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MFRC522 数据表(PDF) 24 Page - NXP Semiconductors |
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MFRC522 数据表(HTML) 24 Page - NXP Semiconductors |
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24 / 96 page  MFRC522_33 © NXP B.V. 2009. All rights reserved. Product data sheet PUBLIC Rev. 3 — 26 October 2009 112133 24 of 96 NXP Semiconductors MFRC522 Contactless reader IC [1] X = Do not care. The following abbreviations have been used in Table 15 and Table 16: • RF: 13.56 MHz clock derived from 27.12 MHz quartz crystal oscillator divided by 2 • RF_n: inverted 13.56 MHz clock • GSPMos: conductance, configuration of the PMOS array • GSNMos: conductance, configuration of the NMOS array • pCW: PMOS conductance value for continuous wave defined by the CWGsPReg register • pMod: PMOS conductance value for modulation defined by the ModGsPReg register • nCW: NMOS conductance value for continuous wave defined by the GsNReg register’s CWGsN[3:0] bits • nMod: NMOS conductance value for modulation defined by the GsNReg register’s ModGsN[3:0] bits • X = do not care. Remark: If only one driver is switched on, the values for CWGsPReg, ModGsPReg and GsNReg registers are used for both drivers. Table 16. Register and bit settings controlling the signal on pin TX2 Bit Tx1RFEn Bit Force 100ASK Bit Tx2CW Bit InvTx2RFOn Bit InvTx2RFOff Envelope Pin TX2 GSPMos GSNMos Remarks 0X[1] X[1] X[1] X[1] X[1] X[1] X[1] X[1] not specified if RF is switched off 10 0 0 X[1] 0 RF pMod nMod - 1 RF pCW nCW 1X[1] 0 RF_n pMod nMod 1 RF_n pCW nCW 10 X[1] X[1] RF pCW nCW conductance always CW for the Tx2CW bit 1X[1] X[1] RF_n pCW nCW 10 0 X[1] 0 0 pMod nMod 100 % ASK: pin TX2 pulled to logic 0 (independent of the InvTx2RFOn/Inv Tx2RFOff bits) 1 RF pCW nCW 1X[1] 0 0 pMod nMod 1 RF_n pCW nCW 10 X[1] X[1] RF pCW nCW 1X[1] X[1] RF_n pCW nCW |
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