CRX14-MQ/XX [STMICROELECTRONICS]

Low Cost 13.56MHz / IC Short Range Contactless Coupler Chip with anti-collision, CRC management and anti-clone function; 低成本的13.56MHz / IC短距离非接触耦合器芯片，防碰撞， CRC管理和防克隆功能


型号：	CRX14-MQ/XX
厂家：	ST
描述：	Low Cost 13.56MHz / IC Short Range Contactless Coupler Chip with anti-collision, CRC management and anti-clone function 低成本的13.56MHz / IC短距离非接触耦合器芯片，防碰撞， CRC管理和防克隆功能
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CRX14

Low Cost 13.56MHz / I²C Short Range Contactless Coupler Chip

with anti-collision, CRC management and anti-clone function

DATA BRIEFING

FEATURES SUMMARY

■ Single 5V ±500mV Supply Voltage

■ SO16N package

Figure 1. Packages

■ External Oscillator

– 13.56MHz Quartz

– 32.768kHz Quartz with Frequency Multiplier

■ Contactless Communication

– 13.56MHz Carrier Frequency

– ISO 14443B - 2 Air Interface Compliant

– ISO 14443B - 3 Frame Format Compliant

– Support Frame Answer with/without SOF/

EOF

SO16 (MQ)

150 mil width

– CRC generation and check

– France Telecom Proprietary Anti-Clone

Function

– Automated ST anti-collision exchange

■ I²C Communication

– Two Wire I²C Serial Interface

– Supports 400 kHz Protocol

– 3 Chip Enable pin

– Up to 8 CRX14 connected on the same bus

June 2002

1/4

Complete data available under NDA.

CRX14

SUMMARY DESCRIPTION

The CRX14 is a contactless coupler, compliant

with the short range ISO14443B standard control-

led, using the two wire I²C bus.

authentication capability and to build a system with

a high level of security at low cost.

Table 1. Signal Names

The CRX14 generates a 13.56MHz signal on an

external antenna. Transmitted data are modulated

using Amplitude Shift Keying (ASK) modulation.

Received data are demodulated from the tag load

variation signal, generated on the antenna, using

Bit Phase Shift Keying (BPSK) coding of an

847kHz sub-carrier. The Transmitted ASK wave is

10% modulated. The Data transfer rate between

the CRX14 and the tag is 106Kbit/s in both trans-

mission and reception modes.

RF OUT

RF IN

Antenna Output Driver

Antenna Input Filter

Power Supply & Ground

Ground for RF circuitry

Oscillator input

VCC / GND

GND_RF

OSC1 /

OSC2

PLL_RC

Vref

PLL RC filter Input

Transmitter Reference Voltage

13.56MHz/32.768kHz osc select

Reset

The CRX14 follows the ISO 14443 part 2 type B

recommendation for the radio-frequency power

and signal interface.

OSC_SEL

RESET

SCL

Figure 2. Logic Diagram

I²C Clock

SDA

I²C Bi-Directional Data

I²C Chip Enable

CRX14

Vref

I²C Chip Enable

OSC_SEL

RF OUT

Antenna

RF IN

I²C Chip Enable

Transmitter

OSC1

OSC2

PLL_RC

RESET

Figure 3. SO Connections

I C

SCL

SDA

CRX14

Bus

RAM

Contr- Buffer

oller

Receiver

Vref

RF IN

RF OUT

GND_RF

OSC1

GND

GND_RF

OSC2

AI06828

RESET

PL_RC

GND

OSC_SEL

SCL

The CRX14 targets short range applications which

need disposable or secure and re-usable prod-

ucts. The CRX14 includes an automated anti-col-

lision mechanism that allows it to detect and select

tags present at the same time within range of the

CRX14. The anti-collision is based on the STMi-

croelectronics probabilistic scanning methodolo-

gy. The CRX14 provides an anti-clone function

from FRANCE TELECOM which allows tag au-

thentication. With the use of the single chip cou-

pler CRX14, it is easy to design a reader with the

SDA

AI06827

The CRX14 provides a complete analog interface,

compliant with the ISO/IEC 14443 recommenda-

tions for a radio-frequency power and signal inter-

face. It allows the ISO 14443-2 type B proximity

tag to be powered and to have control data trans-

mitted, via a simple antenna. The CRX14 is fabri-

cated with STMicroelectronics High Endurance

Single Polysilicon CMOS technology.

2/4

CRX14

The CRX14 is organized in four blocks:

on the antenna by the load variation of the con-

tactless tag. The resulting signal is decoded by

a 847KHz BPSK (binary phase shift keying)

sub-carrier decoder.

– The I²C bus controller handles the serial con-

nection with the application host. It is compliant

with the 400kHz I²C bus specification and it con-

trols the read/write access to all the CRX14 reg-

isters.

The CRX14 is designed to be connected to a dig-

ital host (Microcontroller or ASIC) which has to

manage all the communication protocol in both

transmit and receive mode through the I²C serial

bus.

– The RAM buffer is bi-directional. It stores all the

request frame bytes to be transmitted to the tag

and all received bytes send by the tag on the an-

swer frame.

– The transmitter powers all the contactless tags,

within range, by generating a RF magnetic field

at 13.56MHz on an external antenna. The field

is 10% modulated using ASK (amplitude shift

keying) modulation for outgoing data.

CRX14 DEVICE OPERATION

The CRX14 chip coupler provides four volatile reg-

isters. They control all the behaviour of the device

and are described in Table 2.

– The receiver demodulates the signal generated

Table 2. CRX14 Control Registers

I2C Address

Access

Purpose

Set parameter register

00h

01h

Parameters register

Read parameter register

Store and send request frame to the tag.

Store tag answer frame

Input/Output frame register

Transfer register content to Host

Start the Authenticate process

02h

03h

Authenticate register

Slot Marker register

Get the Authenticate status

Launch the automated anti-collision process

Not Applicable. Return data FFh.

PART NUMBERING

For a list of available options (speed, package,

etc.) or for further information on any aspect of this

device, please contact your nearest ST Sales Of-

fice.

Table 3. Ordering Information Scheme

Example:

CRX14

–

Device Type

CRX14

Package

MQ = SO16 (150 mil width)

Customer Code

XX = Given by the issuer

3/4

CRX14

Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences

of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted

by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject

to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not

authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics.

The ST logo is registered trademark of STMicroelectronics

All other names are the property of their respective owners

STMicroelectronics group of companies

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India - Israel - Italy - Japan - Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States.

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4/4

CRX14-MQ/XX [STMICROELECTRONICS]

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