PCF7946AT

www.DataSheet4U.com Philips Semiconductors Product Profile Security Transponder plus Remote Keyless Entry, HITAG2PLUS Features Compatible with Security Transponder, PCF7936AS. Rolling Code Generator for keyless entry 14-pin SO package Transponder 64/32 bit mutual authentication 32 bit unique device identification number Fast authentication, 39ms 48 bit Secret Key 128 bit user memory (EEPROM) EEPROM read/write in cipher mode EEPROM read/write protection capability Excellent sensitivity in read and write mode Code Hopping Generator Four user buttons (15 + 1 commands) LED acknowledgment of transmission 42 bit unidirectional code hopping 48 bit Remote Secret Key 114 bit message with run-in, device identification, function code, terminator and parity bits Automatic code synchronisation via transponder Programmable data rate and frame repetition rate Clock input to support external data rate reference Manchester encoding General Description 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 circuitry meets the security and performance requirements of modern car immobiliser applicati...