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MFRC522 数据表(PDF) 63 Page - NXP Semiconductors |
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MFRC522 数据表(HTML) 63 Page - NXP Semiconductors |
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63 / 96 page  MFRC522_33 © NXP B.V. 2009. All rights reserved. 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 7 reserved - reserved for production tests 6 AmpRcv 1 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 register’s MinLevel[3:0] and the CollLevel[2:0] values is also 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 7 6 5 4 3 2 1 0 Symbol Version[7:0] Access R 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 7 6 5 4 3 2 1 0 Symbol AnalogSelAux1[3:0] AnalogSelAux2[3:0] Access R/W R/W |
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