NXP Semiconductors I2C Bus AN11022 Manuale utente

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)

NXP Semiconductors

AN11022

CLRC663 Quickstart Guide

AN11022

All information provided in this document is subject to legal disclaimers.

Application note

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Rev. 1.1 — 12 July 2012

205911

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Contact information

For more information, please visit: http://www.nxp.com

For sales office addresses, please send an email to: salesaddresses@nxp.com

Revision history

Rev

Date

Description

1.1

20120712

Some Figures updated because of quality reasons, Section Licenses updated

1.0

20120216

Initial release

NXP Semiconductors

AN11022

CLRC663 Quickstart Guide

AN11022

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Application note

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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

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CLRC663 Quickstart Guide

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PMU

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

MOSI

ADR1

IF1(SCL) I/O SCK SCL SCL

IF2 I/O Tx MISO ADR2 SDA

IF3-SDA SDA Trigger NSS SDA ADR2

IFSEL0

IFSEL1

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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