Please see detailed below a selection of datasheets and remote control programming instructions for the accompanying transponders and remotes that we sell. The technical documents are directly from some of the worlds leading semi-conductor manufacturers.

PCF7946 - The HITAG2PLUS is a high performance monolithic Security Transponder and Remote Keyless Entry Chip ideally suited for car immobiliser applications that incorporate keyless entry functions. The HITAG2PLUS transponder circuitry is compatible with the Security Transponder PCF7936AS to support mixed systems using a HITAG2PLUS and a standard Security Transponder, PCF7936AS at the same time.

The Transponder circuitry meets the security and performance requirements of modern car immobiliser applications. Excellent device sensitivity (large distance) and short authentication time ensure easy application and outstanding system performance. The Transponder circuitry does not require any battery supply and full operation is granted in a Keyless Entry battery low condition.

The Remote Control circuitry features a low power consumption to ensure long battery lifetime. The device supports up to four user buttons and a LED for transmission acknowledgment. Code hopping upon each button press is provided. The device features automatic re-synchronisation of the rolling code via the transponder interface.

The Transponder and rolling code algorithm employ the same security algorithm for easy system integration on the receiver side. Separate Secret Keys are provided to ensure independent code characteristics. Data rate, modulation and repetition rates of the remote transmission frame are configurable by the on-chip EEPROM.
 

PCF7936 is a Security transponder for automotive immobiliser applications where the transponder has to identify itself towards the basestation as an authorized device.

The Security Transponder derives its power supply from the magnetic field (LF field) established by the basestation. No additional battery supply is needed. Data is transmitted by modulating the LF field.The Security Transponder features secure contactless authentication, employing a Secret Key and a random number in order to cipher any communication between the device and the basestation.

The secure contactless authentication is ideally suited for vehicle immobilization applications. In addition, the device features a factory programmed unique serial number that also serves as product type identification.If desired, the device may be operated as a Read/write transponder with access control by password or as a Read Only transponder.