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Remote keyless entry
ICs for remote keyless entry
Our transponder ICs provide the ideal solution for integrating remote keyless entry functionality into car immobilizer applications. Two RKE transponder products are currently available.
HITAG 2+ (PCF 7946) meets the security and performance requirements of modern car immobiliser applications, delivering excellent device sensitivity and short authentication times to ensure easy application and outstanding system performance. The transponder circuitry is fully compatible to the HITAG transponder, does not require a battery supply and provides full immobilizer functionality even under battery-low conditions.
The remote control circuitry features low power consumption to ensure long battery lifetime. The device supports up to four user buttons and an LED, for transmission acknowledgement, with code hopping performed upon each button press. The device also features automatic re-synchronisation of the rolling code, via the transponder interface.
The PCF 7942 STARC (Security Transponder and RISC Core) incorporates a microcontroller, based on a RISC architecture, enabling programmable RKE features. This device is compatible with the HITAG2 (PCF7936) transponder stick and HITAG 2PLUS (PCF 7946) RKE Transponder.
Product Overview
| Type number | PCF7942 |
PCF7946AT |
|---|---|---|
| Features | ||
| Compatible with PCF7936AS security transponder | Yes |
Yes |
| Keyless entry features | RISC programmable |
Rolling code generator |
| Package | SO16 |
SO14 |
| 64/32 bit mutual authentication calculation unit | Yes |
Yes |
| 32 bit unique device identification number | Yes |
Yes |
| 48 bit secret key | Yes |
Yes |
| Fast mutual authentication (39 ms) | Yes |
Yes |
| User memory (EEPROM) | 4 kbit |
128 bit |
| EEPROM read/write protection capability | Yes |
Yes |
| Excellent sensitivity in read / write mode (35 µT) | Yes |
Yes |
To download technical documentation click here