PDF PCF7941 Data sheet ( Hoja de datos )

Número de pieza	PCF7941
Descripción	Security Transponder and RISC Controller
Fabricantes	Philips
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No Preview Available ! www.DataSheet4U.com Philips Semiconductors Product Profile Preliminary Information PCF7941 Security Transponder and RISC Controller, STARC lite Features General Description • Compatible with Security Transponder, PCF7936AS. • RISC Programmable Keyless Entry features • 384 Bit EEPROM The PCF7941 is a single chip high performance Security Transponder and Keyless Entry controller, ideally suited for vehicle immobilizer applications that incorporate keyless entry functions. • 16-Pin SO package Transponder • 64/32 bit mutual authentication calculation unit The transponder circuitry is compatible with the Security Transponder PCF7936AS, for use in mixed systems that employ a STARC and a standard Security Transponder, PCF7936AS, at the same time. • 32 bit unique device identification number • 4t 8 bit Secre Key The Transponder circuitry meets the security and performance requirements of modern car immobilizer • Fast mutual authentication (39 ms) • EEPROM read/write protection capability • E5xcellent sensitivity in read and write mode (3 µT) applications. Excellent device sensitivity and short authentication time ensure outstanding system performance. The Transponder circuitry does not require any battery supply and full operation is granted in a Keyless Entry battery low RISC Controller • Advanced 8-bit RISC architecture • 4 Kbyte ROM, 64 Byte RAM condition. The RISC Controller circuitry is powered by an advanced low power 8-Bit RISC. The device features 11 I/O ports including up to four wake-up inputs for command button sensing. • O<n-chip RC oscillator ( ±10%) • Short instruction execution time (as fast as 1µs) Code hopping generation may employ the transponder Calculation Unit, while telegram transmission characteristics • 11 I/O ports, general purpose are controlled by the RISC. If the same security algorithm is • Code hopping based on transponder calculation unit applied for the Transponder and the Code Hopping function, • Code hopping synchronization via transponder www.DataSheet4U.com• Clock input to serve as external data rate reference separate Secret Keys are provided to ensure independent code characteristics. Contactless code hopping synchronization may be accomplished via the conatctless • Programmable battery low detection interface. • Low power consumption (300 µA, PD 300 nA) • Single battery cell operation (2.1V to 5.5V) • Device supply can be derived from LF Field The system timing is derived from a low tolerant on-chip RC- Oscillator. If desired, an external data rate reference clock may be applied for use with common PLL transmitter devices. Typical Application optional VDD VBAT PCF7941 P15 (XCLK) P17 (DOUT) Security Transponder RISC Controller P16 (XON) Transmitter IR or UHF (PLL) IN1 EEPROM 384 Bit Calculation Unit Timer Modulator Interrupt Control P14 (LED) P20 User P21 Extensions P22 P13 (B3) IN2 Control Logic RC Oscillator P12 (B2) P11 (B1) P10 (B0) Power Management VSS Buttons Li 3V November 1999 DataSheet4 U .com www.DataSheet4U.com 1 page

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