參數(shù)資料
型號(hào)： MFRC50001T
廠商： NXP Semiconductors N.V.
元件分類(lèi)： 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(yè)數(shù)： 28/110頁(yè)
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
28 of 110
NXP Semiconductors
MFRC500
Highly Integrated ISO/IEC 14443 A Reader IC
9.9.2
Antenna operating distance versus power consumption
Using different antenna matching circuits (by varying the supply voltage on the antenna
driver supply pin TVDD), it is possible to find the trade-off between maximum effective
operating distance and power consumption. Different antenna matching circuits are
described in the Application note
“MIFARE Design of MFRC500 Matching Circuit and
Antennas”
.
9.9.3
Antenna driver output source resistance
The output source conductance of pins TX1 and TX2 can be adjusted between 1
Ω
and
100
Ω
using the CwConductance register GsCfgCW[5:0] bits.
The output source conductance of pins TX1 and TX2 during the modulation phase can be
adjusted between 1
Ω
and 100
Ω
using the ModConductance register GsCfgMod[5:0] bits.
The values are relative to the reference resistance (R
S(ref)
) which is measured during the
production test and stored in the MFRC500 EEPROM. It can be read from the product
information field (see
Section 9.2.1 on page 11
). The electrical specification can be found
in
Section 13.3.3 on page 86
.
9.9.3.1
Source resistance table
Table 22.
MANT = Mantissa; EXP= Exponent.
GsCfgCW,
GsCfgMod
(decimal)
(decimal)
0
16
32
48
1
17
2
3
33
18
4
5
19
6
7
49
34
20
8
9
21
TX1 and TX2 source resistance of n-channel driver transistor against GsCfgCW or GsCfgMod
EXP
GsCfgCW
,
EXP
GsCfgMod
MANT
GsCfgCW
,
MANT
GsCfgMod
(decimal)
0
0
0
0
1
1
2
3
1
2
4
5
3
6
7
1
2
4
8
9
5
R
S(ref)
(
Ω
)
GsCfgCW,
GsCfgMod
(decimal)
24
25
37
26
27
51
38
28
29
39
30
52
31
40
41
53
42
43
54
44
45
EXP
GsCfgCW
,
EXP
GsCfgMod
(decimal)
MANT
GsCfgCW
,
MANT
GsCfgMod
(decimal)
8
9
5
10
11
3
6
12
13
7
14
4
15
8
9
5
10
11
6
12
13
R
S(ref)
(
Ω
)
0
1
2
3
0
1
0
0
2
1
0
0
1
0
0
3
2
1
0
0
1
-
-
-
-
1
1
2
1
1
3
2
1
1
2
1
3
1
2
2
3
2
2
3
2
2
0.0652
0.0580
0.0541
0.0522
0.0474
0.0467
0.0450
0.0435
0.0401
0.0386
0.0373
0.0350
0.0348
0.0338
0.0300
0.0280
0.0270
0.0246
0.0234
0.0225
0.0208
1.0000
0.5217
0.5000
0.3333
0.2703
0.2609
0.2500
0.2000
0.1739
0.1667
0.1429
0.1402
0.1351
0.1304
0.1250
0.1111
0.1043
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