DEMOKITCRX14 STMicroelectronics, DEMOKITCRX14 Datasheet - Page 5

• Manufacturer Part Number: DEMOKITCRX14
• Description: RFID EVALUATION KIT ISO14443-B
• Manufacturer: STMicroelectronics
• Type: Development kitr

Specifications of DEMOKITCRX14

• Contents: CD-ROM, CRX14 Board, USB Transceiver, Samples and Documentation
• Processor To Be Evaluated: CRX14
• Interface Type: I2C
• Operating Supply Voltage: 5 V
• For Use With/related Products: CRX14
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 497-3704

SUMMARY DESCRIPTION
The CRX14 is a contactless coupler that is compli-
ant with the short range ISO14443 type-B stan-
dard. It is controlled using the two wire I²C bus.
The CRX14 generates a 13.56MHz signal on an
external antenna. Transmitted data are modulated
using Amplitude Shift Keying (ASK). Received
data are demodulated from the PICC (Proximity in-
tegrated Coupling Card) load variation signal, in-
duced on the antenna, using Bit Phase Shift
Keying (BPSK) of a 847kHz sub-carrier. The
Transmitted ASK wave is 10% modulated. The
Data transfer rate between the CRX14 and the
PICC is 106 Kbit/s in both transmission and recep-
tion modes.
The CRX14 follows the ISO14443 type-B recom-
mendation for Radio frequency power and signal
interface.
The CRX14 is specifically designed for short range
applications that need disposable, or secure and
re-usable, products.
The CRX14 includes an automated anti-collision
mechanism that allows it to detect and select any
ST short range memories that are present at the
same time within its range. The anti-collision
mechanism is based on the STMicroelectronics
probabilistic scanning method.
The CRX14 provides an anti-clone function, from
FRANCE
authentication of the ST short range memories.
Using the CRX14 single chip coupler, therefore, it
is easy to design a reader, with authentication ca-
pability and to build an end application with a high
level of security at low cost.
The CRX14 provides a complete analog interface,
compliant
recommendations for Radio-Frequency power
and signal interfacing. With it, any ISO14443 type-
B PICC products can be powered and have their
data transmission controlled via a simple antenna.
The CRX14 is fabricated in STMicroelectronics
High Endurance Single Poly-silicon CMOS tech-
nology.
The CRX14 is organized as 4 different blocks (see
Figure
The I²C bus controller. It handles the serial
connection with the application host. It is
compliant with the 400kHz I²C bus
specification, and controls the read/write
access to all the CRX14 registers.
The RAM buffer. It is bi-directional. . It stores
all the request frame Bytes to be transmitted to
the PICC, and all the received Bytes sent by
the PICC on the answer frame.
The transmitter. It powers the PICCs by
generating a 13.56MHz signal on an external
3.):
TELECOM,
with
the
which
ISO14443
allows
type-B
the
The CRX14 is designed to be connected to a digi-
tal host (Microcontroller or ASIC). This host has to
manage the entire communication protocol in both
transmit and receive modes, through the I²C serial
bus.
Figure 2. Logic Diagram
Table 1. Signal Names
RF
RF
OSC1
OSC2
E0, E1, E2
SDA
SCL
V
GND
V
GND_RF
CC
REF
OSC1
antenna. The resulting field is 10% modulated
using ASK (amplitude shift keying) for
outgoing data.
The receiver. It demodulates the signal
generated on the antenna by the load variation
of the PICC. The resulting signal is decoded
by a 847kHz BPSK (binary phase shift keying)
sub-carrier decoder.
OUT
IN
SDA
SCL
E0
E1
E2
Antenna Output Driver
Antenna Input Filter
Oscillator Input
Oscillator Output
Chip Enable Inputs
I²C Bi-Directional Data
I²C Clock
Power Supply
Ground
Transmitter Reference Voltage
Ground for RF circuitry
GND
V CC
CRX14
V REF
GND_RF
Antenna
RF OUT
RF IN
OSC2
AI06828B
CRX14
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