PCF7946AT

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 PCF7946AT circuitry meets the security and performance requirements of modern car immobiliser applications. Excellent device sensitivity PCF7946AT (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 of PCF7946AT a low power consumption to ensure long battery lifetime. The PCF7946AT 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 PCF7946AT 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 of PCF7946AT are configurable by the on-chip EEPROM.

The HITAG2PLUS features a clock input as an externaldata rate reference of PCF7946AT for use with common PLL transmitter devices.