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CRX14

Overview:

The CRX14 is a contactless coupler that is compliant with the short range ISO14443 type-B standard. 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 integrated Coupling Card) load variation signal, induced 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 reception modes.

The CRX14 follows the ISO14443 type-B recommendation 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 TELECOM, which allows the authentication of the ST short range memories. Using the CRX14 single chip coupler, therefore, it is easy to design a reader, with authentication capability and to build an end application with a high level of security at low cost.

The CRX14 provides a complete analog interface, compliant with the ISO14443 type-B 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 technology.

The CRX14 is organized as 4 different blocks (see Figure 3.):

  • 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 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.

The CRX14 is designed to be connected to a digital host (Microcontroller or ASIC). This host has to manage the entire communication protocol in both transmit and receive modes, through the I²C serial bus

Feature Summary

  • Single 5V ±500mV Supply Voltage
  • SO16N package
  • Contactless Communication
    • ISO14443 type-B protocol
    • 13.56MHz Carrier Frequency using an External Oscillator
    • 106 Kbit/s Data Rate
    • 36 Byte Input/Output Frame Register
    • Supports 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 400kHz Protocol
    • 3 Chip Enable Pins
    • Up to 8 CRX14 Connected on the Same Bus

 

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Contact Us

Shanghai RealSmart Technologies Co., Ltd.

Rm 706,Bldg of Vorwerk, No.1768. Yishan Road, MinHang District, Shanghai 201103, P.R China

Tel: +86 21 6432 6941

Fax: +86 21 6432 6942

Email: contacts@rsmart.com.cn

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