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MFRC522 Datasheet(PDF) 35 Page - NXP Semiconductors

Part # MFRC522
Description  Contactless Reader IC
PDF  109 Pages
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Manufacturer  NXP [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo NXP - NXP Semiconductors

MFRC522 Datasheet(HTML) 35 Page - NXP Semiconductors

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© NXP B.V. 2007. All rights reserved.
Product data sheet
Rev. 3.2 — 22 May 2007
35 of 109
NXP Semiconductors
MFRC522
Contactless Reader IC
9.2.3.6
RFCfgReg
Configures the receiver gain.
9.2.3.7
GsNReg
Selects the conductance for the N-driver of the antenna driver pins TX1 and TX2 when the
driver is switched on.
Table 83:
RFCfgReg register (address 26h); reset value: 48h
Bit
7
6
5
4
3
2
1
0
Symbol
-
RxGain
-
Access
Rights
RFU
r/w
RFU
Table 84:
Description of RFCfgReg bits
Bit
Symbol
Description
7
-
Reserved for future use.
6 to 4
RxGain
This register defines the receivers signal voltage gain factor:
Value
Description
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 for future use.
Table 85:
GsNReg register (address 27h); reset value: 88h
Bit
7
6
5
4
3
2
1
0
Symbol
CWGsN
ModGsN
Access
Rights
r/w
r/w
Table 86:
Description of GsNOnReg bits
Bit
Symbol
Description
7 to 4
CWGsN
The value of this register defines the conductance of the output N-driver
during times of no modulation. This may 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 1.
This value is only used if the driver TX1 or TX2 are switched on.
3 to 0
ModGsN
The value of this register defines the conductance of the output N-driver for
the time of modulation. This may 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 1.
This value is only used if the driver TX1 or Tx2 are switched on.



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