參數(shù)資料
型號: 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): 29/110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
29 of 110
NXP Semiconductors
MFRC500
Highly Integrated 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 11
) 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)
10
11
35
22
12
13
23
14
50
36
15
0
0
2
1
0
0
1
0
3
2
0
10
11
3
6
12
13
7
14
2
4
15
0.1000
0.0909
0.0901
0.0870
0.0833
0.0769
0.0745
0.0714
0.0701
0.0676
0.0667
55
46
47
56
57
58
59
60
61
62
63
3
2
2
3
3
3
3
3
3
3
3
7
14
15
8
9
10
11
12
13
14
15
0.0200
0.0193
0.0180
0.0175
0.0156
0.0140
0.0127
0.0117
0.0108
0.0100
0.0093
Table 22.
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
+
=
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