Product Description


General Description

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. Transponder PCF7935 suitable

for various models of Alfa Romeo, BMW, Mini, Mercedes Benz,

Peugeot, Citroen, Opel Vauxhall, Mitsubishi, Volkswagen,

Audi, Seat, Skoda, Ford, Mazda, Volvo, Nissan, Chery,

Saipa and many others.