MFRC522 datasheet(63/96 Pages) NXP

63 / 96 page

MFRC522_33

Product data sheet

PUBLIC

Rev. 3 — 26 October 2009

112133

63 of 96

NXP Semiconductors

MFRC522

Contactless reader IC

9.3.4.8

VersionReg register

Shows the MFRC522 software version.

9.3.4.9

AnalogTestReg register

Determines the analog output test signal at, and status of, pins AUX1 and AUX2.

Table 130. AutoTestReg register bit descriptions

Bit

Symbol

Value Description

reserved

reserved for production tests

AmpRcv

internal signal processing in the receiver chain is performed

non-linearly which increases the operating distance in communication

modes at 106 kBd

Remark: due to non-linearity, the effect of the RxThresholdReg

non-linear

5 to 4

RFT

reserved for production tests

3 to 0

SelfTest

[3:0]

enables the digital self test

the self test can also be started by the CalcCRC command; see

Section 10.3.1.4 on page 68

the self test is enabled by 1001b

Remark: for default operation the self test must be disabled by 0000b

Table 131. VersionReg register (address 37h); reset value: xxh bit allocation

Bit

Symbol

Version[7:0]

Access

Table 132. VersionReg register bit descriptions

Bit

Symbol

Description

7 to 0

Version[7:0]

indicates current software version of the MFRC522

Remark: the current version of the MFRC522 is 90h or 91h

Table 133. AnalogTestReg register (address 38h); reset value: 00h bit allocation

Bit

Symbol

AnalogSelAux1[3:0]

AnalogSelAux2[3:0]

Access

R/W

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