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 ■ External Oscillator Figure 1. Packages – 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 Function Proprietary 16 1 SO16 (MQ) 150 mil width Anti-Clone – 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 Complete data available under NDA. 1/4 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 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 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 CRX14 VCC Vref OSC_SEL OSC1 OSC2 PLL_RC RESET SCL SDA E0 E1 E2 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 Oscillator input PLL_RC PLL RC filter Input Vref Transmitter Reference Voltage OSC_SEL 13.56MHz/32.768kHz osc select RESET Reset SCL I²C Clock SDA I²C Bi-Directional Data E0 I²C Chip Enable E1 I²C Chip Enable E2 I²C Chip Enable RF OUT Transmitter Figure 3. SO Connections I2C Bus RAM Contr- Buffer Receiver oller Antenna CRX14 RF IN GND GND_RF 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-collision is based on the STMicroelectronics probabilistic scanning methodology. The CRX14 provides an anti-clone function from FRANCE TELECOM which allows tag authentication. With the use of the single chip coupler CRX14, it is easy to design a reader with the 2/4 authentication capability and to build a system with a high level of security at low cost. Vref RF IN E0 E1 E2 RESET PL_RC GND 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 VCC RF OUT GND_RF OSC1 OSC2 OSC_SEL SCL SDA AI06827 The CRX14 provides a complete analog interface, compliant with the ISO/IEC 14443 recommendations 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. CRX14 on the antenna by the load variation of the contactless tag. The resulting signal is decoded by a 847KHz BPSK (binary phase shift keying) sub-carrier decoder. The CRX14 is organized in four blocks: – The I²C bus controller handles the serial connection with the application host. It is compliant with the 400kHz I²C bus specification and it controls the read/write access to all the CRX14 registers. The CRX14 is designed to be connected to a digital 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 answer 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 registers. 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 00h 01h 02h 03h Access Purpose W Set parameter register R Read parameter register W Store and send request frame to the tag. Store tag answer frame R Transfer register content to Host W Start the Authenticate process R Get the Authenticate status W Launch the automated anti-collision process R Not Applicable. Return data FFh. Parameters register Input/Output frame register Authenticate register Slot Marker register 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 Office. Table 3. Ordering Information Scheme Example: CRX14 – MQ / XX 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. 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