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CRX14 Datasheet(PDF) 5 Page - STMicroelectronics |
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CRX14 Datasheet(HTML) 5 Page - STMicroelectronics |
5 / 40 page 5/40 CRX14 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 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 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 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 tech- nology. 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 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 RFOUT Antenna Output Driver RFIN Antenna Input Filter OSC1 Oscillator Input OSC2 Oscillator Output E0, E1, E2 Chip Enable Inputs SDA I²C Bi-Directional Data SCL I²C Clock VCC Power Supply GND Ground VREF Transmitter Reference Voltage GND_RF Ground for RF circuitry AI06828B RFOUT CRX14 RFIN OSC1 SCL SDA E0 E1 E2 GND GND_RF VCC VREF Antenna OSC2 |
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