CLRC663 Datasheet, PDF (120/132 Pages) NXP Semiconductors – Contactless reader IC

NXP Semiconductors
CLRC663
Contactless reader IC
14. Application information
A typical application diagram using a complementary antenna connection to the CLRC663
is shown in Figure 36.
The antenna tuning and RF part matching is described in the application note Ref. 1 and
Ref. 2.
MICRO-
PROCESSOR
VDD PVDD TVDD
8
25
18
AVDD
9
RXN
13
PDOWN
21
host
interface
READER IC
28-31
IRQ
32
VMID
14
TX1
17
16 ^TVSS
TX2
15
CRXN
R1 _Cvmid
L0
L0
DVDD ₇
14
12 ^RXP
33 19
20
VSS XTAL1
XTAL2
27.12 MHz
R3
CRXP
R2
C1
C0
C0
C1
R4
Ra
C2
C2
Ra
antenna
Lant
Fig 36. Typical application antenna circuit diagram
001aam269
14.1 Antenna design description
The matching circuit for the antenna consists of an EMC low pass filter (L0 and C0), a
matching circuitry (C1 and C2), and a receiving circuits (R1 = R3, R2 = R4, C3 = C5 and
C4 = C6;), and the antenna itself. The receiving circuit component values needs to be
designed for operation with the CLRC663. A reuse of dedicated antenna designs done for
other products without adaptation of component values will result in degraded
performance.
For a more detailed information about designing and tuning the antenna please refer to
the relevant application notes:
• MICORE reader IC family; Directly Matched Antenna Design, Ref. 1 and
• MIFARE (14443A) 13.56 MHz RFID Proximity Antennas, Ref. 2.
14.1.1 EMC low pass filter
The MIFARE system operates at a frequency of 13.56 MHz. This frequency is generated
by a quartz oscillator to clock the CLRC663 and is also the basis for driving the antenna
with the 13.56 MHz energy carrier. This will not only cause emitted power at 13.56 MHz
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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