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CLRC663 Datasheet(PDF) 42 Page - NXP Semiconductors |
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CLRC663 Datasheet(HTML) 42 Page - NXP Semiconductors |
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42 / 132 page  CLRC663 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved. Product data sheet COMPANY PUBLIC Rev. 3.3 — 3 April 2012 171133 42 of 132 NXP Semiconductors CLRC663 Contactless reader IC 8.6.4 Active antenna concept Two main blocks are implemented in the CLRC663. A digital circuitry, comprising state machines, coder and decoder logic and an analog circuitry with the modulator and antenna drivers, receiver and amplification circuitry. For example, the interface between these two blocks can be configured in the way, that the interfacing signals may be routed to the pins SIGIN and SIGOUT. The most important use of this topology is the active antenna concept where the digital and the analog blocks are separated. This opens the possibility to connect e.g. an additional digital block of another CLRC663 device with a single analog antenna front-end. The Table 30 and Table 31 describe the necessary register configuration for the use case active antenna concept. The interface between these two blocks can be configured in the way, that the interfacing signals may be routed to the pins SIGIN and SIGOUT (see Figure 30 “Overview SIGIN/SIGOUT Signal Routing”). This topology supports, that some parts of the analog part of the CLRC663 may be connected to the digital part of another device. The switch SigOutSel in registerSigOut can be used to measure signals. This is especially important during the design In phase or for test purposes to check the transmitted and received data. However, the most important use of SIGIN/SIGOUT pins is the active antenna concept. An external active antenna circuit can be connected to the digital circuit of the CLRC663. SigOutSel has to be configured in that way that the signal of the internal Miller Coder is sent to SIGOUT pin (SigOutSel = 4). SigInSel has to be configured to receive Manchester signal with sub-carrier from SIGIN pin (SigInSel = 1). Fig 29. Block diagram of the active Antenna concept Table 30. Register configuration of CLRC663 active antenna concept (DIGITAL) Register Value (binary) Description SigOut.SigOutSel 0100 TxEnvelope Rcv.SigInSel 10 11 Receive over SigIn (ISO/IEC14443A) Receive over SigIn (Generic Code) DrvCon.TxSel 00 Low (idle) Table 31. Register configuration of CLRC663 active antenna concept (Antenna) Register Value (binary) Description SigOut.SigOutSel 0110 0111 Generic Code (Manchester) Manchester with Subcarrier (ISO/IEC14443A) Rcv.SigInSel 01 Internal DrvCon.TxSel 10 External (SigIn) RxCtrl.RxMultiple 1 RxMultiple on 001aam307 SIGIN SIGIN SIGOUT SIGOUT READER IC (DIGITAL) READER IC (ANTENNA) |
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