CLRC663 Datasheet, PDF (37/132 Pages) NXP Semiconductors – Contactless reader IC

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
influenced by set_clk_mode
envelope
TX ASK100
TX ASK10
(1)
(2)
1: Defined by set_cw_amplitude.
2: Defined by set_residual_carrier.
time
001aan355
Fig 25. General dependences of modulation
Note: When changing the continuous wave, the residual carrier also changes, while the
modulation index remains the same.
CLRC663
Product data sheet
COMPANY PUBLIC
All information provided in this document is subject to legal disclaimers.
Rev. 3.3 — 3 April 2012
171133
© NXP B.V. 2012. All rights reserved.
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