Product Summary

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.
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.
The Transponder circuitry meets the security and performance requirements of modern car immobilizer 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 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.
Code hopping generation may employ the transponder Calculation Unit, while telegram transmission characteristics are controlled by the RISC. If the same security algorithm is applied for the Transponder and the Code Hopping function,
separate Secret Keys are provided to ensure independent code characteristics. Contactless code hopping synchronization may be accomplished via the conatctless interface.
The system timing is derived from a low tolerant on-chip RCOscillator. If desired, an external data rate reference clock
may be applied for use with common PLL transmitter devices.

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Features

Compatible with Security Transponder, PCF7936AS.
RISC Programmable Keyless Entry features
384 Bit EEPROM
16-Pin SO package

Image Part No Mfg Description Data Sheet Download Pricing
(USD)
Quantity
PCF7941ATSM2AB120,
PCF7941ATSM2AB120,

NXP Semiconductors

RFID Transponder SECURITY TRANSPONDR RISC CONTROLLER

Data Sheet

0-605: $2.16
605-1000: $1.82
1000-2000: $1.73
PCF7941ATSM2AB1204
PCF7941ATSM2AB1204

NXP Semiconductors

RF Wireless Misc REMOTE KEYLESS ENTRY

Data Sheet

0-605: $2.16
605-1000: $1.82
1000-2000: $1.73
PCF7941XTT/C2AB370
PCF7941XTT/C2AB370


IC REMOTE KEYLESS ENTRY 20TSSOP

Data Sheet

0-2500: $1.73
PCF7941ETT/M2AB300
PCF7941ETT/M2AB300

NXP Semiconductors

RF Wireless Misc REMOTE KEYLESS ENTRY

Data Sheet

0-1790: $1.82
1790-2000: $1.73
PCF7941ATTM2AB1200
PCF7941ATTM2AB1200

NXP Semiconductors

RF Wireless Misc REMOTE KEYLESS ENTRY

Data Sheet

0-1790: $1.82
1790-2000: $1.73
PCF7941ATT/3601/2A
PCF7941ATT/3601/2A

NXP Semiconductors

RF Wireless Misc PCF7941ATT/TSSOP20/REEL13360

Data Sheet

Negotiable 
PCF7941ATS/3391/2A
PCF7941ATS/3391/2A

NXP Semiconductors

RF Wireless Misc PCF7941ATS/SSOP20/REEL133391

Data Sheet

Negotiable