CLRC663 Datasheet, PDF (42/132 Pages) NXP Semiconductors – Contactless reader IC

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.
CLRC663
Product data sheet
COMPANY PUBLIC
READER IC
(DIGITAL)
SIGIN
SIGOUT
SIGOUT
SIGIN
READER IC
(ANTENNA)
001aam307
Fig 29. Block diagram of the active Antenna concept
The Table 30 and Table 31 describe the necessary register configuration for the use case
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
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).
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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