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| Philips Semiconductors Product Profile Security Transponder, SECT Features * * * * * * * * * * Programmable Security Transponder 48/48 bit challenge/response authentication Powerful security algorithm 128 bit Secret Key 32 bit device identification number 768 bit non-volatile user memory (EEPROM) EEPROM read/write protection capabilities Fully compatible with PCF7931/30 family 20 year EEPROM data retention Leadless stick shaped plastic package General Description PCF7935AS The PCF7935, SECT is a programmable Security Transponder employing challenge/response authentication ideally suited for contactless authentication and memory access between a basestation and the transponder. The SECT features a powerful security algorithm for vehicle immobiliser applications. The device is fully compatible with the PCF7931 read only and PCF7930 read/write transponder family, providing means for downward compatibility. The transponder features 1152 bit of non-volatile memory (EEPROM) from which 768 bit are reserved for user data storage. User data and configuration data may be exchanged in password mode for advanced pre-personalisation techniques. Memory access flags and a 56 bit password enable read and/or write protection of data. The SECT performs a 48 bit challenge/response authentication, employing a 128 bit Secret Key. In addition the SECT supports a 32 bit device identification number. The transponder power supply and system clock is derived from the magnetic component of the RF field generated by the basestation. The transponder is assembled in a small leadless stick shaped plastic package. Block Diagram PCF7935AS Stick Package Outline 11,9-12,1 A Contactless Interface Rectifier Voltage Limiter All Dimensions [mm] Control Logic Data Acqusition Power-On Reset EEPROM Access Control Clock Recovery 5,9-6,1 A L C Modulator Calculation Unit 4,4 - 4,6 4,9-5,1 1,9-2,1 Demodulator EEPROM Transponder IC June 1998 2,9-3,05 Cross Section A-A ( without Scale ) |
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