MFRC522 datasheet(56/96 Pages) NXP

56 / 96 page

MFRC522_33

Product data sheet

PUBLIC

Rev. 3 — 26 October 2009

112133

56 of 96

NXP Semiconductors

MFRC522

Contactless reader IC

9.3.3.6

RFCfgReg register

Conﬁgures the receiver gain.

9.3.3.7

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

Symbol

reserved

RxGain[2:0]

reserved

Access

R/W

Table 98.

RFCfgReg register bit descriptions

Bit

Symbol

Value

Description

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

Symbol

CWGsN[3:0]

ModGsN[3:0]

Access

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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