SGS Thomson Microelectronics CRX14 Datasheet
CRX14
Low Cos t 13.5 6MHz / I²C Sh ort Range Conta ctle ss Coup ler Chip
with anti-collision, CRC management and anti-clone function
DATA BRIEFING
FEATURES SUMMARY
■ Single 5V ±500mV Supply Voltage
■ SO16N package
■ 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
– 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
Figure 1. Packages
16
1
SO16 (MQ)
150 mil width
June 2002
Complete data available under NDA.
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CRX14
SUMMARY DESCRIPTION
The CRX14 is a contactless coupler, compliant
with the short range ISO14443B standard 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) modulation.
Received data are demodulated from the tag load
variation signal, generated on the a ntenna, using
Bit Phase Shift Keying (BPSK) coding of an
847kHz sub-carrier. The Transmitted ASK wave is
10% modulated. The Data transfer rate bet ween
the CRX14 and t he t ag is 106Kbit/s in bot h transmission and reception modes.
The CRX14 follows the ISO 14443 part 2 type B
recommendation for the radio-frequency power
and signal interface.
Figure 2. Logic Diagram
authentication capability and to build a system with
a high level of security at low cost.
Table 1. Signal Names
RF OUT Antenna Output Driver
RF IN Antenna Input Filter
VCC / GND Power Supply & Ground
GND_RF Ground for RF circuitry
OSC1 /
OSC2
PLL_RC PLL RC filter Input
Vref Transmitter Reference Voltage
OSC_SEL 13.56MHz/32.768kHz osc select
RESET Reset
SCL I²C Clock
Oscillator input
OSC_SEL
OSC1
OSC2
PLL_RC
RESET
SCL
SDA
E0
E1
E2
CRX14
I2C
Bus
Contr-
oller
V
CC
RAM
Buffer
GND GND_RF
Vref
Transmitter
Receiver
RF OUT
Antenna
RF IN
AI06828
The CRX14 targets short range applications which
need disposable or secure and re-usable products. The CRX14 includes an automated anti-collision mechanism that allows it to detect and select
tags present at the same time within range of the
CRX14 . The anti-collisio n is ba sed on t he STM icroelectronics probabilistic scanning methodology. The CRX14 provides an anti-clone function
from FRANCE TELECOM which allows tag authentication. With the us e of the single chip coupler CRX14, it is easy to design a reader with the
SDA I²C Bi-Directional Data
E0 I²C Chip Enable
E1 I²C Chip Enable
E2 I²C Chip Enable
Figure 3. SO Connections
CRX14
Vref
RF IN
E1
E2
RESET
PL_RC
16
1
2
3
4
5
6
7
8
AI06827
15
14
13
12
11
10
9
V
CC
RF OUT
GND_RFE0
OSC1
OSC2
OSC_SEL
SCL
SDAGND
The CRX14 provides a complete analog interface,
compliant with the ISO/IEC 14443 recomm endations for a radio-frequency power and signal interface. It allows the ISO 14443-2 type B proximity
tag to be powered and to have control data transmitted, via a simple antenna. The CRX14 is fabricated with STMicroelectronics High Endurance
Single Polysilicon CMOS technology.
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