NXP Semiconductors I2C Bus AN11022 User manual

AN11022
CLRC663 Quickstart Guide
Rev. 1.1 —
12 July 2012
205911
Application note
COMPANY PUBLIC
Document information
Info
Content
Keywords
RC663, Reader IC, Power Supply, Interfacing RC663, RC663 Quick start
up, Functional description, Register settings
Abstract This document describes the required basic circuitry to operate the
RC663 and it also describes how to set up first communication using the
RC663 Design-In Board (Demo Board V 3_0)

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AN11022
CLRC663 Quickstart Guide
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Contact information
For more information, please visit: http://www.nxp.com
For sales office addresses, please send an email to: [e-mail]
Revision history
Rev
Date
Description
1.1
20120712
Some Figures updated because of quality reasons, Section Licenses updated
1.0
20120216
Initial release

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AN11022
CLRC663 Quickstart Guide
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1. Introduction
This document describes the basic requirements to power up the reader IC. This
application note does not replace the CLRC663 datasheet. Please refer to the datasheet
to read more information on each chapter. This document also gives an overview of the
RC663 evaluation reader board and describes the function and first steps of using the
board and the RC663. For this Application Note Version 3.0 of the 663 reader board is
used.
2. General description of the RC663
The RC663’s overall functionality can be separated into three functions:
1. Generate the RF field: The generated magnetic field has to be maximized within the
limits of the transmitter supply current, general emission limits and requirements to
protocol standards.
2. Transmit data: The coded and modulated data signal has to be transmitted in a way,
that all supported card standards are able to receive it. The signal shape and timing
according to relevant standards has to be considered.
3. Receive data: The response of a card or NFC passive device has to be transferred
to the differential or single sided receive input of the RC663 considering various
limits, e.g. maximum voltage and receiver sensitivity.
In the following chapters the general wiring just like the power supply concept, interface
selection and so on is described.

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CLRC663 Quickstart Guide
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2.1 Basic wiring
The basic wiring diagram can be found in Fig 1.
The matching procedure of the antenna
can be found in the application note AN11019 (Ref. 2).
Fig 1. Basic wiring diagram
It is recommended that Input pins which are not used be tied to a defined electrical
potential.
Output pins can be floating.
2.2 Power supply concept
The CLRC663 is supplied by VDD - Supply voltage, PVDD- pad supply and TVDD- Tx
power supply. These three voltages are independent and can have different as well as
the same supply voltage values. e.g. to operate with a 3.3 V supplied Microcontroller,
PVDD and VDD shall be 3.3 V, to guarantee maximum field strength TVDD shall be 5V.
Voltages between 3 V to 5.5 V can be applied to VDD, PVDD and TVDD.
Independent of the voltage it is recommended to buffer these supplies with blocking
capacitors. VDD and PVDD min 100 nF; TVDD min 100 nF parallel to 1 uF
NOTE: AVDD and DVDD are not Voltage inputs! Buffer them with blocking
capacitances of 470 nF each.
470 nF
470 nF

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CLRC663 Quickstart Guide
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PMU
TX
TX1
TX2
TVSS
PD V-Regulators 1.8V
HPD
Control
VDD
DVDD
TVDD
AVDD
Fig 2. Power supply diagram
2.3 Interface selection
The CLRC663 supports direct interfacing of various hosts as the SPI, I2C, I2CL and serial
UART interface type. The CLRC663 resets its interface and checks the current host
interface type automatically having performed a Power-On or Hard Reset. The CLRC663
identifies the host interface by the means of the logic levels on the control pins after the
Reset Phase. This is done by a combination of fixed pin connections IF1SEL0 and
IF1SEL1. The following table shows the different configurations:
Table 1. Connection Scheme for detecting the different Interface Types
UART
SPI
I2C
I2C-L
IF0
I/O
Rx
MOSI
ADR1
ADR1
IF1(SCL) I/O SCK SCL SCL
IF2 I/O Tx MISO ADR2 SDA
IF3-SDA SDA Trigger NSS SDA ADR2
IFSEL0
I
0
0
1
1
IFSEL1
I
0
1
0
1
PDOWN

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CLRC663 Quickstart Guide
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2.4 Crystal oscillator
The clock applied to the CLRC663 acts as a time basis for generation of the carrier sent
out at TX, for the quadrature mixer I and Q clock generation, and for the coder and
decoder of the synchronous system. Therefore, stability of the clock frequency is an
important factor for proper performance. To obtain highest performance, clock jitter has
to be as small as possible. This is best achieved by using the internal oscillator buffer
with the recommended circuitry.
Fig 3. Crystal connection
Table 2. Crystal requirements recommendations
Symbol Parameter min Typ max Unit
fxtal Crystal frequency 27.12 MHz
∆fxtal
Crystal frequency accuracy
-250
+250
ppm
ESR Equivalent series resistant 50 100 Ω
CL Load capacitance 10 pF
Pxtal Crystal power dissipation 50 100 uW
2.5 Receiver circuit
The Receiver is a fully differential circuit and can be used double ended or single
ended:
For single ended

use (Quasi- Differential) of the receiver circuit it is strongly
recommended to connect RxN and RxP to each other or to connect them by
using the Rcv_Reg register (address 38h).But if the Rcv_Rx_single bit in the
Rcv_Reg register is set to 1 -> Quasi-Differential, the unused Rx pin has to
be open and not connected to Ground.
For double ended
use connect RxN and RxP, as recommended, to the
transmitter circuit, directly after the EMC filter.

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CLRC663 Quickstart Guide
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3. Hardware design of the RC663 evaluation board (“red board”)
3.1 Scope
This part describes the functionality of the evaluation reader based on the RC663. It
includes the functional and electrical specifications and gives the needed details to use
this reader as a reference design.
This reader implementation is based on the HVQFN33 package (body 5 x 5 x 0.85 mm).
The RC663 itself is described in the corresponding data sheet (see reference [1]).
3.2 Features
•Single 7.5 V external power supply
•RS232 DSUB9 connector for easy connection to a host PC
•RS232 Serial UART up to 1228.8 kBd, with voltage levels dependent on pin voltage
supply
•Supports transfer speed communication up to 848 kbit/s with credentials
•I/O pins (GPIO0/SIGIN; SIGOUT)
•Hard Power Down
•Standby mode
•Programmable and cascadable timers
•FiFo buffer handles 512 byte send and receive
•IntegerN PLL providing clock for standard microcontroller used frequencies
•Low power card detection
•Integrated Free-Running Low Power Oscillator
•Digital test signal pins CLKOUT,SIGOUT,TCK,TDI,TDO,TMS
•versatile quadrature receiver architecture with fully differential receiver
•Antenna size: 113 mm x 77 mm

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CLRC663 Quickstart Guide
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3.3 Functional description
The RC663 evaluation reader is a contactless smartcard reader based on the RC663
reader IC.
The Reader PCB is divided into 2 Parts, the general reader part and The Antenna and
matching part:
Table 3. PCB sections
PCB Section Description
General reader part
(Fig 5 lower figure) Includes Power supply, Rs232 Interface and RC663 related part also EMC filter for TX circuit
Antenna and matching part
(Fig 5 lower figure) Antenna matching (without EMC filter) with fully differential receiver circuit and PCB antenna coil
The reader has one drawn cutline between EMC filter and matching circuit. This is to cut
the antenna and the antenna related matching from the reader (Fig 4). Seven vias have
been added to connect another Antenna with matching to the evaluation reader.
Fig 4. RC663 board version 3.0

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CLRC663 Quickstart Guide
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3.4 PCB Marking and major improvements to older version
There are two versions of the RC663 board version 2.0 and version 3.0
The latest version is:
NXP
RC663 Board V3.0
The difference is shown below (
Fig 5)
Improvements form V 2.0 to V 3.0:
Adding a Cutline to separate the general reader part from the Antenna and
matching part
Analog debug pins are outlined
Adding pins for current measurement on TVDD
Prepared for adding another antenna with matching

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CLRC663 Quickstart Guide
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NXP RC663 Board V2.0
NXP RC663 Board V3.0
Fig 5. NXP RC663 Board V2.0 and 3.0

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CLRC663 Quickstart Guide
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3.5 Schematic description
The following parts describe the RC663 evaluation reader board schematic, the part list,
and the layout of the PCB completely in order to give the user the possibility to take the
evaluation reader as a reference design for contactless smartcard reader integration.
3.6 Interface section
3.6.1 Power supply
Fig 6. Power supply circuit
The power supply can be connected with a 2.5 mm dc plug. The polarity of the plug is
managed automatically on the PCB. The supplied voltage should be in a range of 7.5 V
to 12.0 V and can be unregulated. The power supply should be able to provide at least
250 mA.
The main supply voltage at TVDD and PVDD is 5 V.
The Core supply Voltage at AVDD and DVDD is 1.8 V.
After plugging the voltage supply, the LED on the PCB should light up.

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CLRC663 Quickstart Guide
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3.6.2 RS232 Host interface
Fig 7. RS232 interface and transceiver
The DSUB-9 socket is used for a standard RS232 connection to the PC.
For this interface the following values are assembled:
Table 4. Used devices for RS232 interface
Device
Value
C1 1 μF
C6 1 μF
C7 220 nF
C8
1 μF
C9 1 μF
R3
Not assembled
R9 0 Ω

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CLRC663 Quickstart Guide
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Table 5. DSUB-9 Pinning for RS232
Pin
Signal
D
Voltage
1 DCD (Data Carrier Detect) O ± 3 – 12 V
2 RD (Receive Data) O ± 3 – 12 V
3 TD (Transmit Data) I ± 3 – 12 V
4 DTR (Data Terminal Ready) I ± 3 – 12 V
5 GND Pwr
6 DSR (Data Set Ready) O ± 3 – 12 V
7 RTS (Ready To Send) I ± 3 – 12 V
8 RTS (Ready To Send) O ± 3 – 12 V
9 RI (IRQ) O ± 3 – 12 V

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CLRC663 Quickstart Guide
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3.6.3 Microcontroller interface type
The CLRC663 supports direct interfacing of various hosts as the SPI, I2C, I2CL and
serial
UART interface type. The CLRC663 resets its interface and checks the current host
interface type automatically having performed a Power-On or Hard Reset. The CLRC663
identifies the host interface by the means of the logic levels on the control pins after the
Reset Phase. This is done by a combination of fixed pin connections. The Table 1 on
page 5 shows the different configurations.
3.6.4 USB-RS232 adapter
The development boards make use of a serial RS232 interface which is connected to a
PC to execute scripts or other PC based software to control the functionality of the
contactless reader IC.
More and more it is found that modern PC’s are not equipped by default with the RS232
interface.
A standard interface available on most PCs is the USB interface. USB to serial
converters convert the signals of a USB interface to RS232 signals are available in the
market.
In practice we have found that not all USB /RS232 converters are working without
problems. The reason for this problem could be that the designers of this interface need
to find a compromise to fit most applications, so that it does not fit very well to the use
case of transferring contactless data.
To avoid this problem more information’s about RS232 to USB converter and the right
configuration can be found in AN11116 (“Using the RS232 serial evaluation boards on a
USB port”) on CLRC 663 web page.

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CLRC663 Quickstart Guide
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3.6.5 RC663 schematic
This part shows a short overview of the RC336 schematic with all connections and also
the oscillator part of the evaluation reader.
Fig 8. RC663 Schematic
Table 6. Used devices for RC663 Schematic including oscillator
Device
Value
R1 / R2 47 kΩ
Quarz EPSON TOYOCOM - FA-128, 27.120000 MHZ, +-15PPM -
QUARZ ,FA-128,27.120000 MHZ,+-15PPM
C12 12 pF

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3.6.6 Antenna circuit
The Transceiver circuit is divided into 3 Parts: the Antenna, Matching Circuit, and EMC
Filter. The matching part of the transceiver circuit is responsible for the matching
resistance of the whole Tx circuit. To tune your Antenna to the target resistance C1 and
C2 have to be adjusted. For more information’s about Antenna design and Tuning see
AN11019 (“CLRC Antenna Design Guide”) and AN78010 (“13.56 MHz RFID Proximity
Antennas”).
Fig 9. Antenna and transceiver circuit

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Fig 10. Schematic of the Antenna and Transceiver circuit
Table 7. Used devices for RC663 Schematic including oscillator
Device Value
RqR7 / R8
Damping Resistors for Q limitation 4,7 Ω
C2
C25 12 pF
C26 12 pF
C35 150 pF
C36 150 pF
C1
C2 10 pF
C18 10 pF
C21 22 pF
C30 18 pF
C45 18 pF
C46 22 pF
EMC
L1
470 nH
WE-MK 0.47uH 200mA, manufacturer Würth Elektronik;
manufacturer. part-nr. 74479032
L2
470 nH
WE-MK 0.47uH 200mA, manufacturer Würth Elektronik;
manufacturer. part-nr. 74479032
C24 56 pF
C27 68 pF
C47 56 pF

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Device Value
C48 68 pF
Receiver
circuit
R12 15 kΩ
R13 15 kΩ
R17 n.A.
R20 n.A.
C19 100 nF
C20 1 nF
C41 1 nF
R10 1 kΩ
R18 1 kΩ

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3.7 PCB description and functionality
3.7.1 Top layer and placing
Fig 11. Top layer RC663 board

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Fig 12. Parameter Selection Placement Top Layer