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CLRC663 Datasheet(PDF) 37 Page - NXP Semiconductors |
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CLRC663 Datasheet(HTML) 37 Page - NXP Semiconductors |
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37 / 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 37 of 132 NXP Semiconductors CLRC663 Contactless reader IC 8.6 Analog interface and contactless UART 8.6.1 General The integrated contactless UART supports the external host online with framing and error checking of the protocol requirements up to 848 kbit/s. An external circuit can be connected to the communication interface pins SIGIN and SIGOUT to modulate and demodulate the data. The contactless UART handles the protocol requirements for the communication schemes in co-operation with the host. The protocol handling itself generates bit- and byte-oriented framing and handles error detection like Parity and CRC according to the different contactless communication schemes. The size, the tuning of the antenna, and the supply voltage of the output drivers have an impact on the achievable field strength. The operating distance between reader and card depends additionally on the type of card used. 8.6.2 TX transmitter The signal delivered on pin TX1 and pin TX2 is the 13.56 MHz carrier modulated by an envelope signal for energy and data transmission. It can be used to drive an antenna directly, using a few passive components for matching and filtering, see Section 14 “Application information”. The signal on TX1 and TX2 can be configured by the register DrvMode, see Section 9.8.1 “TxMode”. The modulation index can be set by the TxAmp. Following figure shows the general relations during modulation Note: When changing the continuous wave, the residual carrier also changes, while the modulation index remains the same. Fig 25. General dependences of modulation 001aan355 time influenced by set_clk_mode envelope TX ASK100 1: Defined by set_cw_amplitude. 2: Defined by set_residual_carrier. TX ASK10 (1) (2) |
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