)絡(luò)
英文描述： ISO-IEC 14443 A Reader IC
封裝： MFRC53001T/0FE<SOT287-1 (SO32)|<<http://www.nxp.com/packages/SOT287-1.html<1<week 5, 2005,;MFRC53001T/0FE<SOT287-1 (SO32)|<<http://www.nxp.com/packages/SOT287-1.html<1
文件頁數(shù)： 30/115頁
文件大小： 2590K
代理商： MFRC53001T
MFRC530_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 — 6 July 2010
057433
30 of 115
NXP Semiconductors
MFRC530
ISO/IEC 14443 A 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)
23
14
50
36
15
1
0
3
2
0
7
0.0745
0.0714
0.0701
0.0676
0.0667
59
60
61
62
63
3
3
3
3
3
11
12
13
14
15
0.0127
0.0117
0.0108
0.0100
0.0093
14
2
4
15
Table 27.
MANT = Mantissa; EXP= Exponent.
GsCfgCW,
GsCfgMod
(decimal)
(decimal)
TX1 and TX2 source resistance of n-channel driver transistor against GsCfgCW or GsCfgMod
…continued
EXP
GsCfgCW
,
EXP
GsCfgMod
MANT
GsCfgCW
,
MANT
GsCfgMod
(decimal)
R
S(ref)
(
Ω
)
GsCfgCW,
GsCfgMod
(decimal)
EXP
GsCfgCW
,
EXP
GsCfgMod
(decimal)
MANT
GsCfgCW
,
MANT
GsCfgMod
(decimal)
R
S(ref)
(
Ω
)
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
clk
=
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