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MFRC523 Datasheet(PDF) 58 Page - NXP Semiconductors

Part No. MFRC523
Description  Contactless reader IC
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Maker  NXP [NXP Semiconductors]
Homepage  http://www.nxp.com
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MFRC523 Datasheet(HTML) 58 Page - NXP Semiconductors

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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 — 5 March 2010
115233
58 of 98
NXP Semiconductors
MFRC523
Contactless reader IC
9.2.3.6
RFCfgReg register
Configures the receiver gain.
9.2.3.7
GsNReg register
Defines the conductance of the antenna driver pins TX1 and TX2 for the n-driver when the
driver is switched on.
Table 97.
RFCfgReg register (address 26h); reset value: 48h bit allocation
Bit
7
6
5
4
3
2
1
0
Symbol
reserved
RxGain[2:0]
reserved
Access
-
R/W
-
Table 98.
RFCfgReg register bit descriptions
Bit
Symbol
Value
Description
7
reserved
-
reserved for future use
6 to 4
RxGain
[2:0]
defines the receiver’s signal voltage gain factor:
000
18 dB
001
23 dB
010
18 dB
011
23 dB
100
33 dB
101
38 dB
110
43 dB
111
48 dB
3 to 0
reserved
-
reserved for future use
Table 99.
GsNReg register (address 27h); reset value: 88h bit allocation
Bit
7
6
5
4
3
2
1
0
Symbol
CWGsN[3:0]
ModGsN[3:0]
Access
R/W
R/W
Table 100. GsNReg register bit descriptions
Bit
Symbol
Description
7 to 4
CWGsN
[3:0]
defines the conductance of the output n-driver during periods without
modulation which can be used to regulate the output power and
subsequently current consumption and operating distance
Remark: the conductance value is binary-weighted
during soft Power-down mode the highest bit is forced to logic 1
value is only used if driver TX1 or TX2 is switched on
3 to 0
ModGsN
[3:0]
defines the conductance of the output n-driver during periods without
modulation which can be used to regulate the modulation index
Remark: the conductance value is binary weighted
during soft Power-down mode the highest bit is forced to logic 1
value is only used if driver TX1 or TX2 is switched on


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